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27
Cable connection and wiring
Input wiring shall be sized according to all applicable local and national requirements considering all
factors including cable length, ambient temperature, etc.
Input wiring must be sized according to the required branch circuit rating as determined from the
above table.
Recommend minimum conductor sizes for connection from main panel based on 30° C Ambient from
NEC Table 310.16 are as follows:
Branch circuit and
Breaker Rating
75°C Copper
Types RHW, THHW, THW,
THWN, XHHW, USE, ZW
90°C Copper
Types TBS, SA, SIS, FEP, FEPB, MI,
RHH, RHW-2, THHN, THHW, THW-
2, THWN-2, USE-2, XHH, XHHW,
XHHW-2, ZW-2
15A 14 AWG 14 AWG
20A 12 AWG 12 AWG
25A 12 AWG 12 AWG
30A 10 AWG 10 AWG
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