- Location
- Mission Viejo, CA
- Occupation
- Professional Electrical Engineer
1.) NEC Section/Paragraph: 110.14(C)(1)
2.) Proposal Recommends: Replace existing text as follows
3.) Proposal:
[ May 05, 2005, 10:15 AM: Message edited by: rbalex ]
2.) Proposal Recommends: Replace existing text as follows
3.) Proposal:
4.) Substantiation:110.14 (C) Ampacity and Temperature Limitations of Electrical Connections. The ampacity of a conductor shall be selected and coordinated so as not to exceed the ampacity or temperature rating of any connecting device or equipment terminal it is connected to [Edit Add:] or the temperature rating of any material or equipment it is in contact with.
(1) Provisions for 0-600V Connecting Devices or Equipment Terminals. Temperature limitations of conductors, required by 0-600V rated connecting devices or equipment terminals, shall be based on 110.14(C) (1) (a), (b) or (c). Unless marked otherwise, the conductor ampacity at a connecting device or equipment terminal shall be based on Table 310.16 without further adjustment except as required by the appropriate ambient correction factor of the conductor.
(a) Connecting devices or equipment terminals rated 100 amperes or less, or marked for conductors 14 AWG through 1 AWG, shall be used only for one of the following:
(1) Conductors with temperature ratings of 60?C (140?F)
(2) Conductors with higher temperature ratings, provided the ampacity of such conductors at the connecting device or equipment terminal is limited to the ampacity of a 60?C (140?F) temperature rated conductor of the same size
(3) Conductors with higher temperature ratings if the connecting device or the equipment terminal and host equipment is identified for use with such conductors
(b) Terminations rated over 100 amperes, or marked for conductors larger than 1 AWG, shall be used only for one of the following:
(1) Conductors with temperature ratings not more than 75?C (167?F)
(2) Conductors with higher temperature ratings, provided the ampacity of such conductors at the connecting device or equipment terminal is limited to the ampacity of a 75?C (167?F) temperature rated conductor of the same size
(3) Conductors with higher temperature ratings if the connecting device or the equipment terminal and host equipment is identified for use with such conductors
(c) For motors marked with NEMA design letters B, C, or D, field terminated conductors shall have a temperature rating not more than 75?C (167?F) or conductors with higher temperature ratings shall be permitted to be used provided the ampacity at the termination of such conductors is limited to the ampacity of a 75?C (167?F) temperature rated conductor of the same size.
Note to the Forum: Be GentleThis Subsection is still widely misunderstood and needs clarification that these are ampacity and temperature limitations solely at the connections.
In the context of the Primary Section (110.14) the purpose of this Subsection is to define the appropriate temperature limitations of conductors at connections. The temperature limitations of the conductors in other conditions of use are appropriately defined in Section 310.10 and other parts of Article 310. It is important to note no additional adjustments are required by a connection itself unless marked otherwise, but ambient conditions are to be considered.
A coordinating Proposal is being made to Section 310.15(A)(2) [ Selection of Ampacity ]to specifically recognize 110.14(C) and that the Exception 310.15(A)(2)does not apply to it.
The revised text also notifies the user that both the host equipment and it terminals must be identified for a higher temperature ratings.
Termination devices in 110.14(C)(2) are both amp and temperature rated so ampacity restrictions are also recognized in the 110.14(C) general statement.
Non-listed NEMA rated motors are identified as the basis for 110.14(C)(1)(c)
[ May 05, 2005, 10:15 AM: Message edited by: rbalex ]