What Size Wire Is Needed To Pull 100 Amps 120'
When determining feeder conductor size, you'll desire to consider the "everyman temperature rating of any connected termination, conductor, or device" as per National Electrical Code (NEC) Commodity 110.14(C).
While the cablevision/wire may exist rated at xc°C, you'll likely find that the terminals are rated at 75°C, or non labeled at all. 110.xiv(C)(1)(a) tells us, that since nosotros're working with 100 amperes or less. We should use the 60°C cavalcade of Tabular array 310.15(B)(16) to determine the conductor size, unless the equipment is listed and labeled for a higher temperature.
National Electrical Code 2014
Article 110 Requirements for Electric Installations
110.xiv(C)(1) Equipment Provisions. The conclusion of termination provisions of equipment shall be based on 110.14(C)(1)(a) or (C)(1)(b). Unless the equipment is listed and marked otherwise, conductor ampacities used in determining equipment termination provisions shall exist based on Table 310.15(B)(16) (formerly 310.16) as accordingly modified by 310.15(B)(6).
(a) Termination provisions of equipment for circuits rated 100 amperes or less, or marked for 14 AWG through 1 AWG conductors, shall be used merely for one of the post-obit:
(ane) 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 blueprint letters B, C, or D, conductors having an insulation rating of 75°C (167°F) or higher shall exist permitted to be 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 principal service panel, to either a breaker or lugs in a subpanel. We have to consider the temperature rating of...
- The conductors
- The terminals in the main console where the conductors will connect.
- The terminals in the sub panel where the conductors will connect.
We'll then utilize the lowest value, or threescore°C if any of the in a higher place are not labeled. Once nosotros know the size of the overcurrent devices, and the lowest temperature rating, nosotros can use Table 310.fifteen(B)(xvi) to make up one's mind the conductor size and material we'll demand.
This volition requite us the current carrying conductor size required for our feeder.
But look...
If you're working in a ane-, two-, or multi-family unit dwelling unit, is Article 310.xv(B)(7) applicable?
National Electrical Code 2014
Article 310 Conductors for General Wiring
310.xv Ampacities for Conductors Rated 0–2000 Volts.
(B) Tables. Ampacities for conductors rated 0 to 2000 volts shall be as specified in the Commanded Ampacity Tabular array 310.15(B)(16) through 310.15(B)(xix), and Ampacity Tabular array 310.15(B)(20) and Table 310.15(B)(21) equally modified by (B)(1) through (B)(7).
The temperature correction and adjustment factors shall be permitted to be 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 110.14(C).(7) 120/240-Volt, 3-Wire, Single-Phase Abode Services and Feeders.
(a) For private habitation units of one-family unit, 2-family unit, and multifamily dwellings, conductors, every bit listed in Table 310.15(B)(7), shall be permitted every bit 120/240-volt, single-phase service-entrance conductors and service lateral conductors.
NO.
Discover the codes says
"shall be permitted as 120/240-volt, unmarried-phase service-entrance conductors and service lateral conductors ".
After reading the definition of these terms, it's clear that this does non apply to the wire betwixt the main panel and a subpanel.
Service-Entrance Conductors, Overhead Organisation. The service conductors betwixt the terminals of the service equipment and a point usually exterior the edifice, clear of building walls, where joined by tap or splice to the service drop or overhead service conductors.
Service-Entrance Conductors, Clandestine System. The service conductors between the terminals of the service equipment and the betoken of connection to the service lateral or underground service conductors.
Service Lateral. The hugger-mugger conductors between the utility distribution organization and the service point.
tl;dr
Conductors and all terminals rated at or higher up 75°C.
Utilize 3 AWG copper or 1 AWG aluminium for the current carrying conductors.
Conductors rated at or above 75°C, terminals rated at 60°C or unlabeled.
Use 1 AWG copper or i/0 AWG aluminium for the current conveying conductors.
Conductors and terminals rated at 60°C.
Utilize one AWG copper or one/0 AWG aluminium for the electric current conveying conductors.
Conductors rated at 60°C, terminals rated higher than 60°C
Employ one AWG copper or 1/0 AWG aluminium for the current carrying conductors.
What Size Wire Is Needed To Pull 100 Amps 120',
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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