Allowable amps for electric vehicle charging cables used with J1772 plugs

[Brian Weltman]

Hi,

I was researching the allowable amperages.  The allowable amps for permanent (ie normal residential commercial) wiring given in the tables indicates lower allowable amps as compared to the newer standards for testing electric vehicle charging cables.  This is what I found:    

UL APPROVAL

  600 VOLT TYPE EVT

  300 VOLT TYPE EVJT

STANDARDS: UL standard 62 NEC articles 400 and 625

MECHANICAL Passes cold bend requirements for UL62 Bend radius 7 x cable OD minimum

  Oil, chemical, sunlight and water resistant

ELECTRICAL CURRENT CAPACITITY BY GAUGE SIZE

  14 AWG 16 AMP

  10 AWG 30 AMP

   8 AWG 31 TO 74 AMP

   6 AWG 75 TO 99 AMP

I will post more as I find it.

[Nick Sayer]

Ampacity of electric wire can vary depending on the temperature rating of the insulation. The NEC recognizes 3 different ampacities for 10 gauge stranded copper wire with 60 degree, 75 degree and 90 degree insulation. For 60 degree, it's 30 amps, but for 90 degrees it's 40. Some J1772 cables come with 105 degree insulation. The net result is that if you get a UL registered J1772 plug/cable set, it will have an ampacity rating for charging (no need to derate as you would for your supply circuit) that you can directly use as a maximum.

[lincomatic]

I think those values only apply to EVT/EVJT cables. It would not be wise to apply those ampacities to other wire types (SOOW, THHN, etc). Look for a table pertaining to the exact type of cable you’re working with. The ampacity varies w/ insulation type, temperature range, etc.

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