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

The Universal Phase A Hot Conductor Southwire 12 AWG Black THHN: The Universal Hot Conductor for Every Circuit in Conduit The Southwire 12 AWG black THHN 500 ft solid copper hot wire is the universal Phase A conductor used in every residential, commercial, and industrial electrical circuit installed in conduit. Black is the conventional color for the primary hot leg of 120V and 240V circuits, making the Southwire 12 AWG black THHN the highest-consumption single color in any electrical contractor’s inventory. Every 120V branch circuit uses a black hot, every 240V circuit pairs a black hot with a red hot, and every three-phase commercial circuit starts with black for Phase A. Code-compliant hot conductor specification for 20-amp branch circuits across residential remodel, new construction, commercial fit-out, and industrial installations. �� Free Nationwide Freight ⚡ Universal Phase A Hot ���� Trusted Southwire Brand ✅ UL Listed THHN/THWN-2 On this page Southwire 12 AWG black THHN key highlights Why black is the primary hot conductor color NEC 210.5 hot conductor color convention Universal application: every circuit needs black Black white green: the standard 120V trio Black red green: the 240V trio Common applications for black THHN Three-phase commercial applications Why black is the highest-volume color Contractor stocking strategy for black THHN Conduit fill including the hot conductor Southwire 12 AWG black THHN specifications Why IB Lighting Southwire 12 AWG black THHN FAQs Who this wire is built for Black THHN vs red, white, green, yellow THHN Installation best practices The Southwire 12 AWG black THHN 500 ft solid copper wire is the universal Phase A hot conductor for residential and commercial electrical circuits installed in conduit. As a 12 AWG black THHN wire, this product delivers the 20-amp circuit capacity required for typical residential and small commercial branch circuit applications, with black insulation providing the conventionally-recognized primary hot conductor identification. As black THHN hot wire, this conductor color is the near-universal choice for the ungrounded (hot) conductor of 120V circuits and the first hot leg of 240V circuits, paired with red THHN for the second hot on 240V applications, white THHN for neutral, and green THHN for equipment grounding. As a 12 AWG hot conductor, the Southwire 12 AWG black THHN carries the supply current from the panel breaker to the load equipment at 120V (single-phase residential) or as one leg of the 240V split-phase configuration. As black THHN 500 ft by the roll, the standard 500-foot spool length matches typical electrician inventory pace, with black THHN typically depleting faster than any other single color because of its universal application across every circuit type installed in conduit. Every Southwire 12 AWG black THHN 500 ft roll ships nationwide from IB Lighting with free freight. Manufacturer specifications are available at the official Southwire website. Southwire 12 AWG black THHN solid copper wire, the universal Phase A hot conductor for every circuit in conduit. Southwire 12 AWG Black THHN Key Highlights Color Phase A Hot Conductor Black is the conventional color for the primary hot conductor in every residential and commercial electrical circuit installed in conduit. Universal Every Circuit Needs Black Every 120V circuit, every 240V circuit, and every three-phase circuit uses black as one of the hot conductors. The most universal color. Gauge 12 AWG Solid Copper 12 AWG solid copper conductor rated for 20-amp branch circuits. The dominant residential and small commercial circuit specification. 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. Black THHN typically depletes faster than any other single color due to universal application. Installation Conduit Pull Standard Designed for installation in electrical conduit, raceway, panels, and approved THHN applications. Not for direct burial without conduit. Temperature 90C Rated 90C insulation rating handles high-temperature applications. Ampacity per 75C tables for typical residential and 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 Black Is the Primary Hot Conductor Color Black is not NEC-mandated as the hot conductor color the way white is mandated for neutrals or green is mandated for equipment grounds. Black is a strong industry CONVENTION that has developed over decades of North American electrical practice. Understanding the difference between convention and mandate helps clarify why black THHN is so universally consumed despite not being a strict code requirement. NEC 210.5 permits any color EXCEPT white, gray, green, or green with yellow stripes for ungrounded (hot) conductors. This means the technically permissible colors for hot conductors include: Black: The near-universal convention for the primary hot conductor. Red: The convention for the second hot conductor on 240V circuits (Phase B). Blue: The convention for the third hot conductor on three-phase commercial circuits (Phase C). Brown, Orange, Yellow, Purple: Permitted colors sometimes used for specialty identification. Black became the convention for Phase A hot because of decades of consistent use in electrical wiring practices, training materials, industry publications, and manufacturer defaults. Every apprentice electrician learns “black is hot” as the first color association. Every electrical inspector expects black on the primary hot conductor. Every troubleshooting guide assumes black indicates the ungrounded conductor. The practical implication: while other colors are technically permitted for hot conductors, using anything other than black for the primary hot conductor creates unnecessary confusion during installation, inspection, and future maintenance. The Southwire 12 AWG black THHN is the industry-standard choice that every subsequent electrician working on the installation will expect to find on the hot terminal. The exception is multi-system applications: when a building has multiple voltage systems (for example, both 120V/240V single-phase and 208V/120V three-phase), NEC 210.5(C) requires distinguishing between the hot conductors of the different systems. In these applications, one system might use black/red for the primary/secondary hots, while the other system uses brown/orange/yellow. Even in these applications, one system almost always uses black for the primary hot to maintain the convention. NEC 210.5 Hot Conductor Color Convention NEC 210.5 governs the identification of ungrounded (hot) conductors. Understanding the code section helps clarify what is required versus what is conventional for hot conductor color. NEC 210.5(A) requires that ungrounded conductors NOT be white, gray, green, or green with yellow stripes (these colors are reserved for neutrals and equipment grounds per NEC 200.6 and 250.119). Beyond this restriction, any other color is technically permissible. NEC 210.5(C) requires that where multiple branch circuit systems supply the same premises (such as a building with both 120V/240V single-phase and 480V/277V three-phase systems), the ungrounded conductors of different systems must be distinguished either by color coding or by other approved means. The requirement ensures that electricians working on the building can identify which system a given conductor belongs to. For typical residential and small commercial installations with only one system, the conductor color choice is primarily conventional rather than mandatory. The industry conventions have developed as: 120V/240V single-phase (typical residential): Black for the primary hot (Phase A), red for the second hot (Phase B). This is the convention followed by nearly all residential installations. 208V/120V three-phase (small commercial): Black for Phase A, red for Phase B, blue for Phase C. This is the convention followed by most three-phase commercial installations up to 208V. 480V/277V three-phase (larger commercial): Brown for Phase A, orange for Phase B, yellow for Phase C in some applications. Or continuing the black/red/blue convention. Practices vary by region and design standard. For the typical residential and small commercial applications where the Southwire 12 AWG black THHN is most commonly consumed, black is the appropriate and expected choice for the primary hot conductor. The 500-foot roll matches the standard inventory pace for this dominant residential/commercial application. Universal Application: Every Circuit Needs Black THHN Unlike red THHN (which is consumed only on 240V circuit work) or blue THHN (which is consumed only on three-phase commercial work), the Southwire 12 AWG black THHN is consumed on essentially every conduit installation. Understanding this universal application clarifies why black is the highest-volume color in electrical contractor inventories. The Southwire 12 AWG black THHN role by circuit type: Every 120V branch circuit: Black hot white neutral green ground = 3 conductors. Black is the primary hot on every 120V circuit. Every 240V circuit (with neutral): Black hot red hot white neutral green ground = 4 conductors. Black is the first hot leg on every 240V circuit. Every 240V-only circuit (no neutral): Black hot red hot green ground = 3 conductors. Black is still the first hot leg. Every three-phase 208V/120V circuit: Black red blue hots white neutral green ground = 5 conductors. Black is Phase A. Every three-phase 480V/277V circuit: Convention varies but black is common for Phase A in many installations. Every multi-wire branch circuit (MWBC): Two hots on opposite phases (typically black and red) shared white neutral green ground. Black is one of the two hots. Every dedicated equipment circuit: Whatever the circuit type, black serves as the primary hot conductor. This universal application makes black THHN the highest-consumption single color in nearly any electrical contractor’s inventory. A typical contractor’s stocking ratio maintains approximately equal quantities of black and green THHN (both universal), with white running slightly behind (since 240V-only circuits skip the neutral), and other colors (red, blue, yellow, brown) at significantly lower ratios reflecting their circuit-type-specific applications. Black White Green: The Standard 120V Trio The most common circuit configuration in residential and commercial electrical work is the standard 120V branch circuit. Understanding the three-conductor set clarifies why the Southwire 12 AWG black THHN is consumed at such a high rate across every installation. The standard 120V circuit conductor set for residential and small commercial applications: One black THHN (this product): Phase A hot conductor. Connects to the 120V breaker at the panel and delivers 120V supply current to the load equipment. One white THHN: Neutral conductor. Connects to the neutral bar at the panel and provides the return current path from the load back to the panel. One green THHN (or bare copper): Equipment grounding conductor. Connects to the equipment ground bar at the panel and provides the safety fault path. For every 120V circuit installed in conduit, this three-conductor set is required. The Southwire 12 AWG black THHN (this product) provides the black hot conductor for the pull. Companion Southwire 12 AWG white THHN provides the neutral, and Southwire 12 AWG green THHN provides the equipment ground. Buying all three colors simultaneously from IB Lighting streamlines contractor procurement and ensures matched brand consistency across the installation. Every 12 AWG circuit in conduit uses this same three-color set for 120V applications. For typical residential circuits (kitchen countertop receptacles, bathroom circuits, laundry receptacles, garage receptacles, outdoor receptacles, general-purpose receptacles, lighting circuits), the black white green trio using 12 AWG conductors handles the 20-amp requirements. The same conductor set at larger gauges (10 AWG, 8 AWG, 6 AWG) handles higher-current 120V circuits. Black Red Green: The 240V Trio (Or Quartet) For 240V circuits, the Southwire 12 AWG black THHN pairs with red THHN as the second hot conductor. The specific conductor count depends on whether the connected equipment has 120V accessory loads. 240V-only circuits (three conductors): Black THHN (this product): Phase A hot, connects to one bus bar of the panel. Red THHN: Phase B hot, connects to the opposite bus bar of the panel. The 240V potential exists between these two hots. Green THHN: Equipment grounding conductor. 240V circuits with 120V accessory loads (four conductors): Black THHN (this product): Phase A hot. Red THHN: Phase B hot. White THHN: Neutral for the 120V accessory loads. Green THHN: Equipment grounding conductor. The Southwire 12 AWG black THHN handles the Phase A hot for 240V/20A applications. Common 20-amp 240V applications include air conditioning condensers in the 1.5 to 3.0 ton range, smaller water heaters with 120V controls, and some smaller workshop equipment. For higher-current 240V applications (electric ranges at 40-50A, dryers at 30A, EV chargers at 32-48A), larger gauge black THHN is required. Browse the broader IB Lighting electrical wire collection for larger gauges. For the second hot conductor on 240V circuits, pair the Southwire 12 AWG black THHN with the companion Southwire 12 AWG red THHN. The two products ship in the same 500-foot roll format and match the standard contractor 240V circuit installation workflow. Common Applications for the Southwire 12 AWG Black THHN Because the Southwire 12 AWG black THHN is consumed on every conduit installation, the application list is essentially the complete list of residential and commercial electrical circuits at 20-amp capacity. Understanding the breadth confirms the universal demand for black THHN inventory. Residential 120V applications: Kitchen countertop receptacle circuits: 20A small appliance circuits per NEC requirements. Bathroom GFCI circuits: 20A bathroom receptacle circuits requiring GFCI protection. Laundry receptacle circuits: Dedicated 20A laundry room circuits. Garage receptacle circuits: 20A GFCI-protected garage receptacles. Outdoor receptacle circuits: 20A weather-resistant GFCI receptacles in conduit installations. General-purpose receptacle circuits: Bedroom, living room, dining room 15A and 20A receptacles. Lighting circuits: 15A and 20A switched lighting circuits with white neutral and green ground companions. Smoke detector circuits: Hardwired interconnected 120V detector circuits. Residential 240V applications (paired with red THHN as second hot): Air conditioning condenser circuits: 1.5-3.0 ton residential condensers at 240V/20A. Small water heaters: Point-of-use water heaters at 240V/20A. Smaller workshop equipment: 240V/20A workshop tools and equipment. Some window AC units: Larger window units at 240V/20A. Commercial applications: 20A office and retail receptacle circuits: General-purpose commercial receptacles. Three-phase 208V/120V circuits: Black as Phase A of the three-phase commercial system. Commercial lighting circuits: 20A switched commercial lighting. Point-of-sale and small equipment circuits: Dedicated 20A commercial equipment circuits. For 30A, 40A, 50A, and larger circuits, step up to 10 AWG, 8 AWG, 6 AWG black THHN respectively. Three-Phase Commercial Applications The Southwire 12 AWG black THHN serves the Phase A role in three-phase commercial electrical systems, including 208V/120V wye systems common in small commercial buildings and 277V/480V systems in larger commercial installations. Three-phase electrical systems use three hot conductors (Phase A, Phase B, Phase C) plus a neutral (in wye configurations) and equipment ground. The Southwire 12 AWG black THHN typically serves the Phase A role in these systems, paired with red THHN for Phase B and blue THHN for Phase C. Common commercial three-phase applications for 12 AWG black THHN: 208V/120V wye system general receptacles: 20A commercial receptacle circuits where 208V single-phase (line-to-line) or 120V (line-to-neutral) is available. 277V commercial lighting circuits: LED lighting installations at 277V/20A using 12 AWG black as Phase A of the three-phase distribution. Small commercial equipment circuits: Point-of-sale terminals, kitchen equipment, HVAC controls, and similar 20A commercial loads. Retail lighting distribution: Track lighting, decorative lighting, and specialty commercial lighting on 20A circuits. For larger commercial three-phase circuits (30A and up), step up to 10 AWG or larger black THHN. The 12 AWG specification specifically matches 20-amp three-phase applications. Why Black THHN Is the Highest-Volume Color Understanding why the Southwire 12 AWG black THHN is the single highest-consumption color in electrical contractor inventories helps clarify the strategic value of buying in bulk or maintaining multiple rolls simultaneously. The math is straightforward: black THHN is used on every conduit installation regardless of circuit type. Compare this to other color usage patterns: Black THHN: Used on 100% of conduit circuits (every circuit needs a hot conductor). Green THHN: Used on 100% of conduit installations (every installation needs a ground). White THHN: Used on approximately 85% of circuits (most circuits have 120V loads requiring neutral; only pure 240V-only circuits skip the neutral). Red THHN: Used on approximately 25-40% of circuits (only 240V circuits use red). Blue THHN: Used on 5-15% of circuits (three-phase commercial only). Yellow, Brown, Orange THHN: Used on under 10% of circuits (specialty applications). For a typical residential electrical contractor with a diverse work mix (some 120V remodels, some 240V equipment installations, some new construction), the actual consumption pattern approximately matches these percentages. Green and black tie for the highest consumption rates, with white close behind. Red is the fourth-highest color, consumed on the specific 240V portion of work. The practical inventory implication: contractors should stock black and green THHN at ratios approximately 2 to 3 times higher than red, and 5 to 10 times higher than blue or other specialty colors. The 500-foot roll of Southwire 12 AWG black THHN typically depletes in a similar timeframe to the green THHN roll, with both requiring replacement more frequently than any other single color. Contractor Stocking Strategy for Black THHN Given black THHN’s universal consumption pattern, understanding the optimal stocking strategy helps contractors plan procurement to avoid running out mid-project while not tying up excessive capital in inventory. Recommended stocking strategy for the Southwire 12 AWG black THHN based on contractor size and work volume: Solo electrician or small contractor: Maintain 2-3 rolls of black THHN at 12 AWG at all times, with reorder trigger at 1 roll remaining. Depletion pace typically matches 1 to 2 rolls per active project month. Small commercial electrical contractor (2-5 electricians): Maintain 4-6 rolls of black THHN at 12 AWG in active inventory. Reorder in pairs to maintain minimum 2-roll buffer. Mid-sized commercial contractor (5-15 electricians): Maintain 8-12 rolls of black THHN at 12 AWG in active inventory. Consider larger spool quantities (2500 ft, 5000 ft) for further cost efficiency. Large commercial contractor or wholesale distributor: Consider pallet quantities (66 rolls) of the equivalent NM-B cables, though pallet quantities of individual color THHN rolls are less common. Multiple 500-ft roll purchases typically match consumption pace. Because black THHN is consumed on every circuit, running out mid-project causes significant productivity loss. Overstocking is also unusual because the wire keeps indefinitely in properly stored conditions and always sells to the next project. The optimal balance maintains 1-2 months of typical consumption in stock at any given time. For contractors buying multiple 500-ft rolls at once, IB Lighting free freight applies to each order, providing consistent freight economics across order sizes. Larger contractors may benefit from ordering the standard 4-color set (black, red, white, green) together to minimize procurement overhead. Conduit Fill Including the Hot Conductor The Southwire 12 AWG black THHN takes up the same conduit space as any other 12 AWG THHN color. For conduit fill planning, the black hot conductor is one of the standard conductor set counted toward the maximum fill percentages per NEC Chapter 9. Typical conductor counts per circuit type: Standard 120V circuit: 3 conductors (black white green). 240V circuit with neutral: 4 conductors (black red white green). 240V-only circuit: 3 conductors (black red green). Multi-wire branch circuit: 4 conductors (black red white shared neutral green). Three-phase wye 208V/120V circuit: 5 conductors (black red blue white green). Per NEC Chapter 9 Table 4 for 1/2-inch EMT conduit at maximum 40% fill for 3 conductors, the typical capacity for 12 AWG THHN conductors is approximately 9 conductors. Standard 3-4 conductor pulls fit comfortably in 1/2-inch EMT with substantial capacity remaining. For 5-conductor three-phase pulls, 1/2-inch is still adequate but 3/4-inch provides easier pulling and future expansion capacity. Southwire 12 AWG Black THHN Specifications Southwire 12 AWG Black 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 Black (conventional Phase A hot conductor color) Length 500 ft Roll Voltage Rating 600V Temperature Rating 90C Circuit Capacity 20-Amp Branch Circuits Location Rating Dry and Wet Locations (THHN/THWN-2 dual rated) Installation Inside Conduit, Raceway, or Equivalent Protective System Common Application Primary Hot Conductor for 120V Circuits and Phase A of 240V Circuits Code Compliance NEC Article 210 (Branch Circuits), Article 310 (Conductors for General Wiring) Certification UL Listed Master Electrician Led Why Buy the Southwire 12 AWG Black THHN from IB Lighting IB Lighting is a family-owned, nationwide reseller of electrical supplies, led by licensed Master Electrician Imad Boussi. Buying black THHN in bulk requires understanding contractor consumption patterns, matching gauge specifications to circuit requirements, and pairing hot conductors with the correct companion colors for complete circuit sets, and that Master Electrician expertise matters when contractors are planning inventory, verifying gauge sizing for specific applications, or troubleshooting installation issues during inspection. Every Southwire 12 AWG black 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 on 240V circuits, Southwire 12 AWG white THHN for neutral conductors, Southwire 12 AWG green THHN for equipment grounds, Southwire 12 AWG yellow THHN for alternative identification, or explore other Southwire products. Southwire 12 AWG Black THHN FAQs Is black THHN required by NEC for hot conductors? No. NEC 210.5 permits any color EXCEPT white, gray, green, or green with yellow stripes for ungrounded (hot) conductors. Black is a strong industry convention rather than a code mandate. Other colors including red, blue, brown, orange, and yellow are technically permissible for hot conductors. However, black has become the near-universal choice for the primary hot conductor through decades of consistent industry practice, and using anything other than black for the primary hot creates unnecessary confusion during installation, inspection, and maintenance. What circuits use 12 AWG black THHN specifically? The Southwire 12 AWG black THHN handles the Phase A hot conductor role for 20-amp circuits. This includes residential 120V circuits (kitchen countertop receptacles, bathroom GFCI circuits, laundry, garage, outdoor receptacles, general-purpose receptacles, and lighting circuits), residential 240V/20A circuits (smaller AC condensers, point-of-use water heaters, smaller workshop equipment), and commercial 20A circuits (three-phase 208V Phase A, commercial receptacles and lighting). For circuits with breakers larger than 20 amps, step up to 10 AWG (30A), 8 AWG (40A), or 6 AWG (50A) black THHN. Should I buy black and white THHN together? Yes, for 120V circuit installations. Every 120V circuit requires a black hot, white neutral, and green ground. Buying all three colors simultaneously matches typical contractor consumption patterns and ensures matched brand consistency across installations. IB Lighting stocks companion Southwire 12 AWG white THHN for neutrals and green THHN for grounds. For 240V circuits, add red THHN for the Phase B second hot conductor. How does black THHN differ from red or blue THHN? The physical wire is identical: same THHN/THWN-2 specification, same gauge, same insulation construction, same UL listing. The only difference is the insulation color, which conveys the conductor’s role in the circuit. Black is the convention for Phase A hot (used on every circuit), red for Phase B hot (240V circuits), and blue for Phase C hot (three-phase commercial). The colors help electricians instantly identify which role each conductor serves during installation, troubleshooting, and inspection. Can I install 12 AWG black THHN without conduit? No. THHN/THWN-2 single conductors must be installed inside conduit, raceway, or other approved protective system per NEC Article 310. The conductor cannot be installed directly in framing without conduit protection. For installation directly in framed walls without conduit, NM-B (Romex) cable is the correct alternative (which has the black hot inside the multi-conductor assembly). THHN-in-conduit and NM-B installations serve different purposes and are not interchangeable. Can the Southwire 12 AWG black 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 installations without conduit, UF-B cable is the appropriate alternative. Why is black THHN the highest-volume color in inventory? Because black serves as the primary hot conductor in every conduit installation regardless of circuit type. Every 120V circuit uses black. Every 240V circuit uses black plus red. Every three-phase circuit uses black plus red plus blue. This universal application makes black THHN the single highest-consumption color, tied only with green THHN (which is required on every conduit installation for equipment grounding). Typical contractor stocking maintains black and green at 2 to 3 times the ratio of red, and 5 to 10 times the ratio of specialty colors. How many black THHN conductors fit in 1/2-inch conduit? Per NEC Chapter 9 Table 4, 1/2-inch EMT conduit accommodates approximately 9 conductors of 12 AWG THHN at the maximum 40% fill for 3 conductors. For a typical 120V circuit requiring 3 conductors (black white green), 1/2-inch EMT provides comfortable fill capacity with substantial room remaining. For 240V circuits (4 conductors) and three-phase circuits (5 conductors), 1/2-inch is still adequate but 3/4-inch conduit provides easier pulling and future expansion capacity. What does ‘THHN/THWN-2’ mean for black 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 black THHN carries the dual THHN/THWN-2 rating, which allows installation in either dry or wet conditions. The black insulation color identification applies regardless of which rating governs the specific installation. Can I use black THHN for the neutral or ground? No. Per NEC 200.6, the neutral must be white or gray. Per NEC 250.119, the equipment ground must be green, green with yellow stripe, or bare copper. Using black THHN for the neutral or ground is a code violation regardless of how the cable is terminated or labeled. The color rules are strict: hot conductors use black or other permitted colors (red, blue, brown, orange, yellow), neutral uses white or gray, and ground uses green or bare copper. How long is the Southwire 12 AWG black THHN roll? The Southwire 12 AWG black THHN ships in 500-foot rolls (by-the-roll quantity). This length matches typical electrician inventory pace for active electrical installation work. Because black THHN is consumed on every conduit installation regardless of circuit type, the 500-foot roll typically depletes faster than any other single color, requiring more frequent reordering than red, blue, yellow, or other specialty colors. How long does shipping take from IB Lighting? Most Southwire 12 AWG black 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 Black THHN Is Built For The Southwire 12 AWG black THHN serves the broadest buyer base of any THHN color because of the universal application of hot conductors in every conduit installation. Every electrical contractor doing conduit work consumes black 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 black THHN is the primary hot conductor for every 120V branch circuit and the Phase A hot for every 240V circuit they install. The 500-foot roll matches typical contractor consumption pace, typically depleting faster than any other single color. The secondary buyer is the commercial electrical contractor handling three-phase circuit installations, commercial receptacle circuits, and commercial lighting installations. For these contractors, the 12 AWG black THHN serves the Phase A role in three-phase distribution and the primary hot in single-phase commercial circuits. The tertiary buyer is the specialty installer handling HVAC equipment circuits, dedicated appliance circuits, workshop and garage equipment circuits, and outdoor equipment circuits. For these installers, the black THHN serves the primary hot conductor role across the diverse application mix. The quaternary buyer is the industrial maintenance electrician handling equipment circuits, control circuits, and instrumentation in manufacturing and process environments. For these electricians, the black THHN serves multiple hot conductor roles across the industrial application spectrum. Browse the broader IB Lighting electrical wire collection for related products. Black THHN vs Red, White, Green, Yellow THHN Among the THHN color family, black THHN occupies the most fundamental position. Understanding how it compares to the other colors clarifies the complete conductor set for any circuit installation. The complete THHN color comparison: Black THHN (this product): Phase A hot conductor. Used on EVERY circuit type (120V, 240V, three-phase). Red THHN: Phase B hot conductor. Used on 240V single-phase and three-phase Phase B applications. Blue THHN: Phase C hot conductor. Used on three-phase commercial applications only. White THHN: Neutral conductor. Used on EVERY circuit with 120V loads. Green THHN: Equipment grounding conductor. Used on EVERY conduit installation. Yellow, Brown, Orange THHN: Alternative identification colors for specialty applications and multi-system buildings. For a typical residential 120V circuit, the standard three-color set is black white green. For a typical 240V circuit with 120V accessories, the four-color set is black red white green. For a three-phase commercial circuit, the five-color set is black red blue white green. In every case, the Southwire 12 AWG black THHN (this product) serves the Phase A hot role. Complete the standard 4-color 240V circuit set at IB Lighting by pairing with Southwire 12 AWG red THHN for the Phase B hot, Southwire 12 AWG white THHN for the neutral, and Southwire 12 AWG green THHN for the equipment ground. 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 Black THHN Installing the Southwire 12 AWG black THHN follows standard practices for THHN conductor pulls through conduit, with hot conductor-specific considerations that ensure code-compliant safety performance and correct circuit identification. Verify the circuit conductor set: For 120V circuits, plan black white green. For 240V circuits, plan black red green (240V-only) or black red white green (with 120V accessories). Have all conductors on hand and labeled before starting the pull. Terminate black to the breaker: At the panel, the black THHN terminates at the breaker terminal, connecting to the ungrounded bus bar via the breaker. Never terminate black to the neutral bar or equipment ground bar. Terminate correctly at load equipment: At the device or load equipment, the black THHN connects to the “hot” terminal (brass screw on receptacles, black lead on hardwired equipment). Verify the manufacturer’s wiring diagram to confirm correct terminal assignment. Match black conductor gauge to breaker rating: For 20A circuits, 12 AWG black THHN (this product) is correct. For 30A circuits, 10 AWG black THHN is required. For 40A/50A circuits, larger gauges are required. Undersizing the hot conductor creates a fire hazard. Maintain identification through the run: The black insulation color provides visual identification throughout the pull. In multi-circuit conduit installations, verify that each circuit’s black hot conductor connects to the correct breaker at the panel and the correct terminal at the load. Mixing black conductors between circuits creates confusing troubleshooting later. Verify polarity at each device: Use a plug-in receptacle tester or multimeter to verify correct polarity (hot on brass screw side, neutral on silver screw side, ground on green screw). Reversed polarity is a code violation and a shock hazard on some equipment. Test the installed circuit: Before energizing under load, verify continuity, correct polarity, GFCI operation where applicable, and equipment ground continuity. A multimeter or plug-in tester takes minutes and prevents post-install issues. Label the panel breaker: Every installed circuit should have a labeled breaker at the panel indicating the circuit’s purpose and location. Handwritten labels degrade over time; consider printed labels or label maker labels for durability. 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, pair with Southwire 12 AWG white THHN for neutral conductors, pair with Southwire 12 AWG green THHN for equipment grounding conductors, compare with Southwire 12 AWG yellow THHN for alternative identification applications, 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 Black THHN? Every-circuit inventory need, active contractor stocking, or planning the complete 4-color 240V conductor set? Talk to a Master Electrician-led team that knows the conductor color conventions and gauge sizing. Call (800) 674-9019