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ADCP-80-570 • Issue 2 • March 2006
Page 32
© 2006, ADC Telecommunications, Inc.
* Unless otherwise specifically permitted in the code, as defined in the NEC document cited
(ANSI/NEC 70), the overcurrent protection for conductor types marked with an asterisk (*)
shall not exceed 15 amperes for No. 14, 20 amperes for No. 12, and 30 amperes for No. 10
copper, after any correction factors for ambient temperature and number of conductors have
been applied.
500 320 380 430
600 355 420 475
700 385 460 520
750 400 335 380
800 410 490 555
900 435 520 585
1000 455 545 615
1250 495 590 665
1500 520 625 705
1750 545 650 735
2000 560 665 750
CORRECTION FACTORS
For ambient temperatures other than 30C (86F), multiply
the allowable ampacities shown by the appropriate factor shown below.
21-25 1.08 1.05 1.04
26-30 1.00 1.00 1.00
31-35 .91 .94 .96
36-40 .82 .88 .91
41-45 .71 .82 .87
46-50 .58 .75 .82
51-55 .41 .67 .76
56-60 .... .58 .71
61-70 .... .33 .58
71-80 .... .... .41
Table 310-16 (NEC): Allowable Ampacities of Insulated Conductors, Rated O Through 2000 Volts, 60° to
90°C (140° to 194°F), Not More Than Three Current-Carrying Conductors in Raceway or Cable or Earth
(Directly Buried), Based on Ambient Temperature of 30°C (86°F)
SIZE TEMPERATURE RATING OF CONDUCTOR
AWG
KCMIL
60°C
(114°F)
60°C
(114°F)
60°C
(114°F)
TYPES
TW*,
UF*
TYPES
FEPW*,
RH*, RHW*,
THHW*,
THW*,
THWN*,
XHHW*,
USE*, ZW*
TYPES
TBS, SA,
SIS, FEP*,
FEPB*, MI,
RHH*, RHW-2,
THHN*,
THHW*, THW-2*,
THWN-2*,
USE-2,
XHH,
XHHW*
XHHW-2
ZW-2