NEC 2008 article 110.14(1) states:
(a) Termination provisions of equipment for circuits rated 100A or less, or marked for 14 AWG through 1 AWG conductors, shall be used only for one of the following:
(1) conductors rated 60 deg
(2) conductors with higher temperature ratings, provided the ampacity of such conductors is determined baased on the 60 deg ampacity of the conductor sized used.
My understanding is that for ampacity less than 100A or wire size #14-1, we suppose to use the 60 deg column regardless the wire type. If need to adjust to different temperature, we will then use the temperature adjustment factor. I, however, have seen many questions that acutally used the 75 deg column for wires in the rage of #14-1. One example is EERM sample test #30. Any thought on this?
(a) Termination provisions of equipment for circuits rated 100A or less, or marked for 14 AWG through 1 AWG conductors, shall be used only for one of the following:
(1) conductors rated 60 deg
(2) conductors with higher temperature ratings, provided the ampacity of such conductors is determined baased on the 60 deg ampacity of the conductor sized used.
My understanding is that for ampacity less than 100A or wire size #14-1, we suppose to use the 60 deg column regardless the wire type. If need to adjust to different temperature, we will then use the temperature adjustment factor. I, however, have seen many questions that acutally used the 75 deg column for wires in the rage of #14-1. One example is EERM sample test #30. Any thought on this?