Temperature Ratings for Conductor Materials
Conductor*
(Radix designations shown in parentheses) |
Maximum Temperature
Rating, °C |
|
|
Bare Copper (BC)* |
200 |
|
Tinned Copper (TC)* |
200 |
|
Nickel-Plated Copper (NPC)** |
250 |
|
Nickel-Coated Copper (NCC)** |
550 |
|
Silver-Plated Copper (SPC) |
200 |
|
Nickel-Plated Iron (NPI) |
250 |
|
Nickel (NA) |
550 |
* For 200 C rating, individual strands of bare or tinned copper must be 0.015-inch (AWG #26) or larger. AWG #30 (0.010-inch) cannot be rated at 200 C in bare or tinned copper. It must be protected with a nickel or silver-plating.
**NPC is 2% nickel, and NCC 27% nickel, by weight of conductor.