{"id":3843,"date":"2026-08-19T16:01:17","date_gmt":"2026-08-19T16:01:17","guid":{"rendered":"https:\/\/huyuglobal.com\/?p=3843"},"modified":"2026-08-19T16:01:18","modified_gmt":"2026-08-19T16:01:18","slug":"wire-size-for-100-amp-service","status":"publish","type":"post","link":"https:\/\/huyuglobal.com\/vi\/blog\/wire-size-for-100-amp-service\/","title":{"rendered":"K\u00edch th\u01b0\u1edbc d\u00e2y cho d\u1ecbch v\u1ee5 100 Amp"},"content":{"rendered":"<p>Whether you are upgrading your old residential home service from 60A to 100A, installing a feeder line to a detached garage, or wiring a new workshop, the first question is always the same \u2014 what kind of wiring (copper or aluminum) do I need for a 100 amp service? The answer rests upon two different codes that apply, since a residential service can use NEC 310.12 and thus require 83% ampacity (4 AWG copper or 2 AWG aluminum), while a commercial service means either that you require 3 AWG copper (to ensure full ampacity) or 1 AWG aluminum. Get it right and you pass inspection; get it wrong and you will either fail inspection or overheat the most critical wire in your construction site. The following guide will provide you with all sizes of wire that you require, codes behind them, various calculations involving copper and aluminum wire, and details all about the installation process.<\/p>\n<blockquote><p>In short: According to NEC 310.12 (the 83% rule), for a residential 100A single-phase 120\/240V service, the minimum for copper is 4 AWG and for aluminum is 2 AWG. For commercial usage, three-phase services, or 100A sub-panel feeders, the requirements of the full NEC 310.16 apply for ampacity: the minimum for copper is 3 AWG and for aluminum is 1 AWG. 2 AWG copper (115A) can also be suitable for many circuits of 100A according to NEC 240.4(B). 6 AWG doesn&#8217;t meet the requirements since it falls short (at 65A for 75 \u00b0C). Adjust sizing to the values in the 75 \u00b0C column, adjust to larger size for any distances longer than ~100-150 ft, and double-check with both a local inspector and local utilities on your project.<\/p><\/blockquote>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3845\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/08\/The-Direct-Answer-Wire-Size-for-100A-Service.webp\" alt=\"The Direct Answer: Wire Size for 100A Service\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>The Direct Answer: Wire Size for 100A Service<\/h2>\n<p>Here is the full answer in a single table. Which row you need depends on the type of structure and whether this is the service entrance or feeder.<\/p>\n<table>\n<thead>\n<tr>\n<th>K\u1ecbch b\u1ea3n<\/th>\n<th>\u0110\u1ed3ng<\/th>\n<th>Nh\u00f4m<\/th>\n<th>C\u01a1 s\u1edf m\u00e3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Residential dwelling service<\/strong> (\u0111\u01a1n pha 120\/240V, h\u1ea7u h\u1ebft c\u00e1c nh\u00e0)<\/td>\n<td><strong>4 AWG<\/strong><\/td>\n<td><strong>2 AWG<\/strong><\/td>\n<td>NEC 310.12 (quy t\u1eafc 83%)<\/td>\n<\/tr>\n<tr>\n<td><strong>Commercial \/ industrial service<\/strong> (\u0111\u01a1n pha ho\u1eb7c ba pha)<\/td>\n<td><strong>3 AWG<\/strong><\/td>\n<td><strong>1 AWG<\/strong><\/td>\n<td>NEC 310.16 (\u0111\u1ea7y \u0111\u1ee7 c\u00f4ng su\u1ea5t)<\/td>\n<\/tr>\n<tr>\n<td><strong>100A sub-panel feeder<\/strong> (garage, workshop, ADU)<\/td>\n<td><strong>3 AWG<\/strong><\/td>\n<td><strong>1 AWG<\/strong><\/td>\n<td>NEC 310.16 (kh\u00f4ng ngo\u1ea1i l\u1ec7 nh\u00e0 \u1edf)<\/td>\n<\/tr>\n<tr>\n<td><strong>100A three-phase service<\/strong> (b\u1ea5t k\u1ef3 lo\u1ea1i s\u1eed d\u1ee5ng n\u00e0o)<\/td>\n<td><strong>3 AWG<\/strong><\/td>\n<td><strong>1 AWG<\/strong><\/td>\n<td>NEC 310.16 (kh\u00f4ng ngo\u1ea1i l\u1ec7 nh\u00e0 \u1edf)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Here are three clarifications to note:<\/p>\n<ul>\n<li>6 AWG is not suitable to carry a load of 100A because copper with 6AWG can only carry 65A at a temperature of 75 degree Celsius. Thus it should be a part of a circuit of 50-60A.<\/li>\n<li>3 AWG copper wire is useful to carry exactly 100A in 75 degrees Celsius.<\/li>\n<li>2 AWG copper works too since it has a capacity of 115A at 75 degrees, so according to NEC 240.4(B) it can be wired to circuit employing a 100A breaker.<\/li>\n<\/ul>\n<h2>NEC 310.12 &amp; Quy t\u1eafc 83% (D\u1ecbch v\u1ee5 nh\u00e0 \u1edf)<\/h2>\n<p>NEC 310.12 allows service and whole-house feeder conductors to be sized at 83% of the service rating for a one-family dwelling (or an individual dwelling unit) powered by a single-phase 120\/240V system. The reasoning behind the rule is the fact that loads in a household are diversified. Indeed, it is impossible that all electrical loads work together. Hence, NEC allows to use smaller conductor sizes than the ones specified in the general tables.<\/p>\n<p>The calculation for 100A goes like this: 100 x 0.83 = 83A required ampacity. To check the ampacity, we need to find the temperature rating \u2012 if we&#8217;re talking about 75\u00b0C:<\/p>\n<ul>\n<li>4 AWG copper (85A) \u2192 can handle 83A \u2192 it is a standard copper size for residential services of 100A.<\/li>\n<li>2 AWG aluminum (90A) \u2192 can handle 83A \u2192 it is a standard aluminum size for residential services of 100A.<\/li>\n<\/ul>\n<p>That is the reason why people say &#8220;100A service equals 4 AWG copper or 2 AWG aluminum&#8221; \u2013 the rule states the fact that it is one gauge size smaller than the one in general tables. However, it does not apply to<\/p>\n<ul>\n<li>Commercial, retail, office, warehouse, or manufacturing buildings.<\/li>\n<li>Three-phase services.<\/li>\n<li>Feeders to subpanels \u2012 they utilize full 310.16 ampacity even if used in the same household.<\/li>\n<\/ul>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3846\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/08\/NEC-310.16-Full-Ampacity-for-Commercial-Sub-Panels.webp\" alt=\"NEC 310.16: Full Ampacity for Commercial &amp; Sub-Panels\" width=\"1448\" height=\"1086\" \/><\/p>\n<h2>NEC 310.16: Full Ampacity for Commercial &amp; Sub-Panels<\/h2>\n<p>When the dwelling exception doesn&#8217;t apply, size to <strong>NEC 310.16 at 75\u00b0C<\/strong> (the standard for service equipment terminations):<\/p>\n<table>\n<thead>\n<tr>\n<th>D\u00e2y d\u1eabn<\/th>\n<th>D\u00f2ng \u0111i\u1ec7n \u0111\u1ecbnh m\u1ee9c @ 75\u00b0C<\/th>\n<th>Works for 100A?<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>6 AWG copper<\/td>\n<td>65 A<\/td>\n<td>No (50-60A circuit)<\/td>\n<\/tr>\n<tr>\n<td>4 AWG copper<\/td>\n<td>85 A<\/td>\n<td>No under 310.16 (only under 310.12 dwellings)<\/td>\n<\/tr>\n<tr>\n<td><strong>3 AWG copper<\/strong><\/td>\n<td>100 A<\/td>\n<td><strong>C\u00f3 \u2014 t\u1ed1i thi\u1ec3u<\/strong><\/td>\n<\/tr>\n<tr>\n<td>2 AWG copper<\/td>\n<td>115 A<\/td>\n<td>Yes (common choice for headroom)<\/td>\n<\/tr>\n<tr>\n<td>2 AWG aluminum<\/td>\n<td>90 A<\/td>\n<td>Kh\u00f4ng theo 310.16 (ch\u1ec9 theo 310.12)<\/td>\n<\/tr>\n<tr>\n<td>1 AWG aluminum<\/td>\n<td>100 A<\/td>\n<td><strong>C\u00f3 \u2014 t\u1ed1i thi\u1ec3u<\/strong><\/td>\n<\/tr>\n<tr>\n<td>1\/0 aluminum<\/td>\n<td>120 A<\/td>\n<td>C\u00f3 (d\u01b0 margin)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Main result: Although 4 AWG copper is acceptable for home service, it does not work for a garage sub-panel or commercial 100A circuit wire \u2014 this wire can be approved but not via the sub-panel feeder standard method. This is where most of the confusion appears from and that\u2019s why the standard for sub-panel feeder copper wiring is 3 AWG copper or 1 AWG aluminum.<\/p>\n<h2>Copper vs Aluminum: What&#8217;s Different<\/h2>\n<p>Both are code-compliant; the choice is economics plus installation discipline:<\/p>\n<table>\n<thead>\n<tr>\n<th>Y\u1ebfu t\u1ed1<\/th>\n<th>\u0110\u1ed3ng<\/th>\n<th>Nh\u00f4m<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Chi ph\u00ed t\u01b0\u01a1ng \u0111\u1ed1i<\/td>\n<td>C\u01a1 b\u1ea3n (\u0111\u1eaft)<\/td>\n<td>Roughly 40-60% less at this size<\/td>\n<\/tr>\n<tr>\n<td>Size needed for 100A (310.16)<\/td>\n<td>3 AWG<\/td>\n<td>1 AWG (two sizes larger)<\/td>\n<\/tr>\n<tr>\n<td>Tr\u1ecdng l\u01b0\u1ee3ng<\/td>\n<td>Heavier<\/td>\n<td>About 1\/3 the weight \u2014 easier to pull<\/td>\n<\/tr>\n<tr>\n<td>Conductivity<\/td>\n<td>Cao h\u01a1n<\/td>\n<td>~61% of copper&#8217;s<\/td>\n<\/tr>\n<tr>\n<td>Termination rules<\/td>\n<td>Ti\u00eau chu\u1ea9n<\/td>\n<td>Anti-oxidant compound, AL-rated lugs, correct torque \u2014 mandatory<\/td>\n<\/tr>\n<tr>\n<td>Corrosion<\/td>\n<td>T\u1ed1i thi\u1ec3u<\/td>\n<td>Oxidizes at terminations if untreated<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Aluminum is practically the most popular material used for both the 100A service entrance as well as for long feeders. Its installation is also common knowledge among certified electrical workers. There are three essentials that have to be used in all aluminum installations: an anti-oxidant joint connecting compound, terminals with AL\/CU rating, and a torque wrench according to the manufacturer&#8217;s recommendations.<\/p>\n<h2>What Does &#8220;2-2-2-4&#8221; Wire Mean?<\/h2>\n<p>If you are picking a residential 100A feeder, the cable is noted to be &#8220;2-2-2-4&#8221; (this might appear as &#8220;2-2-2-4 SER&#8221; or &#8220;2-2-2-4 AL&#8221;). This notation breaks down the conductors in it: 2 conductors of 2 AWG are the 2 hot legs, and another 4 AWG is the neutral type of conductor along with one conductor of 4 AWG for grounding purpose.<\/p>\n<ul>\n<li>Two 2 AWG hots + 2 AWG neutral provide the 120\/240 volt circuit.<\/li>\n<li>4 AWG is the ground for the equipment.<\/li>\n<li>Since this is aluminium type of SER cable, it fulfills the standard 100A residential requirement of electrical installations per NEC 310.12 (2 AWG = 90A, more than enough voltage output of 83A).<\/li>\n<\/ul>\n<p>To the question, &#8220;does 2-2-2-4 wire suffice for 100 amps?&#8221; the answer is \u201cyes\u201d for residential service and 100A feeder, where the 83% regulation would apply. However, it wouldn&#8217;t work for commercial services at 100A that would be needing 1 AWG cables for the hots.<\/p>\n<h2>Will 6 Gauge Wire Handle 100 Amps?<\/h2>\n<p>6 AWG copper wire is appropriate for 65A at 75\u00b0C (55A at 60\u00b0C) jobs which is not sufficient for a 100A service since this wire overheating can damage the insulation and create a serious fire risk. It is preferable to use this wire in low amperage circuits, up to 50-60A. For jobs with 100A or more workloads one has to use wire sizes of 3 AWG of copper or 1 AWG of aluminum.<\/p>\n<h2>Is #3 Copper Good for 100 Amps?<\/h2>\n<p>Indeed. 3 AWG copper is rated for 100A at 75\u00b0C; making it the exact minimum for a 100A general circuit, commercial service, or sub-panel feeder under NEC 310.16. Many electricians choose 2 AWG copper (115A) for ample room, derating, or long runs; which is indeed acceptable. For residential service only, 4 AWG copper is sufficient. In a nutshell, when asked is #3 copper good for 100 amps; this wire is indeed rated properly.<\/p>\n<h2 id=\"run-length\">Run Length &amp; Voltage Drop<\/h2>\n<p>Ampacity isn&#8217;t the only constraint \u2014 long runs lose voltage. Recommended maximums to stay within a 3% drop at 240V:<\/p>\n<table>\n<thead>\n<tr>\n<th>D\u00e2y d\u1eabn<\/th>\n<th>Chi\u1ec1u d\u00e0i ch\u1ea1y t\u1ed1i \u0111a m\u1ed9t chi\u1ec1u x\u1ea5p x\u1ec9 (s\u1ee5t \u00e1p 3%)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>3 AWG copper<\/td>\n<td>~147 ft<\/td>\n<\/tr>\n<tr>\n<td>2 AWG copper<\/td>\n<td>~185 ft<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ed3ng 1 AWG<\/td>\n<td>~234 ft<\/td>\n<\/tr>\n<tr>\n<td>1 AWG aluminum<\/td>\n<td>~142 ft<\/td>\n<\/tr>\n<tr>\n<td>1\/0 aluminum<\/td>\n<td>~178 ft<\/td>\n<\/tr>\n<tr>\n<td>4 AWG copper (310.12 dwelling)<\/td>\n<td>~116 ft<\/td>\n<\/tr>\n<tr>\n<td>2 AWG aluminum (310.12 dwelling)<\/td>\n<td>~112 ft<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>General information: ampacity is good for lengths up to around 100 ft, consider going one size up from 100-150 ft, and for lengths of around 150 ft and beyond, ampacity will need at least one size up (for example, from 3 AWG copper to 2 AWG or from 1 AWG aluminum to 1\/0). In general, long runs in rural areas usually need more than one size increase.<\/p>\n<h2>Neutral &amp; Grounding Conductor Sizing<\/h2>\n<p>A full installation of 100A must include neutral and grounding conductors as follows:<\/p>\n<ul>\n<li>Neutral: Correctly determined as per the calculated unbalanced loading (NEC Table 220), it is equivalent to the circuit hots for a 100A service in most cases, whereas one size lower in case allowed by the calculations.<\/li>\n<li>Grounding electrode conductor (GEC) \u2013 sized as per NEC table 250.66 \u2013 GEC is usually 8AWG copper minimum for 4AWG copper or 2 AWG aluminum service conductors; check the table for your proper wire size.<\/li>\n<li>Equipment ground (subs): sized as per NEC table 250.122 \u2013 typically 8 AWG copper or 6 AWG aluminum for 100A feeder.<\/li>\n<li>Grounding electrodes: for a building service grounded by two rods at decent distance from one another (NEC table 250.52).<\/li>\n<\/ul>\n<p>It is one of the most common manageable mistakes in the service work to confuse tables 250.66 (GEC) and 250.122 (equipment ground) \u2013 pick the correct table for the right wire.<\/p>\n<h2>Sub-Panel Specifics: Detached Garage &amp; Workshop<\/h2>\n<p>Running 100A to a detached garage, workshop, or ADU has additional codes and regulations to consider:<\/p>\n<ul>\n<li>A 4-wire feeder must be installed; this includes two hots going from the main panel, one neutral, and an equipment ground (NEC 250.32). Remember that the installation of a 3-wire feeder in a detached building is not acceptable.<\/li>\n<li>The neutral must be isolated. You must ensure that the neutral bar in the sub-panel is separately placed from the ground bar. The main panel provides the bonding of these two.<\/li>\n<li>Grounding is necessary for the new structure. The detached building should have its own grounding system (typical grounding rods in place to be used).<\/li>\n<li>The cable type will typically be 1 AWG SER aluminum or 3 AWG copper in the conduit for the 100A feeder; this has to adhere to 310.16.<\/li>\n<li>Make load calculations &#8211; it&#8217;s essential to perform load calculations before purchasing the wiring. An ADU with electric heats and an EV charging unit may require 125A and not 100A.<\/li>\n<\/ul>\n<h2>Common Mistakes on 100A Installations<\/h2>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3847\" src=\"https:\/\/huyuglobal.com\/wp-content\/uploads\/2026\/08\/Common-Mistakes-on-100A-Installations.webp\" alt=\"Common Mistakes on 100A Installations\" width=\"1448\" height=\"1086\" \/><\/p>\n<table>\n<thead>\n<tr>\n<th>Sai l\u1ea7m<\/th>\n<th>T\u1ea1i sao sai<\/th>\n<th>C\u00e1ch ti\u1ebfp c\u1eadn \u0111\u00fang<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Using 4 AWG copper for a sub-panel<\/td>\n<td>4 AWG is only 85A \u2014 the 83% rule doesn&#8217;t apply to feeders<\/td>\n<td>3 AWG copper or 1 AWG aluminum for 100A feeders<\/td>\n<\/tr>\n<tr>\n<td>S\u1eed d\u1ee5ng 310.16 cho d\u1ecbch v\u1ee5 nh\u00e0 \u1edf<\/td>\n<td>Forces 3 AWG copper where 4 AWG is legal \u2014 wasted money<\/td>\n<td>S\u1eed d\u1ee5ng 310.12 cho nh\u00e0 \u1edf \u0111\u01a1n pha 120\/240V<\/td>\n<\/tr>\n<tr>\n<td>6 AWG &#8220;looks close enough&#8221;<\/td>\n<td>65A \u2014 serious overload hazard<\/td>\n<td>Never size by guess; use the tables<\/td>\n<\/tr>\n<tr>\n<td>3-wire feeder to a detached building<\/td>\n<td>No separate ground \u2014 code violation, shock hazard<\/td>\n<td>4-wire feeder + grounding electrode at the building<\/td>\n<\/tr>\n<tr>\n<td>Bonding neutral to ground in the sub-panel<\/td>\n<td>Creates parallel return path \u2014 dangerous<\/td>\n<td>Keep neutral and ground bars separate in sub-panels<\/td>\n<\/tr>\n<tr>\n<td>Aluminum without compound\/torque<\/td>\n<td>Oxidized terminations overheat<\/td>\n<td>Joint compound + AL-rated lugs + torque spec<\/td>\n<\/tr>\n<tr>\n<td>B\u1ecf qua chi\u1ec1u d\u00e0i ch\u1ea1y d\u00e2y<\/td>\n<td>Voltage drop starves the far end<\/td>\n<td>Upsize beyond ~100-150 ft<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e2n nh\u1eafc v\u1ec1 chi ph\u00ed &amp; gi\u1ea5y ph\u00e9p<\/h2>\n<p>Upgrade to a 100A service or installation of a new electrical feeder has the following costs:<\/p>\n<ul>\n<li>Materials include: panel \u2013 $60-$200, 100A main breaker \u2013 $30-$80, 2-2-2-4 aluminum SER \u2013 $1.50-$3 per foot, 3 AWG copper \u2013 $3-$6 per foot, meter base and hardware \u2013 $50-$150.<\/li>\n<li>Jobs will run at $800-$2,500 for a service upgrade and $500-$1,500 for a sub-panel feeder, based on run distance and access through walls.<\/li>\n<li>The permit and inspection normally cost $50-$300 and are required. Inspectors check wire and grounding size and bonding to be finished.<\/li>\n<li>Utility coordination is needed as the utility will own the meter and service connection.<\/li>\n<\/ul>\n<p>When the project also involves panelboard and breakers, matching certified protection devices \u2014 and understanding the breaker types involved, from the basics of <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/what-is-mccb-and-mcb\/\" rel=\"nofollow\">MCBs and MCCBs<\/a> vi\u1ec7c <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/what-is-ul-489-breakers\/\" rel=\"nofollow\">UL 489 breaker standards<\/a> \u2014 keeps the whole install compliant end to end. And once the 100A main is in, every branch circuit behind it follows the same sizing discipline \u2014 the limits explained for a <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/how-many-watts-on-a-15-amp-circuit\/\" rel=\"nofollow\">15-amp circuit&#8217;s wattage<\/a> apply at every level of the panel.<\/p>\n<h2>Ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf: M\u1ed9t ghi ch\u00fa nhanh<\/h2>\n<p>Outside of North America, the determination of 100A wiring is done differently as most of the world implements methods consistent with IEC\/BS 7671 standards (current and correction factor method) instead of using a simplified service table.<\/p>\n<ul>\n<li>In the UK (BS 7671), cable sizes are determined based on the installation method. For instance, a 100A single-phase connection usually requires a copper wire of between 25 and 50mm\u00b2 depending on how long the cable is.<\/li>\n<li>In Europe (IEC 60364), the straightforward method is used.<\/li>\n<li>In Australia (AS\/NZS 3000), method-based calculations are used for insulation and often result in use of 25 to 35mm\u00b2 wires.<\/li>\n<li>In Canada (CE Code), a similar argument to that put forth by the NEC is used; installations may be based on 83%-like formulas.<\/li>\n<\/ul>\n<p>The NEC procedure is based on rules pertaining specifically to the US and\/or Canada installations; hence, if the location of the job is different from those two places it would be wise to hire an engineer or electrician to carry out the calculations.<\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<h3>What size wire do we need for a 100 amp service?<\/h3>\n<p>According to NEC 310.12 for residential systems with 100A service (single phase), it is allowed to use 4 AWG copper or 2 AWG aluminum conductors. Whereas in commercial systems with three-phase or 100A sub-panel system, the full ampacity from the NEC 310.16 has to be applied, which means a minimum of 3 AWG copper or 1 AWG aluminum conductors. In terms of size for the GEC, 8 AWG copper conductor must be used as per 250.66 along with upsizing for distances of more than 100-150 feet.<\/p>\n<h3>Is #3 copper good for 100 amps?<\/h3>\n<p>Indeed &#8211; 3 AWG copper is rated precisely as 100A at 75\u00b0C, it is exactly the minimum required for 100A regular circuit, commercial service or sub-panel feeding based on NEC 310.16. However, a large number of electricians use 2 AWG copper (115A) instead to provide more headroom due to derating. For household services only, 4 AWG copper is considered okay.<\/p>\n<h3>Is 2-2-2-4 wire good for 100 amps?<\/h3>\n<p>Indeed, when it comes to residential applications, &#8220;2-2-2-4&#8221; SER cable (2 AWG hot wires, 2 AWG neutral wire, and 4 AWG ground wire) is considered as the standard aluminum type for 100A residential service as stated in NEC 310.12 (it should be noted that 2 AWG aluminum wire is rated at 90A, which is more than enough for the 83A needed). But when it comes to commercial applications, 1 AWG aluminum wire or 3 AWG copper wire needed for 100A commercial service is required.<\/p>\n<h3>Will 6 gauge wire handle 100 amps?<\/h3>\n<p>No. 6 AWG copper wire has a rating of just 65 amperes at a temperature of 75\u00b0C (55 amperes at 60\u00b0C), which is not suitable for 100 amperes. The wire will get hot, allowing for very high risks of fire. 6 AWG copper is appropriate for circuits carrying 50-60 amperes (for example with ranges, ovens, or small sub-panels). For 100A use either 3 AWG copper or 1 AWG aluminum wire (in general) or 4 AWG copper or 2 AWG aluminum wire (for dwelling services).<\/p>\n<h2>T\u00e0i li\u1ec7u tham kh\u1ea3o<\/h2>\n<ol>\n<li><a href=\"https:\/\/www.nfpa.org\/codes-and-standards\/nfpa-70-standard-development\" rel=\"nofollow noopener\" target=\"_blank\">NFPA 70 \u2014 National Electrical Code (NEC): Articles 230, 240, 250, 310<\/a><\/li>\n<li><a href=\"https:\/\/www.mikeholt.com\/code_changes.php\" rel=\"nofollow noopener\" target=\"_blank\">Mike Holt \u2014 NEC 310.12 83% Rule and Conductor Sizing<\/a><\/li>\n<li><a href=\"https:\/\/www.osha.gov\/laws-regs\/regulations\/standardnumber\/1910\/1910.303\" rel=\"nofollow noopener\" target=\"_blank\">OSHA 1910.303 \u2014 Y\u00eau c\u1ea7u \u0111i\u1ec7n t\u1ed5ng qu\u00e1t<\/a><\/li>\n<li><a href=\"https:\/\/www.ecmweb.com\/\" rel=\"nofollow noopener\" target=\"_blank\">EC&amp;M Magazine \u2014 Service and Feeder Sizing Articles<\/a><\/li>\n<li><a href=\"https:\/\/webstore.iec.ch\/\" rel=\"nofollow noopener\" target=\"_blank\">IEC 60364 \u2014 L\u1eafp \u0111\u1eb7t \u0111i\u1ec7n \u00e1p th\u1ea5p (Qu\u1ed1c t\u1ebf)<\/a><\/li>\n<li><a href=\"https:\/\/www.nema.org\/\" rel=\"nofollow noopener\" target=\"_blank\">NEMA \u2014 Conductor and Wiring Standards<\/a><\/li>\n<\/ol>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>The process of determining appropriate wire sizes for a service rated at 100 A depends on how you answer the question: does the 83% dwelling rule apply? According to NEC 310.12, in the case of residential applications, the standard wire sizing practice requires the use of 4 AWG copper wire or 2 AWG aluminum wire. In the case of commercial installations, systems equipped with three-phase motors, and hundred-amp sub-panels, the applicable wire sizes that comply with the code requirements concerning their ampacity correspond either with 3 AWG copper wire or with 1 AWG aluminum wire; therefore, in practice, 2 AWG copper wire is often used. When the panel and breakers are part of the job, understanding the protection devices \u2014 like <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/how-to-tell-if-a-breaker-is-bad\/\" rel=\"nofollow\">recognizing a failing breaker<\/a> and the practical pricing in <a href=\"https:\/\/huyuglobal.com\/vi\/blog\/how-much-to-replace-a-circuit-breaker\/\" rel=\"nofollow\">breaker replacement cost<\/a> \u2014 keeps the whole project safe, legal, and on budget.<\/p>","protected":false},"excerpt":{"rendered":"<p>Whether you are upgrading your old residential home service from 60A to 100A, installing a feeder line to a detached garage, or wiring a new workshop, the first question is always the same \u2014 what kind of wiring (copper or aluminum) do I need for a 100 amp service? The answer rests upon two different [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3844,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_gspb_post_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-3843","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blogs"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/3843","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/comments?post=3843"}],"version-history":[{"count":2,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/3843\/revisions"}],"predecessor-version":[{"id":3849,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/posts\/3843\/revisions\/3849"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/media\/3844"}],"wp:attachment":[{"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/media?parent=3843"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/categories?post=3843"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/huyuglobal.com\/vi\/wp-json\/wp\/v2\/tags?post=3843"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}