Emerson 30-130 kVA installation manual Copper Aluminum or Copper-Clad Aluminum

Table 3 Table 310-16

Allowable Ampacities of Insulated Conductors Rated 0-2000 Volts, 60° to 90°C (140° to 194°F)1

Not More than Three Conductors in Raceway or Cable or Earth (Directly Buried), based on Ambient Temperature of 30° (86°F)

Size		Temperature Rating of Conductor. See Table 310-13.					Size
	60°C	75°C	90°C	60°C	75°C	90°C
	(140°F)	(167°F)	(194°F)	(140°F)	(167°F)	(194°F)
	Types	Types	Types	Types	Types	Types
	TW*	FEPW*,	TBS, SA, SIS	TW*	RH*, RHW*,	TBS, SA, SIS,
AWG	UF*	RH, RHW*,	FEP*, FEPB*, MI,	UF*	THHW*,	THHN*, THHW*,	AWG
		THHW*,	RHH*, RHW-2,		THW*,	THW-2, THWN-2,
kcmil							kcmil
		THW*,	THHN*, THHW*,		THWN*,	RHH*, RHW-2,
		THWN*,	THW-2, THWN-2,		XHHW*,	USE-2,
		XHHW*,	USE-2, XHH, XHHW*		USE*	XHH, XHHW*,
		USE*, ZW*	XHHW-2, ZW-2			XHHW-2, ZW-2

		Copper		Aluminum or Copper-Clad Aluminum
18	.......	.......	14	.......	.......	.......	.......
16	.......	.......	18	.......	.......	.......	.......
14	20†	20†	25†	.......	.......	.......	.......
12	25†	25†	30†	20†	20†	25†	12
10	30	35†	40†	25	30†	35†	10
8	40	50	55	30	40	45	8
6	55	65	75	40	50	60	6
4	70	85	95	55	65	75	4
3	85	100	110	65	75	85	3
2	95	115	130	75	90	100	2
1	110	130	150	85	100	115	1
1/0	125	150	170	100	120	135	1/0
2/0	145	175	195	115	135	150	2/0
3/0	165	200	225	130	155	175	3/0
4/0	195	230	260	150	180	205	4/0
250	215	255	290	170	205	230	250
300	240	285	320	190	230	255	300
350	260	310	350	210	250	280	350
400	280	335	380	225	270	305	400
500	320	380	430	260	310	350	500
600	355	420	475	285	340	385	600
700	385	460	520	310	375	420	700
750	400	475	535	320	385	435	750
800	410	490	555	330	395	450	800
900	435	520	585	355	425	480	900
1000	455	545	615	375	445	500	1000
1250	495	590	665	405	485	545	1250
1500	520	625	705	435	520	585	1500
1750	545	650	735	455	545	615	1750
2000	560	665	750	470	560	630	2000

Correction Factors

Ambient	For ambient temperatures other than 30°C (86°F), multiply the allowable ampacities shown							Ambient
Temp °C			above by the appropriate factor shown below.					Temp °F
21-25	1.08	1.05		1.04	1.08	1.05	1.04	70-77
26-30	1.00	1.00		1.00	1.00	1.00	1.00	78-86
31-35	.91	.94		.96	.91	.94	.96	87-95
36-40	.82	.88		.91	.82	.88	.91	96-104
41-45	.71	.82		.87	.71	.82	.87	105-113
46-50	.58	.75		.82	.58	.75	.82	114-122
51-55	.41	.67		.76	.41	.67	.76	123-131
56-60	.......	.58		.71	.......	.58	.71	132-140
61-70	.......	.33		.58	.......	.33	.58	141-158
71-80	.......	.......		.41	.......	.......	.41	159-176

* Unless otherwise specifically permitted elsewhere in this Code, 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; or 15 amperes for No.12 and 25 amperes for No. 10 aluminum and copper-clad aluminum after any correction factors for ambient temperature and number of conductors have been applied.

1 Reprinted with permission from NEC 1999, NFPA 70, the National Electrical Code®, Copyright 1998, National Fire Protection Association, Quincy, MA 02269. This reprinted material is not the complete and official position of the National Fire Protection Association, on the referenced subject which is represented only by the standard in its entirety.

Wiring Inspection 29