Southwire 500-ft 12 -AWG Green Solid Copper THHN wire (By-the-roll)

NEC-Mandated Equipment Grounding Color Southwire 12 AWG Green THHN: The Universal Equipment Grounding Conductor for Every Circuit in Conduit The Southwire 12 AWG green THHN 500 ft solid copper ground wire is the NEC-mandated equipment grounding conductor for residential, commercial, and industrial electrical circuits installed in conduit. Per NEC 250.119, green (or green with yellow stripe, or bare copper) is the ONLY permitted color for equipment grounding conductors. This makes green THHN the universal companion conductor pulled through every conduit installation alongside the hot and neutral conductors, and the highest-consumption single color in any electrical contractor’s inventory. Code-compliant for grounding circuits up to 60 amps per NEC 250.122 sizing tables. �� Free Nationwide Freight ⚡ NEC 250.119 Mandated Color ���� Trusted Southwire Brand ✅ UL Listed THHN/THWN-2 On this page Southwire 12 AWG green THHN key highlights Why green specifically: NEC 250.119 mandates the color Ground conductor sizing per NEC 250.122 12 AWG green grounds circuits up to 60 amps Universal application: every conduit installation Common applications for green THHN Equipment grounding vs grounding electrode conductors When bare copper is the alternative to green THHN What THHN is and how it differs from bare conductors Conduit fill calculations including the ground conductor Temperature rating and wet location use Southwire 12 AWG green THHN specifications Why IB Lighting Southwire 12 AWG green THHN FAQs Who this wire is built for Green THHN vs red, black, white THHN Installation best practices The Southwire 12 AWG green THHN 500 ft solid copper wire is the NEC-mandated equipment grounding conductor color used in every residential and commercial electrical circuit installed in conduit. As a 12 AWG green THHN wire, this product delivers the 20-amp circuit grounding capacity required for typical residential and small commercial circuits, plus the 30-amp and 60-amp circuit grounding capacity per NEC 250.122 sizing tables (which size the ground conductor by circuit breaker rating, not by the ungrounded conductor gauge). As green THHN ground wire, this conductor color is the ONLY code-compliant choice for insulated equipment grounding conductors in conduit per NEC 250.119, making it a universal companion conductor in every wire pull regardless of the circuit type or voltage. As a 12 AWG grounding conductor, the Southwire 12 AWG green THHN is appropriately sized for circuits served by breakers up to 60 amps, which covers most residential branch circuit and equipment circuit applications including 20A general circuits, 30A dryer/water heater circuits, 40A range circuits, and 50A larger range or smaller subpanel circuits. As green THHN 500 ft by the roll, the standard 500-foot spool length matches typical electrician inventory for active electrical installation work, with one roll typically serving more circuits than any other single color because grounding is required for every installation. Every Southwire 12 AWG green THHN 500 ft roll ships nationwide from IB Lighting with free freight. Manufacturer specifications are available at the official Southwire website. Southwire 12 AWG green THHN solid copper wire, the NEC-mandated equipment grounding conductor for every circuit in conduit. Southwire 12 AWG Green THHN Key Highlights Color NEC 250.119 Mandated Green Green insulation is the ONLY permitted color for insulated equipment grounding conductors per NEC 250.119. Not convention; actual code requirement. Universal Every Conduit Installation Every circuit pulled through conduit requires a green ground conductor. The highest-volume single color in electrical contractor inventory. Gauge 12 AWG Solid Copper 12 AWG solid copper conductor handles equipment grounding for circuits up to 60 amps per NEC 250.122 sizing tables. Range Grounds Up to 60A Circuits Per NEC 250.122, 12 AWG ground sizes the equipment grounding conductor for breakers up to 60 amps. Covers most residential and small commercial circuits. Type THHN / THWN-2 Dual Rated Dual-rated insulation: PVC primary under clear nylon outer jacket. Suitable for dry locations (THHN) and wet locations (THWN-2). Length 500 Foot Roll Standard electrician inventory roll size. Green THHN typically depletes faster than other colors because of universal application. Temperature 90C Rated 90C insulation rating handles high-temperature applications. Ampacity per 75C tables for typical residential/commercial use per NEC. Listed UL Listed UL Listed and manufactured to applicable NEC requirements for THHN/THWN-2 building wire. Inspector-ready for permitted installations. Why Green Specifically: NEC 250.119 Mandates the Color The Southwire 12 AWG green THHN is green for a specific and mandatory reason rooted in NEC code requirement. Understanding the difference between convention and mandate helps clarify why green THHN cannot be substituted with another color even when no other color would create electrical interference. NEC 250.119 specifically states that insulated equipment grounding conductors shall have a continuous outer finish that is either green or green with one or more yellow stripes. Bare copper conductors are also permitted. Any other color is a code violation. This rule applies universally to: Residential branch circuit grounds: Every grounded circuit must have its grounding conductor in green (or green with yellow stripe, or bare copper). Commercial and industrial grounds: Same requirement applies regardless of voltage or system size. Equipment bonding conductors: Bonding jumpers that connect equipment chassis to the grounding system follow the same color rule. Subpanel grounds: Equipment grounding conductors feeding subpanels must be green if insulated. The reason for the strict color mandate is safety. Equipment grounding conductors are the fault path that protects against ground-fault shock hazards. If a hot conductor accidentally contacts a metallic equipment chassis, the equipment ground provides a low-impedance path that returns the fault current to the panel, tripping the breaker before the chassis can become energized at a dangerous voltage. Misidentifying the ground conductor (by using the wrong color) creates the risk that someone troubleshooting the circuit later will connect the conductor incorrectly, defeating the safety function. The other NEC-mandated conductor colors: White or gray: Neutral conductor (NEC 200.6). Mandatory; no other color is permitted for neutral. Green, green with yellow stripe, or bare copper: Equipment grounding conductor (NEC 250.119). Mandatory; no other color is permitted. Any color other than white, gray, green, or green with yellow stripe: Ungrounded (hot) conductors. Multiple colors are permitted but black, red, and blue are conventional. The practical implication: in any conduit installation, the green THHN serves a unique role that no other color can fill. While red, black, blue, brown, and yellow can substitute for each other on hot conductor identification in some applications, green THHN cannot be substituted with anything other than bare copper or green-with-yellow-stripe insulated. Ground Conductor Sizing per NEC 250.122 One of the most commonly misunderstood aspects of equipment grounding conductors is the sizing rule. The Southwire 12 AWG green THHN handles more circuits than many electricians initially expect because NEC 250.122 sizes the equipment grounding conductor based on the circuit breaker rating, NOT on the ungrounded conductor (hot) ampacity. NEC 250.122 equipment grounding conductor sizing table (key residential and small commercial sizes): 15-amp circuit: Equipment ground requires 14 AWG copper minimum. 20-amp circuit: Equipment ground requires 12 AWG copper minimum (the Southwire 12 AWG green THHN handles this exactly). 30-amp circuit: Equipment ground requires 10 AWG copper minimum. The 12 AWG green THHN is undersized for 30A circuit grounds. 40-amp circuit: Equipment ground requires 10 AWG copper minimum. The 12 AWG green THHN is still undersized. 60-amp circuit: Equipment ground requires 10 AWG copper minimum. The 12 AWG green THHN is undersized. 100-amp circuit: Equipment ground requires 8 AWG copper minimum. 200-amp circuit: Equipment ground requires 6 AWG copper minimum. The practical takeaway: the Southwire 12 AWG green THHN is the correct equipment grounding conductor for 20-amp circuits ONLY. For circuits with breakers larger than 20 amps (30A dryer, 40A range, 50A larger range, 60A subpanel), 10 AWG green THHN is required at minimum. Many electricians instinctively assume the ground conductor must match the ungrounded conductor gauge (which would mean 10 AWG ground for 30A circuits using 10 AWG hots), but NEC 250.122 actually requires only 10 AWG ground for circuits up to 60 amps – the ground conductor is often smaller than the hot conductors at higher amperages. For typical residential installations: 15A and 20A general-purpose circuits: 12 AWG green THHN as the equipment ground (this product). 30A dryer/smaller water heater circuits: 10 AWG green THHN required as the equipment ground. 40A range circuits, 50A larger range circuits: 10 AWG green THHN minimum as the equipment ground. 60A small subpanel feeders: 10 AWG green THHN as the equipment ground. For grounding of circuits up to 20 amps, the Southwire 12 AWG green THHN is the right specification. For larger circuits, browse our broader IB Lighting electrical wire collection for the appropriate larger gauges of green THHN. 12 AWG Green THHN Grounds Circuits Up to 20 Amps The specific circuit range where the Southwire 12 AWG green THHN is the right equipment grounding conductor specification is 15-amp and 20-amp circuits. This covers the dominant residential circuit configurations. Typical 20-amp and smaller circuits requiring 12 AWG green THHN as the equipment grounding conductor: 20A general-purpose receptacle circuits: Kitchen countertop circuits, bathroom circuits, laundry circuits, and garage receptacles typically operate at 20A. 20A lighting circuits: Some residential lighting circuits are configured for 20A, particularly in larger homes or commercial applications. 15A general lighting circuits: Most residential bedroom and living area lighting circuits operate at 15A, with 12 AWG ground being the next larger size up from the minimum 14 AWG required. 20A AC condenser circuits: Smaller residential AC condensers (1.5-3.0 ton range) typically operate on 20A circuits. 20A workshop equipment circuits: Smaller workshop equipment at 240V/20A configurations. 20A commercial three-phase circuits: Commercial 277V LED lighting and small equipment at 20A. For each of these applications, the 12 AWG green THHN serves as the equipment grounding conductor in the conduit pull alongside the hot conductors (black for Phase A, red for Phase B on 240V circuits), neutral conductor (white when applicable), and the green ground (this product). Universal Application: Every Conduit Installation Needs Green THHN The most distinctive feature of green THHN compared to other conductor colors is the universal nature of its application. Every conduit installation, regardless of circuit type, voltage, or purpose, requires a grounding conductor in the conduit alongside the current-carrying conductors. This means green THHN consumption tracks the total volume of conduit installation work, not the volume of any specific circuit type. For an electrical contractor’s typical work mix: Every 120V circuit in conduit: Black hot white neutral green ground = 3 conductors. The green ground is required. Every 240V circuit in conduit: Black hot red hot white neutral (optional) green ground = 3-4 conductors. The green ground is required. Every commercial three-phase circuit: Black red blue white green = 5 conductors. The green ground is required. Every equipment grounding extension or bonding jumper: Single green conductor for grounding system improvements. This universal application makes green THHN the highest-consumption single color in any contractor’s inventory. While red THHN is consumed only on 240V circuit work and blue THHN is consumed only on three-phase commercial work, green THHN is consumed on every conduit installation regardless of type. For inventory planning: most electrical contractors maintain MORE green THHN inventory than any other single color. A typical contractor stocking ratio is approximately 2 to 3 rolls of green for every 1 roll of red, yellow, or blue, reflecting the universal application of green ground conductors. Common Applications for the Southwire 12 AWG Green THHN The Southwire 12 AWG green THHN serves residential and commercial 20-amp circuit grounding applications across nearly every installation type. Understanding the breadth of applications helps confirm the universal demand for green THHN inventory. Residential applications: Kitchen countertop receptacle circuits: 20A circuits serving kitchen countertop outlets per NEC small appliance circuit requirements. Bathroom circuits: 20A GFCI-protected circuits in residential bathrooms. Laundry circuits: Dedicated 20A circuits for laundry room receptacles. Garage receptacle circuits: 20A GFCI-protected circuits in residential garages. Outdoor receptacle circuits: 20A circuits feeding outdoor receptacles in conduit installations. Smaller AC condenser circuits: 1.5-3.0 ton residential AC condensers operating at 240V/20A. Commercial applications: 20A office receptacle circuits: General-purpose receptacles in commercial office spaces. 20A retail lighting and receptacle circuits: Retail space lighting and outlet circuits. Commercial three-phase 277V/20A lighting: LED lighting circuits in commercial buildings using three-phase service. Small equipment circuits in commercial spaces: Dedicated circuits for vending machines, refrigerators, point-of-sale equipment. Industrial applications: 20A control circuits: Industrial control circuits requiring isolated grounding. 20A instrument circuits: Process instrumentation and small motor circuits. Bonding jumpers: Equipment chassis bonding to the grounding system in industrial installations. For circuits larger than 20 amps, step up to 10 AWG green THHN (30-60A circuit ground), 8 AWG (100A), 6 AWG (200A), or larger as the breaker rating requires. Equipment Grounding vs Grounding Electrode Conductors Within electrical grounding systems, there are technically distinct conductor roles that the Southwire 12 AWG green THHN may or may not serve depending on the specific application. Understanding the distinction helps clarify code-compliant uses. Equipment grounding conductor (the primary application): Carries fault current from equipment chassis back to the source of supply during ground faults, allowing the overcurrent protection device to trip. Sized per NEC 250.122 based on circuit breaker rating. The Southwire 12 AWG green THHN serves this role for circuits with 20A breakers. Grounding electrode conductor (GEC): Connects the electrical service grounded conductor to the grounding electrode system (ground rods, water pipe, building steel, concrete-encased electrode). Sized per NEC 250.66 based on service entrance conductor size, NOT the circuit breaker. Typically requires larger gauges than this product for residential services. Main bonding jumper: Connects the grounded conductor (neutral) to the equipment grounding system at the main service panel. Sized per NEC 250.28 based on service entrance conductor size. Equipment bonding jumper: Various bonding applications connecting equipment to the grounding system. Sized variably per specific code sections. For typical residential and small commercial branch circuit installations, the Southwire 12 AWG green THHN serves the equipment grounding conductor role (the most common application). For service entrance grounding electrode conductors and main bonding jumpers in service equipment, larger gauges are typically required. When Bare Copper Is the Alternative to Green THHN NEC 250.119 permits equipment grounding conductors to be bare copper as an alternative to insulated green-jacketed conductors. Understanding when bare copper is preferred versus when insulated green THHN is required helps clarify the application boundaries. Bare copper equipment grounding conductors are common in: NM-B (Romex) cable assemblies: The ground conductor inside Romex is bare copper rather than insulated green. The cable jacket provides the protective coverage. UF-B underground feeder cables: Similarly, the ground inside UF-B is bare copper. SE (Service Entrance) and USE (Underground Service Entrance) cables: Often use bare conductors for grounding. Service entrance grounding electrode conductors: Often bare copper run from the service to grounding electrodes. Insulated green THHN equipment grounding conductors are required when: Conduit installations: Inside conduit, the ground conductor is typically insulated green THHN matching the other conductors. Bare conductors in conduit are permitted but less common. Wet locations: The insulation provides additional protection against corrosion in wet environments. Multi-circuit panels and junction boxes: Insulated ground conductors prevent accidental contact between grounds and ungrounded conductors when multiple circuits share a box. Commercial and industrial applications: Code or design standards typically specify insulated grounds in these environments. Bonding jumpers in panels: Where the bonding conductor passes near energized conductors. For typical conduit installations where the Southwire 12 AWG green THHN is the primary application, the insulated green specification provides cleaner installation, better identification, and improved protection compared to bare copper alternatives. What THHN Is and How Green THHN Specifically Fits THHN stands for Thermoplastic High Heat-resistant Nylon-coated. The Southwire 12 AWG green THHN delivers the same THHN/THWN-2 specification as all other Southwire THHN products, with the green insulation color identifying the conductor’s specific role as equipment ground. THHN/THWN-2 specifications applicable to all colors including green: Primary insulation: PVC (polyvinyl chloride) rated for 90C continuous operating temperature. Outer jacket: Clear nylon outer layer providing additional mechanical protection and chemical resistance. Conductor: Annealed copper, solid (single conductor strand) for smaller gauges including 12 AWG. Voltage rating: 600V for typical building wire applications. Wet location rating: THWN-2 dual rating allows installation in wet locations and underground conduit. Code compliance: NEC Article 310 (Conductors for General Wiring), Article 250 (Grounding and Bonding) for grounding-specific applications. The green color of the Southwire 12 AWG green THHN is integral to the insulation, not a surface coating that could wear off. The green pigment is incorporated into the PVC primary insulation during manufacturing, providing color identification that remains visible throughout the cable’s service life regardless of handling, environmental exposure, or aging. Conduit Fill Including the Ground Conductor When planning conduit installations, the green ground conductor counts toward the total conductor count for NEC conduit fill calculations. Understanding this helps ensure the conduit is appropriately sized for the complete conductor set. For typical 240V circuit conductor counts in conduit: 240V circuit with 120V loads (4 conductors): Black red white green = 4 conductors. Use 40% fill calculation. 240V-only circuit (3 conductors): Black red green = 3 conductors. Use 40% fill calculation (for 3 conductors). 120V circuit (3 conductors): Black white green = 3 conductors. Use 40% fill calculation. Multiple circuits in one conduit: Each circuit’s conductors plus a single equipment grounding conductor sized for the largest circuit (per NEC 250.122). Per NEC Chapter 9 Table 4 for 1/2-inch EMT conduit, the typical fill capacity for 12 AWG THHN conductors at 40% maximum fill (3 conductors) is approximately 9 conductors. For a typical 240V circuit requiring 4 conductors (red, black, white, green), 1/2-inch EMT provides comfortable fill capacity. For installations anticipating future conductor additions or multiple circuits in shared conduit, 3/4-inch EMT or larger provides additional capacity. For specific installations with multiple circuits sharing a single conduit, the equipment grounding conductor sizing follows NEC 250.122 based on the LARGEST circuit breaker in the shared conduit. A 1/2-inch conduit carrying both a 20A and a 30A circuit requires a 10 AWG green ground (sized for the 30A circuit), not separate ground conductors per circuit. Temperature Rating and Wet Location Use The Southwire 12 AWG green THHN carries the standard THHN 90C temperature rating with dual THWN-2 wet location rating, identical to other THHN colors. The temperature and location ratings apply equally regardless of conductor color. Practical implications for grounding installations: Wet location grounds: The THWN-2 rating allows the green THHN to be installed in wet location conduit including outdoor conduit, conduit through damp basements, and underground conduit. High-temperature applications: The 90C rating provides headroom for installations where multiple conductors share conduit and operate at elevated temperatures from ampacity loading. Industrial environments: Chemical resistance, mechanical durability, and temperature tolerance support industrial installations. For typical residential and commercial conduit installations, the Southwire 12 AWG green THHN’s specifications exceed the requirements of standard applications, providing margin for environmental variations and installation imperfections. Southwire 12 AWG Green THHN Specifications Southwire 12 AWG Green THHN Specifications Product Type THHN/THWN-2 Building Wire (Single Conductor) Brand Southwire Gauge 12 AWG Conductor Material Solid Copper Conductor Type Solid (single conductor strand) Insulation PVC Primary with Clear Nylon Outer Jacket Insulation Color Green (NEC 250.119 equipment grounding color) Length 500 ft Roll Voltage Rating 600V Temperature Rating 90C Ground Conductor Capacity 20-Amp Branch Circuit Grounds (per NEC 250.122) Location Rating Dry and Wet Locations (THHN/THWN-2 dual rated) Installation Inside Conduit, Raceway, or Equivalent Protective System Common Application Equipment Grounding Conductor for 20A Circuits in Conduit Code Compliance NEC Article 250 (Grounding and Bonding), Article 310 (Conductors) Certification UL Listed Master Electrician Led Why Buy the Southwire 12 AWG Green THHN from IB Lighting IB Lighting is a family-owned, nationwide reseller of electrical supplies, led by licensed Master Electrician Imad Boussi. Equipment grounding is the safety backbone of every electrical installation, and that Master Electrician expertise matters when contractors need to verify ground conductor sizing per NEC 250.122, plan grounding electrode systems, or troubleshoot grounding-related code compliance questions during inspection. Every Southwire 12 AWG green THHN 500 ft roll ships with free nationwide freight. Browse our complete electrical wire and cable collection for the broader range including companion Southwire 12 AWG red THHN for Phase B hot conductors, Southwire 12 AWG yellow THHN for alternative identification applications, consider Southwire 10/3 UF-B as direct-burial alternative for outdoor 240V circuits, or explore other Southwire products. Southwire 12 AWG Green THHN FAQs Why does the equipment grounding conductor have to be green? NEC 250.119 specifically mandates that insulated equipment grounding conductors must have a continuous outer finish that is either green or green with one or more yellow stripes. Bare copper conductors are also permitted. The rule is safety-critical: equipment grounding conductors are the fault path that trips the breaker during ground faults, and consistent color identification ensures the ground conductor is correctly identified during installation, maintenance, and troubleshooting. Substituting another color is a code violation. What circuit sizes use 12 AWG green THHN as the ground? Per NEC 250.122, 12 AWG green THHN is the correct equipment grounding conductor size for circuits with 20-amp breakers. This covers most residential and small commercial 20A applications: kitchen countertop circuits, bathroom circuits, laundry circuits, garage receptacles, outdoor receptacles, smaller AC condenser circuits, and 20A commercial circuits. For 30-amp or larger circuit breakers, 10 AWG green THHN is required at minimum per NEC 250.122 sizing table. Does the ground conductor have to match the hot conductor gauge? No. NEC 250.122 sizes the equipment grounding conductor by the circuit BREAKER rating, not by the ungrounded conductor gauge. This often means the ground conductor is SMALLER than the hot conductors. For a 30A circuit using 10 AWG hot conductors, the equipment ground is still 10 AWG (same gauge as hots, per the table). For a 60A circuit using 6 AWG hot conductors, the equipment ground is 10 AWG (smaller than hots). For a 100A circuit using 3 AWG hot conductors, the equipment ground is 8 AWG (significantly smaller than hots). The table determines the required ground size. Can I use bare copper instead of green THHN? In some applications yes, in others no. NEC 250.119 permits equipment grounding conductors to be bare copper as an alternative to insulated green-jacketed conductors. Bare copper is common in NM-B (Romex) cable, UF-B underground feeder cable, and some service entrance applications. Inside conduit, both bare copper and insulated green THHN are permitted, though insulated green is preferred because it prevents accidental contact with energized conductors in multi-circuit boxes and provides additional protection in wet locations. For typical conduit installations, insulated green THHN is the cleaner specification. Can I use 12 AWG green THHN as a hot conductor? No. Per NEC 250.119, the green color is reserved exclusively for equipment grounding conductors. Using green THHN as a hot conductor is a code violation regardless of how the cable is terminated or labeled. Hot conductors must be a color other than green, white, or gray. Black, red, blue, brown, yellow, and orange are all permitted hot conductor colors. The Southwire 12 AWG green THHN cannot be substituted for hot conductors even when other colors are unavailable. How many green THHN conductors do I need per circuit? For each separate circuit in a single conduit, one green equipment grounding conductor is required, sized per NEC 250.122 based on the circuit breaker rating. For multiple circuits sharing a single conduit, a SINGLE equipment grounding conductor sized for the LARGEST circuit in the shared conduit is acceptable (rather than separate grounds per circuit). For example, a conduit carrying one 20A circuit and one 30A circuit requires a single 10 AWG green ground (sized for the 30A circuit). Verify specific multi-circuit grounding configurations per current NEC. What is the difference between equipment ground and grounding electrode conductor? Equipment grounding conductors (this product’s application) provide the fault path between equipment and the source of supply, sized per NEC 250.122 based on breaker rating. Grounding electrode conductors (GECs) connect the electrical service grounded conductor to the grounding electrode system (ground rods, water pipe, etc.), sized per NEC 250.66 based on service entrance conductor size. The Southwire 12 AWG green THHN serves the equipment grounding conductor role; grounding electrode conductors for residential services are typically larger (often 6 AWG or 4 AWG for typical 200A residential services). Can the Southwire 12 AWG green THHN be used outdoors? Yes, when installed in approved outdoor conduit. The THHN/THWN-2 dual rating allows the conductor to be installed in PVC conduit, rigid metal conduit, or other approved outdoor raceway systems including underground conduit. The conduit provides physical protection against weather; the THWN-2 rating allows the conductor to operate in the wet conditions inside outdoor conduit. For direct-buried grounding without conduit, bare copper conductor is the typical alternative. Why do contractors stock more green THHN than other colors? Green THHN is the universal companion conductor for every conduit installation, while other colors are application-specific. Red THHN is consumed only on 240V circuit work; blue THHN is consumed only on three-phase commercial work; yellow THHN is consumed only on specialty identification applications. Green THHN is consumed on every circuit in conduit regardless of type. A typical contractor stocking ratio is approximately 2 to 3 rolls of green for every 1 roll of red, yellow, or blue, reflecting the universal application of green ground conductors. What does ‘THHN/THWN-2’ mean for green THHN? Both designations refer to the same physical wire. THHN means Thermoplastic High Heat-resistant Nylon-coated, rated for dry locations. THWN-2 means Thermoplastic Heat- and Water-resistant Nylon-coated, rated for both dry and wet locations at 90C. The Southwire 12 AWG green THHN carries the dual THHN/THWN-2 rating, which allows installation in either dry or wet conditions. The green insulation color identification applies regardless of which rating governs the specific installation. How long is the Southwire 12 AWG green THHN roll? The Southwire 12 AWG green THHN ships in 500-foot rolls (by-the-roll quantity). This length matches typical electrician inventory for active electrical installation work. Because green THHN is consumed on every conduit installation regardless of circuit type, the 500-foot roll typically depletes faster than other color rolls in the same inventory. For higher-volume contractors, multiple rolls or larger spool quantities may be appropriate. How long does shipping take from IB Lighting? Most Southwire 12 AWG green THHN 500 ft orders leave the warehouse within 1 to 2 business days and arrive at your address within 5 to 6 business days depending on destination. Every shipment travels with free freight. Tracking is provided as soon as the order is picked up by the carrier. Who the Southwire 12 AWG Green THHN Is Built For The Southwire 12 AWG green THHN serves the broadest buyer base of any THHN color because of the universal application of equipment grounding conductors. Every electrical contractor doing conduit installations consumes green THHN as part of normal operations. The primary buyer is the residential electrical contractor handling conduit installations for new construction, remodels, and major equipment circuit work. For these contractors, the Southwire 12 AWG green THHN is the equipment ground conductor for every 20-amp circuit they install, paired with appropriate hot and neutral conductors. The 500-foot roll matches typical contractor inventory pace. The secondary buyer is the commercial electrical contractor handling three-phase 277V/20A LED lighting circuits, general commercial 20A receptacle and lighting circuits, and small equipment circuits in commercial buildings. For these contractors, the 12 AWG green THHN is the ground conductor for every commercial 20A circuit in conduit. The tertiary buyer is the HVAC installer running AC condenser circuits and similar 240V mechanical equipment circuits. For these installers, the green THHN serves as the equipment ground in conduit pulls alongside red and black hots for 240V applications, providing the safety ground path for the equipment chassis. The quaternary buyer is the industrial maintenance electrician handling equipment circuits, control circuits, and instrumentation in manufacturing and process environments. For these electricians, the green THHN serves multiple roles including equipment grounds, bonding jumpers, and grounding system improvements. Browse the broader IB Lighting electrical wire collection for related products. Green THHN vs Red, Black, White THHN: The Unique Role Among the THHN color family, green THHN occupies a unique position. Other colors serve circuit-type-specific roles, while green serves a universal safety role across all installations. The complete THHN color comparison: Black THHN: Phase A hot conductor. Used on EVERY circuit (120V and 240V). Red THHN: Phase B hot conductor. Used on 240V circuits only. Blue THHN: Phase C hot conductor. Used on three-phase commercial circuits only. White THHN: Neutral conductor. Used on circuits with neutral (most 120V circuits; some 240V circuits). Green THHN (this product): Equipment grounding conductor. Used on EVERY conduit installation, EVERY circuit, EVERY application. Yellow, Brown, Orange THHN: Alternative identification colors. Used for specialty applications or alternative wiring system identification. For a typical 240V circuit pull, the four conductors are red, black, white, and green. Every one of these colors is required for the circuit to function and be code-compliant. None can be substituted with another color. The Southwire 12 AWG green THHN (this product) is the ground portion of this universal four-color set, joined by black for Phase A, red THHN for Phase B (compare with Southwire 12 AWG red THHN), and white for neutral. For comparison shoppers also browsing the yellow alternative identification color, browse the Southwire 12 AWG yellow THHN for those specialized applications. Installation Best Practices for the Southwire 12 AWG Green THHN Installing the Southwire 12 AWG green THHN follows standard practices for THHN conductor pulls through conduit, with grounding-specific considerations that ensure code-compliant safety performance. Always include the ground conductor: Every circuit in conduit requires an equipment grounding conductor. Verify the green THHN is included in every conductor pull before starting. Omitting the ground conductor creates a code violation and a safety hazard. Size the ground per NEC 250.122: Verify the ground conductor size matches the circuit breaker rating per the NEC table. For 20A circuits, 12 AWG green THHN (this product) is correct. For larger circuits, larger green THHN is required. Identify the ground at every termination: Strip the green THHN at terminations and connect to the equipment ground terminal at devices, the equipment ground bar at panels, and equipment chassis grounding lugs as required. Never connect the green ground to neutral terminals or hot terminals. Verify ground continuity: After installation, test the equipment grounding system for continuity from the source panel through the circuit to the equipment ground terminals. Use a continuity tester or multimeter to verify low-impedance ground path. Bond the ground bar at the source panel: Connect the green THHN equipment ground to the equipment grounding bar at the source panel. At main service panels, the equipment ground bar is bonded to the neutral bar via the main bonding jumper. At subpanels, the equipment ground bar is SEPARATE from the neutral bar per current NEC. Inspect connections during multi-circuit work: When multiple circuits share a conduit or junction box, verify each circuit’s hot conductors are correctly connected to their breakers and the green grounds all land on the equipment ground bar (not mixed with neutrals or hots). Test GFCI operation where applicable: For GFCI-protected circuits, verify the GFCI device operates correctly with the equipment grounding conductor properly connected. GFCI devices test ground-fault current return through the equipment ground path. Browse the complete IB Lighting electrical wire and cable collection, pair with companion Southwire 12 AWG red THHN for Phase B hot conductors on 240V circuits, compare with Southwire 12 AWG yellow THHN for alternative identification applications, consider Southwire 10/3 UF-B for direct-burial alternative to outdoor conduit installations, pair with a Tesla Universal Wall Connector for EV charging circuit installations, explore other Southwire products, or visit our customer FAQ hub. Manufacturer technical sheets are available at the official Southwire website. Ready to Order Southwire 12 AWG Green THHN? Equipment grounding conductor for residential remodel, commercial fit-out, or active contractor inventory? Talk to a Master Electrician-led team that knows NEC grounding requirements and conductor sizing. Call (800) 674-9019