What Size Wire Do You Use For A 100 Amp Service Panel

When determining feeder usher size, you'll want to consider the "everyman temperature rating of any connected termination, conductor, or device" as per National Electrical Code (NEC) Commodity 110.fourteen(C).

While the cablevision/wire may be rated at 90°C, you lot'll likely notice that the terminals are rated at 75°C, or non labeled at all. 110.14(C)(one)(a) tells us, that since we're working with 100 amperes or less. We should use the 60°C column of Table 310.15(B)(16) to decide the conductor size, unless the equipment is listed and labeled for a higher temperature.

National Electrical Lawmaking 2014

Commodity 110 Requirements for Electrical Installations

110.14(C)(ane) Equipment Provisions. The conclusion of termination provisions of equipment shall exist based on 110.14(C)(1)(a) or (C)(i)(b). Unless the equipment is listed and marked otherwise, conductor ampacities used in determining equipment termination provisions shall exist based on Table 310.fifteen(B)(sixteen) (formerly 310.xvi) as appropriately modified by 310.fifteen(B)(half dozen).

(a) Termination provisions of equipment for circuits rated 100 amperes or less, or marked for 14 AWG through one AWG conductors, shall be used only for one of the following:

(i) Conductors rated 60°C (140°F).

(2) Conductors with higher temperature ratings, provided the ampacity of such conductors is determined based on the 60°C (140°F) ampacity of the conductor size used.

(3) Conductors with higher temperature ratings if the equipment is listed and identified for use with such conductors.

(4) For motors marked with design letters B, C, or D, conductors having an insulation rating of 75°C (167°F) or higher shall exist permitted to exist used, provided the ampacity of such conductors does not exceed the 75°C (167°F) ampacity.

Since the cablevision will run from a breaker in the primary service panel, to either a breaker or lugs in a subpanel. Nosotros have to consider the temperature rating of...

• The conductors
• The terminals in the chief console where the conductors will connect.
• The terminals in the sub console where the conductors will connect.

Nosotros'll then apply the lowest value, or 60°C if any of the to a higher place are non labeled. In one case we know the size of the overcurrent devices, and the lowest temperature rating, nosotros can use Table 310.15(B)(xvi) to decide the conductor size and material nosotros'll need.

This will give us the electric current carrying conductor size required for our feeder.

But look...

If you're working in a one-, two-, or multi-family unit dwelling unit of measurement, is Article 310.fifteen(B)(7) applicable?

National Electrical Code 2014

ARTICLE 310 Conductors for Full general Wiring

310.15 Ampacities for Conductors Rated 0–2000 Volts.

(B) Tables. Ampacities for conductors rated 0 to 2000 volts shall exist every bit specified in the Allowable Ampacity Table 310.15(B)(sixteen) through 310.15(B)(19), and Ampacity Table 310.15(B)(20) and Tabular array 310.xv(B)(21) equally modified by (B)(1) through (B)(7).
The temperature correction and adjustment factors shall be permitted to exist applied to the ampacity for the temperature rating of the conductor, provided the corrected and adjusted ampacity does not exceed the ampacity for the temperature rating of the termination in accordance with the provisions of 110.fourteen(C).

(seven) 120/240-Volt, three-Wire, Single-Phase Abode Services and Feeders.

(a) For individual dwelling units of i-family, ii-family, and multifamily dwellings, conductors, every bit listed in Table 310.15(B)(vii), shall be permitted as 120/240-volt, single-phase service-entrance conductors and service lateral conductors.

NO.

Find the codes says

"shall be permitted as 120/240-volt, single-phase service-entrance conductors and service lateral conductors ".

Afterward reading the definition of these terms, it's clear that this does not apply to the wire between the primary console and a subpanel.

Service-Archway Conductors, Overhead System. The service conductors between the terminals of the service equipment and a betoken commonly outside the building, articulate of edifice walls, where joined by tap or splice to the service drop or overhead service conductors.

Service-Entrance Conductors, Underground System. The service conductors between the terminals of the service equipment and the point of connection to the service lateral or underground service conductors.

Service Lateral. The underground conductors between the utility distribution system and the service point.

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tl;dr

Conductors and all terminals rated at or in a higher place 75°C.

Employ 3 AWG copper or 1 AWG aluminium for the electric current carrying conductors.

Conductors rated at or above 75°C, terminals rated at threescore°C or unlabeled.

Employ 1 AWG copper or ane/0 AWG aluminium for the current conveying conductors.

Conductors and terminals rated at lx°C.

Use 1 AWG copper or 1/0 AWG aluminium for the current conveying conductors.

Conductors rated at 60°C, terminals rated college than 60°C

Apply 1 AWG copper or 1/0 AWG aluminium for the electric current conveying conductors.

What Size Wire Do You Use For A 100 Amp Service Panel,

Source: https://diy.stackexchange.com/questions/29057/what-wire-gauge-do-i-need-for-a-100-amp-subpanel-at-the-end-of-a-60-wire-run

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