The ____, including the strip heat and blower motor, is necessary information for calculating loads.

Page 2

Page 3

Table 1 Percent of Cross Section of Conduit and Tubing for Conductors and Cables

Informational Note No. 1: Table 1 is based on common conditions of proper cabling and alignment of conductors where the length of the pull and the number of bends are within reasonable limits. It should be recognized that, for certain conditions, a larger size conduit or a lesser conduit fill should be considered.

Informational Note No. 2: When pulling three conductors or cables into a raceway, if the ratio of the raceway (inside diameter) to the conductor or cable (outside diameter) is between 2.8 and 3.2, jamming can occur. While jamming can occur when pulling four or more conductors or cables into a raceway, the probability is very low.

Notes to Tables

See Informative Annex C for the maximum number of conductors and fixture wires, all of the same size (total cross-sectional area including insulation) permitted in trade sizes of the applicable conduit or tubing.
Table 1 applies only to complete conduit or tubing systems and is not intended to apply to sections of conduit or tubing used to protect exposed wiring and cables from physical damage.
Equipment grounding or bonding conductors, where installed, shall be included when calculating conduit or tubing fill. The actual dimensions of the equipment grounding or bonding conductor (insulated or bare) shall be used in the calculation.
Where conduit or tubing nipples having a maximum length not to exceed 600 mm (24 in.) are installed between boxes, cabinets, and similar enclosures, the nipples shall be permitted to be filled to 60 percent of their total cross-sectional area, and 310.15(C)(1) adjustment factors need not apply to this condition.
For conductors not included in Chapter 9, such as multiconductor cables and optical fiber cables, the actual dimensions shall be used.
For combinations of conductors of different sizes, use actual dimensions or Table 5 and Table 5A for dimensions of conductors and Table 4 for the applicable conduit or tubing dimensions.
When calculating the maximum number of conductors or cables permitted in a conduit or tubing, all of the same size (total cross-sectional area including insulation), the next higher whole number shall be used to determine the maximum number of conductors permitted when the calculation results in a decimal greater than or equal to 0.8. When calculating the size for conduit or tubing permitted for a single conductor, one conductor shall be permitted when the calculation results in a decimal greater than or equal to 0.8.
Where bare conductors are permitted by other sections of this Code, the dimensions for bare conductors in Table 8 shall be permitted.
A multiconductor cable, optical fiber cable, or flexible cord of two or more conductors shall be treated as a single conductor for calculating percentage conduit or tubing fill area. For cables that have elliptical cross sections, the cross-sectional area calculation shall be based on using the major diameter of the ellipse as a circle diameter. Assemblies of single insulated conductors without an overall covering shall not be considered a cable when determining conduit or tubing fill area. The conduit or tubing fill for the assemblies shall be calculated based upon the individual conductors.
The values for approximate conductor diameter and area shown in Table 5 are based on worst-case scenario and indicate round concentric-lay-stranded conductors. Solid and round concentric-lay-stranded conductor values are grouped together for the purpose of Table 5. Round compact-stranded conductor values are shown in Table 5A. If the actual values of the conductor diameter and area are known, they shall be permitted to be used.

Table 2 Radius of Conduit and Tubing Bends

Table 4 Dimensions and Percent Area of Conduit and Tubing (Areas of Conduit or Tubing for the Combinations of Wires Permitted in Table 1, Chapter 9)

Table 5 Dimensions of Insulated Conductors and Fixture Wires

Type	Size (AWG or kcmil)	Approximate Area		Approximate Diameter
mm2	in.2		mm	in.
Type: FFH-2, RFH-1, RFH-2, RFHH-2, RHH, RHW, RHW-2*, RHH, RHW, RHW-2, SF-1, SF-2, SFF-1, SFF-2, TF, TFF, THHW, THW, THW-2, TW, XF, XFF
RFH-2, FFH-2, RFHH-2	18	9.355	0.0145		3.454	0.136
16	11.10	0.0172		3.759	0.148
RHH, RHW, RHW-2	14	18.90	0.0293		4.902	0.193
12	22.77	0.0353		5.385	0.212
10	28.19	0.0437		5.994	0.236
8	53.87	0.0835		8.280	0.326
6	67.16	0.1041		9.246	0.364
4	86.00	0.1333		10.46	0.412
3	98.13	0.1521		11.18	0.440
2	112.9	0.1750		11.99	0.472
1	171.6	0.2660		14.78	0.582
1/0	196.1	0.3039		15.80	0.622
2/0	226.1	0.3505		16.97	0.668
3/0	262.7	0.4072		18.29	0.720
4/0	306.7	0.4754		19.76	0.778
250	405.9	0.6291		22.73	0.895
300	457.3	0.7088		24.13	0.950
350	507.7	0.7870		25.43	1.001
400	556.5	0.8626		26.62	1.048
500	650.5	1.0082		28.78	1.133
600	782.9	1.2135		31.57	1.243
700	874.9	1.3561		33.38	1.314
750	920.8	1.4272		34.24	1.348
800	965.0	1.4957		35.05	1.380
900	1057	1.6377		36.68	1.444
1000	1143	1.7719		38.15	1.502
1250	1515	2.3479		43.92	1.729
1500	1738	2.6938		47.04	1.852
1750	1959	3.0357		49.94	1.966
2000	2175	3.3719		52.63	2.072
SF-2, SFF-2	18	7.419	0.0115		3.073	0.121
16	8.968	0.0139		3.378	0.133
14	11.10	0.0172		3.759	0.148
SF-1, SFF-1	18	4.194	0.0065		2.311	0.091
RFH-1,TF, TFF, XF, XFF	18	5.161	0.0088		2.692	0.106
TF, TFF, XF, XFF	16	7.032	0.0109		2.997	0.118
TW, XF, XFF, THHW, THW, THW-2	14	8.968	0.0139		3.378	0.133
TW, THHW, THW, THW-2	12	11.68	0.0181		3.861	0.152
10	15.68	0.0243		4.470	0.176
8	28.19	0.0437		5.994	0.236
RHH, RHW, RHW-2*	14	13.48	0.0209		4.140	0.163
RHH, RHW, RHW-2*, XF, XFF	12	16.77	0.0260		4.623	0.182
Type: RHH, RHW, RHW-2*, THHN, THHW, THW, THW-2, TFN, TFFN, THWN, THWN-2, XF, XFF
RHH,* RHW,* RHW-2,* XF, XFF	10	21.48	0.0333		5.232	0.206
RHH, RHW, RHW-2*	8	35.87	0.0556		6.756	0.266
TW, THW, THHW, THW-2, RHH, RHW, RHW-2*	6	46.84	0.0726		7.722	0.304
4	62.77	0.0973		8.941	0.352
3	73.16	0.1134		9.652	0.380
2	86.00	0.1333		10.46	0.412
1	122.6	0.1901		12.50	0.492
1/0	143.4	0.2223		13.51	0.532
2/0	169.3	0.2624		14.68	0.578
3/0	201.1	0.3117		16.00	0.630
4/0	239.9	0.3718		17.48	0.688
250	296.5	0.4596		19.43	0.765
300	340.7	0.5281		20.83	0.820
350	384.4	0.5958		22.12	0.871
400	427.0	0.6619		23.32	0.918
500	509.7	0.7901		25.48	1.003
600	627.7	0.9729		28.27	1.113
700	710.3	1.1010		30.07	1.184
750	751.7	1.1652		30.94	1.218
800	791.7	1.2272		31.75	1.250
900	874.9	1.3561		33.38	1.314
1000	953.8	1.4784		34.85	1.372
1250	1200	1.8602		39.09	1.539
1500	1400	2.1695		42.21	1.662
1750	1598	2.4773		45.11	1.776
2000	1795	2.7818		47.80	1.882
TFN, TFFN	18	3.548	0.0055		2.134	0.084
16	4.645	0.0072		2.438	0.096
THHN, THWN, THWN-2	14	6.258	0.0097		2.819	0.111
12	8.581	0.0133		3.302	0.130
10	13.61	0.0211		4.166	0.164
8	23.61	0.0366		5.486	0.216
6	32.71	0.0507		6.452	0.254
4	53.16	0.0824		8.230	0.324
3	62.77	0.0973		8.941	0.352
2	74.71	0.1158		9.754	0.384
1	100.8	0.1562		11.33	0.446
1/0	119.7	0.1855		12.34	0.486
2/0	143.4	0.2223		13.51	0.532
3/0	172.8	0.2679		14.83	0.584
4/0	208.8	0.3237		16.31	0.642
250	256.1	0.3970		18.06	0.711
300	297.3	0.4608		19.46	0.766
Type: FEP, FEPB, PAF, PAFF, PF, PFA, PFAH, PFF, PGF, PGFF, PTF, PTFF, TFE, THHN, THWN, THWN-2, Z, ZF, ZFF, ZHF
THHN, THWN, THWN-2	350	338.2	0.5242		20.75	0.817
400	378.3	0.5863		21.95	0.864
500	456.3	0.7073		24.10	0.949
600	559.7	0.8676		26.70	1.051
700	637.9	0.9887		28.50	1.122
750	677.2	1.0496		29.36	1.156
800	715.2	1.1085		30.18	1.188
900	794.3	1.2311		31.80	1.252
1000	869.5	1.3478		33.27	1.310
PF, PGFF, PGF, PFF, PTF, PAF, PTFF, PAFF	18	3.742	0.0058		2.184	0.086
16	4.839	0.0075		2.489	0.098
PF, PGFF, PGF, PFF, PTF, PAF, PTFF, PAFF, TFE, FEP, PFA, FEPB, PFAH	14	6.452	0.0100		2.870	0.113
TFE, FEP, PFA, FEPB, PFAH	12	8.839	0.0137		3.353	0.132
10	12.32	0.0191		3.962	0.156
8	21.48	0.0333		5.232	0.206
6	30.19	0.0468		6.198	0.244
4	43.23	0.0670		7.417	0.292
3	51.87	0.0804		8.128	0.320
2	62.77	0.0973		8.941	0.352
TFE, PFAH, PFA	1	90.26	0.1399		10.72	0.422
TFE, PFA, PFAH, Z	1/0	108.1	0.1676		11.73	0.462
2/0	130.8	0.2027		12.90	0.508
3/0	158.9	0.2463		14.22	0.560
4/0	193.5	0.3000		15.70	0.618
ZF, ZFF, ZHF	18	2.903	0.0045		1.930	0.076
16	3.935	0.0061		2.235	0.088
Z, ZF, ZFF, ZHF	14	5.355	0.0083		2.616	0.103
Z	12	7.548	0.0117		3.099	0.122
10	12.32	0.0191		3.962	0.156
8	19.48	0.0302		4.978	0.196
6	27.74	0.0430		5.944	0.234
4	40.32	0.0625		7.163	0.282
3	55.16	0.0855		8.382	0.330
2	66.39	0.1029		9.195	0.362
1	81.87	0.1269		10.21	0.402
Type: KF-1, KF-2, KFF-1, KFF-2, XHH, XHHW, XHHW-2, ZW
XHHW, ZW, XHHW-2, XHH	14	8.968	0.0139		3.378	0.133
12	11.68	0.0181		3.861	0.152
10	15.68	0.0243		4.470	0.176
8	28.19	0.0437		5.994	0.236
6	38.06	0.0590		6.960	0.274
4	52.52	0.0814		8.179	0.322
3	62.06	0.0962		8.890	0.350
2	73.94	0.1146		9.703	0.382
XHHW, XHHW-2, XHH	1	98.97	0.1534		11.23	0.442
1/0	117.7	0.1825		12.24	0.482
2/0	141.3	0.2190		13.41	0.528
3/0	170.5	0.2642		14.73	0.58
4/0	206.3	0.3197		16.21	0.638
250	251.9	0.3904		17.91	0.705
300	292.6	0.4536		19.30	0.76
350	333.3	0.5166		20.60	0.811
400	373.0	0.5782		21.79	0.858
500	450.6	0.6984		23.95	0.943
600	561.9	0.8709		26.75	1.053
700	640.2	0.9923		28.55	1.124
750	679.5	1.0532		29.41	1.158
800	717.5	1.1122		30.23	1.190
900	796.8	1.2351		31.85	1.254
1000	872.2	1.3519		33.32	1.312
1250	1108	1.7180		37.57	1.479
1500	1300	2.0156		40.69	1.602
1750	1492	2.3127		43.59	1.716
2000	1682	2.6073		46.28	1.822
KF-2, KFF-2	18	2.000	0.003		1.575	0.062
16	2.839	0.0043		1.88	0.074
14	4.129	0.0064		2.286	0.090
12	6.000	0.0092		2.743	0.108
10	8.968	0.0139		3.378	0.133
KF-1, KFF-1	18	1.677	0.0026		1.448	0.057
16	2.387	0.0037		1.753	0.069
14	3.548	0.0055		2.134	0.084
12	5.355	0.0083		2.616	0.103
10	8.194	0.0127		3.226	0.127
*Types RHH, RHW, and RHW-2 without outer covering.

Table 5A Compact Copper and Aluminum Building Wire Nominal Dimensions** and Areas

Size (AWG or kcmil)	Bare Conductor	Types RHH*	Types THW and THHW	Type THHN	Type XHHW	Size (AWG or kcmil)
Diameter	Approximate Diameter	Approximate Area	Approximate Diameter	Approximate Area	Approximate Diameter	Approximate Area	Approximate Diameter	Approximate Area
mm	in.	mm	in.	mm2	in.2	mm	in.	mm2	in.2	mm	in.	mm2	in.2	mm	in.	mm2	in.2
8	3.404	0.134	6.604	0.260	34.25	0.0531	6.477	0.255	32.90	0.0510	—	—	—	—	5.690	0.224	25.42	0.0394	8
6	4.293	0.169	7.493	0.295	44.10	0.0683	7.366	0.290	42.58	0.0660	6.096	0.240	29.16	0.0452	6.604	0.260	34.19	0.0530	6
4	5.410	0.213	8.509	0.335	56.84	0.0881	8.509	0.335	56.84	0.0881	7.747	0.305	47.10	0.0730	7.747	0.305	47.10	0.0730	4
2	6.807	0.268	9.906	0.390	77.03	0.1194	9.906	0.390	77.03	0.1194	9.144	0.360	65.61	0.1017	9.144	0.360	65.61	0.1017	2
1	7.595	0.299	11.81	0.465	109.5	0.1698	11.81	0.465	109.5	0.1698	10.54	0.415	87.23	0.1352	10.54	0.415	87.23	0.1352	1
1/0	8.534	0.336	12.70	0.500	126.6	0.1963	12.70	0.500	126.6	0.1963	11.43	0.450	102.6	0.1590	11.43	0.450	102.6	0.1590	1/0
2/0	9.550	0.376	13.72	0.540	147.8	0.2290	13.84	0.545	150.5	0.2332	12.57	0.495	124.1	0.1924	12.45	0.490	121.6	0.1885	2/0
3/0	10.74	0.423	14.99	0.590	176.3	0.2733	14.99	0.590	176.3	0.2733	13.72	0.540	147.7	0.2290	13.72	0.540	147.7	0.2290	3/0
4/0	12.07	0.475	16.26	0.640	207.6	0.3217	16.38	0.645	210.8	0.3267	15.11	0.595	179.4	0.2780	14.99	0.590	176.3	0.2733	4/0
250	13.21	0.520	18.16	0.715	259.0	0.4015	18.42	0.725	266.3	0.4128	17.02	0.670	227.4	0.3525	16.76	0.660	220.7	0.3421	250
300	14.48	0.570	19.43	0.765	296.5	0.4596	19.69	0.775	304.3	0.4717	18.29	0.720	262.6	0.4071	18.16	0.715	259.0	0.4015	300
350	15.65	0.616	20.57	0.810	332.3	0.5153	20.83	0.820	340.7	0.5281	19.56	0.770	300.4	0.4656	19.30	0.760	292.6	0.4536	350
400	16.74	0.659	21.72	0.855	370.5	0.5741	21.97	0.865	379.1	0.5876	20.70	0.815	336.5	0.5216	20.32	0.800	324.3	0.5026	400
500	18.69	0.736	23.62	0.930	438.2	0.6793	23.88	0.940	447.7	0.6939	22.48	0.885	396.8	0.6151	22.35	0.880	392.4	0.6082	500
600	20.65	0.813	26.29	1.035	542.8	0.8413	26.67	1.050	558.6	0.8659	25.02	0.985	491.6	0.7620	24.89	0.980	486.6	0.7542	600
700	22.28	0.877	27.94	1.100	613.1	0.9503	28.19	1.110	624.3	0.9676	26.67	1.050	558.6	0.8659	26.67	1.050	558.6	0.8659	700
750	23.06	0.908	28.83	1.135	652.8	1.0118	29.21	1.150	670.1	1.0386	27.31	1.075	585.5	0.9076	27.69	1.090	602.0	0.9331	750
900	25.37	0.999	31.50	1.240	779.3	1.2076	31.09	1.224	759.1	1.1766	30.33	1.194	722.5	1.1196	29.69	1.169	692.3	1.0733	900
1000	26.92	1.060	32.64	1.285	836.6	1.2968	32.64	1.285	836.6	1.2968	31.88	1.255	798.1	1.2370	31.24	1.230	766.6	1.1882	1000
*Types RHH and RHW without outer coverings.
**Dimensions are from industry sources.

Table 8 Conductor Properties

Size (AWG or kcmil)	Area	Conductors	Direct-Current Resistance at 75°C (167°F)
Stranding	Overall	Copper
	Diameter	Diameter	Area	Uncoated	Coated	Aluminum
mm2	Circular mils	Quantity	mm	in.	mm	in.	mm2	in.2	ohm/km	ohm/kFT	ohm/km	ohm/kFT	ohm/km	ohm/kFT
18	0.823	1620	1	—	—	1.02	0.040	0.823	0.001	25.5	7.77	26.5	8.08	42.0	12.8
18	0.823	1620	7	0.39	0.015	1.16	0.046	1.06	0.002	26.1	7.95	27.7	8.45	42.8	13.1
16	1.31	2580	1	—	—	1.29	0.051	1.31	0.002	16.0	4.89	16.7	5.08	26.4	8.05
16	1.31	2580	7	0.49	0.019	1.46	0.058	1.68	0.003	16.4	4.99	17.3	5.29	26.9	8.21
14	2.08	4110	1	—	—	1.63	0.064	2.08	0.003	10.1	3.07	10.4	3.19	16.6	5.06
14	2.08	4110	7	0.62	0.024	1.85	0.073	2.68	0.004	10.3	3.14	10.7	3.26	16.9	5.17
12	3.31	6530	1	—	—	2.05	0.081	3.31	0.005	6.34	1.93	6.57	2.01	10.45	3.18
12	3.31	6530	7	0.78	0.030	2.32	0.092	4.25	0.006	6.50	1.98	6.73	2.05	10.69	3.25
10	5.261	10380	1	—	—	2.588	0.102	5.26	0.008	3.984	1.21	4.148	1.26	6.561	2.00
10	5.261	10380	7	0.98	0.038	2.95	0.116	6.76	0.011	4.070	1.24	4.226	1.29	6.679	2.04
8	8.367	16510	1	—	—	3.264	0.128	8.37	0.013	2.506	0.764	2.579	0.786	4.125	1.26
8	8.367	16510	7	1.23	0.049	3.71	0.146	10.76	0.017	2.551	0.778	2.653	0.809	4.204	1.28
6	13.30	26240	7	1.56	0.061	4.67	0.184	17.09	0.027	1.608	0.491	1.671	0.510	2.652	0.808
4	21.15	41740	7	1.96	0.077	5.89	0.232	27.19	0.042	1.010	0.308	1.053	0.321	1.666	0.508
3	26.67	52620	7	2.20	0.087	6.60	0.260	34.28	0.053	0.802	0.245	0.833	0.254	1.320	0.403
2	33.62	66360	7	2.47	0.097	7.42	0.292	43.23	0.067	0.634	0.194	0.661	0.201	1.045	0.319
1	42.41	83690	19	1.69	0.066	8.43	0.332	55.80	0.087	0.505	0.154	0.524	0.160	0.829	0.253
1/0	53.49	105600	19	1.89	0.074	9.45	0.372	70.41	0.109	0.399	0.122	0.415	0.127	0.660	0.201
2/0	67.43	133100	19	2.13	0.084	10.62	0.418	88.74	0.137	0.3170	0.0967	0.329	0.101	0.523	0.159
3/0	85.01	167800	19	2.39	0.094	11.94	0.470	111.9	0.173	0.2512	0.0766	0.2610	0.0797	0.413	0.126
4/0	107.2	211600	19	2.68	0.106	13.41	0.528	141.1	0.219	0.1996	0.0608	0.2050	0.0626	0.328	0.100
250	127	—	37	2.09	0.082	14.61	0.575	168	0.260	0.1687	0.0515	0.1753	0.0535	0.2778	0.0847
300	152	—	37	2.29	0.090	16.00	0.630	201	0.312	0.1409	0.0429	0.1463	0.0446	0.2318	0.0707
350	177	—	37	2.47	0.097	17.30	0.681	235	0.364	0.1205	0.0367	0.1252	0.0382	0.1984	0.0605
400	203	—	37	2.64	0.104	18.49	0.728	268	0.416	0.1053	0.0321	0.1084	0.0331	0.1737	0.0529
500	253	—	37	2.95	0.116	20.65	0.813	336	0.519	0.0845	0.0258	0.0869	0.0265	0.1391	0.0424
600	304	—	61	2.52	0.099	22.68	0.893	404	0.626	0.0704	0.0214	0.0732	0.0223	0.1159	0.0353
700	355	—	61	2.72	0.107	24.49	0.964	471	0.730	0.0603	0.0184	0.0622	0.0189	0.0994	0.0303
750	380	—	61	2.82	0.111	25.35	0.998	505	0.782	0.0563	0.0171	0.0579	0.0176	0.0927	0.0282
800	405	—	61	2.91	0.114	26.16	1.030	538	0.834	0.0528	0.0161	0.0544	0.0166	0.0868	0.0265
900	456	—	61	3.09	0.122	27.79	1.094	606	0.940	0.0470	0.0143	0.0481	0.0147	0.0770	0.0235
1000	507	—	61	3.25	0.128	29.26	1.152	673	1.042	0.0423	0.0129	0.0434	0.0132	0.0695	0.0212
1250	633	—	91	2.98	0.117	32.74	1.289	842	1.305	0.0338	0.0103	0.0347	0.0106	0.0554	0.0169
1500	760	—	91	3.26	0.128	35.86	1.412	1011	1.566	0.02814	0.00858	0.02814	0.00883	0.0464	0.0141
1750	887	—	127	2.98	0.117	38.76	1.526	1180	1.829	0.02410	0.00735	0.02410	0.00756	0.0397	0.0121
2000	1013	—	127	3.19	0.126	41.45	1.632	1349	2.092	0.02109	0.00643	0.02109	0.00662	0.0348	0.0106
Notes: 1. These resistance values are valid only for the parameters as given. Using conductors having coated strands, different stranding type, and, especially, other temperatures changes the resistance.
2. Equation for temperature change: R2 = R1 [1 + a (T2—75)], where αcu = 0.00323, αAL = 0.00330 at 75°C.
3. Conductors with compact and compressed stranding have about 9 percent and 3 percent, respectively, smaller bare conductor diameters than those shown. See Table 5A for actual compact cable dimensions.
4. The IACS conductivities used: bare copper = 100%, aluminum = 61%.
5. Class B stranding is listed as well as solid for some sizes. Its overall diameter and area are those of its circumscribing circle.
Informational Note: The construction information is in accordance with NEMA WC/70-2009 or ANSI/UL 1581-2017.
The resistance is calculated in accordance with National Bureau of Standards Handbook 100, dated 1966, and Handbook 109, dated 1972.

Table 9 Alternating-Current Resistance and Reactance for 600-Volt Cables, 3-Phase, 60 Hz, 75°C (167°F) — Three Single Conductors in Conduit

Size (AWG or kcmil)	Ohms to Neutral per Kilometer Ohms to Neutral per 1000 Feet	Size (AWG or kcmil)
XL (Reactance) for All Wires	Alternating-Current Resistance for Uncoated Copper Wires	Alternating-Current Resistance for Aluminum Wires	Effective Z at 0.85 PF for Uncoated Copper Wires	Effective Z at 0.85 PF for Aluminum Wires
PVC, Aluminum Conduits	Steel Conduit	PVC Conduit	Aluminum Conduit	Steel Conduit	PVC Conduit	Aluminum Conduit	Steel Conduit	PVC Conduit	Aluminum Conduit	Steel Conduit	PVC Conduit	Aluminum Conduit	Steel Conduit
14	0.190	0.240	10.2	10.2	10.2	—	—	—	8.9	8.9	8.9	—	—	—	14
0.058	0.073	3.1	3.1	3.1	—	—	—	2.7	2.7	2.7	—	—	—
12	0.177	0.223	6.6	6.6	6.6	10.5	10.5	10.5	5.6	5.6	5.6	9.2	9.2	9.2	12
0.054	0.068	2.0	2.0	2.0	3.2	3.2	3.2	1.7	1.7	1.7	2.8	2.8	2.8
10	0.164	0.207	3.9	3.9	3.9	6.6	6.6	6.6	3.6	3.6	3.6	5.9	5.9	5.9	10
0.050	0.063	1.2	1.2	1.2	2.0	2.0	2.0	1.1	1.1	1.1	1.8	1.8	1.8
8	0.171	0.213	2.56	2.56	2.56	4.3	4.3	4.3	2.26	2.26	2.30	3.6	3.6	3.6	8
0.052	0.065	0.78	0.78	0.78	1.3	1.3	1.3	0.69	0.69	0.70	1.1	1.1	1.1
6	0.167	0.210	1.61	1.61	1.61	2.66	2.66	2.66	1.44	1.48	1.48	2.33	2.36	2.36	6
0.051	0.064	0.49	0.49	0.49	0.81	0.81	0.81	0.44	0.45	0.45	0.71	0.72	0.72
4	0.157	0.197	1.02	1.02	1.02	1.67	1.67	1.67	0.95	0.95	0.98	1.51	1.51	1.51	4
0.048	0.060	0.31	0.31	0.31	0.51	0.51	0.51	0.29	0.29	0.30	0.46	0.46	0.46
3	0.154	0.194	0.82	0.82	0.82	1.31	1.35	1.31	0.75	0.79	0.79	1.21	1.21	1.21	3
0.047	0.059	0.25	0.25	0.25	0.40	0.41	0.40	0.23	0.24	0.24	0.37	0.37	0.37
2	0.148	0.187	0.62	0.66	0.66	1.05	1.05	1.05	0.62	0.62	0.66	0.98	0.98	0.98	2
0.045	0.057	0.19	0.20	0.20	0.32	0.32	0.32	0.19	0.19	0.20	0.30	0.30	0.30
1	0.151	0.187	0.49	0.52	0.52	0.82	0.85	0.82	0.52	0.52	0.52	0.79	0.79	0.82	1
0.046	0.057	0.15	0.16	0.16	0.25	0.26	0.25	0.16	0.16	0.16	0.24	0.24	0.25
1/0	0.144	0.180	0.39	0.43	0.39	0.66	0.69	0.66	0.43	0.43	0.43	0.62	0.66	0.66	1/0
0.044	0.055	0.12	0.13	0.12	0.20	0.21	0.20	0.13	0.13	0.13	0.19	0.20	0.20
2/0	0.141	0.177	0.33	0.33	0.33	0.52	0.52	0.52	0.36	0.36	0.36	0.52	0.52	0.52	2/0
0.043	0.054	0.10	0.10	0.10	0.16	0.16	0.16	0.11	0.11	0.11	0.16	0.16	0.16
3/0	0.138	0.171	0.253	0.269	0.259	0.43	0.43	0.43	0.289	0.302	0.308	0.43	0.43	0.46	3/0
0.042	0.052	0.077	0.082	0.079	0.13	0.13	0.13	0.088	0.092	0.094	0.13	0.13	0.14
4/0	0.135	0.167	0.203	0.220	0.207	0.33	0.36	0.33	0.243	0.256	0.262	0.36	0.36	0.36	4/0
0.041	0.051	0.062	0.067	0.063	0.10	0.11	0.10	0.074	0.078	0.080	0.11	0.11	0.11
250	0.135	0.171	0.171	0.187	0.177	0.279	0.295	0.282	0.217	0.230	0.240	0.308	0.322	0.33	250
0.041	0.052	0.052	0.057	0.054	0.085	0.090	0.086	0.066	0.070	0.073	0.094	0.098	0.10
300	0.135	0.167	0.144	0.161	0.148	0.233	0.249	0.236	0.194	0.207	0.213	0.269	0.282	0.289	300
0.041	0.051	0.044	0.049	0.045	0.071	0.076	0.072	0.059	0.063	0.065	0.082	0.086	0.088
350	0.131	0.164	0.125	0.141	0.128	0.200	0.217	0.207	0.174	0.190	0.197	0.240	0.253	0.262	350
0.040	0.050	0.038	0.043	0.039	0.061	0.066	0.063	0.053	0.058	0.060	0.073	0.077	0.080
400	0.131	0.161	0.108	0.125	0.115	0.177	0.194	0.180	0.161	0.174	0.184	0.217	0.233	0.240	400
0.040	0.049	0.033	0.038	0.035	0.054	0.059	0.055	0.049	0.053	0.056	0.066	0.071	0.073
500	0.128	0.157	0.089	0.105	0.095	0.141	0.157	0.148	0.141	0.157	0.164	0.187	0.200	0.210	500
0.039	0.048	0.027	0.032	0.029	0.043	0.048	0.045	0.043	0.048	0.050	0.057	0.061	0.064
600	0.128	0.157	0.075	0.092	0.082	0.118	0.135	0.125	0.131	0.144	0.154	0.167	0.180	0.190	600
0.039	0.048	0.023	0.028	0.025	0.036	0.041	0.038	0.040	0.044	0.047	0.051	0.055	0.058
750	0.125	0.157	0.062	0.079	0.069	0.095	0.112	0.102	0.118	0.131	0.141	0.148	0.161	0.171	750
0.038	0.048	0.019	0.024	0.021	0.029	0.034	0.031	0.036	0.040	0.043	0.045	0.049	0.052
1000	0.121	0.151	0.049	0.062	0.059	0.075	0.089	0.082	0.105	0.118	0.131	0.128	0.138	0.151	1000
0.037	0.046	0.015	0.019	0.018	0.023	0.027	0.025	0.032	0.036	0.040	0.039	0.042	0.046
Notes: 1. These values are based on the following constants: UL-Type RHH wires with Class B stranding, in cradled configuration. Wire conductivities are 100 percent IACS copper and 61 percent IACS aluminum, and aluminum conduit is 45 percent IACS. Capacitive reactance is ignored, since it is negligible at these voltages. These resistance values are valid only at 75°C (167°F) and for the parameters as given, but are representative for 600-volt wire types operating at 60 Hz.
2. Effective Z is defined as R cos(θ) + X sin(θ), where θ is the power factor angle of the circuit. Multiplying current by effective impedance gives a good approximation for line-to-neutral voltage drop. Effective impedance values shown in this table are valid only at 0.85 power factor. For another circuit power factor (PF), effective impedance (Ze) can be calculated from R and XL values given in this table as follows: Ze = R × PF + XLsin[arccos(PF)].

Table 10 Conductor Stranding

Conductor Size	Number of Strands
Copper	Aluminum
AWG or kcmil	mm2	Class Ba	Class C	Class Ba
24—30	0.20—0.05	b	—	—
22	0.32	7	—	—
20	0.52	10	—	—
18	0.82	16	—	—
16	1.3	26	—	—
14—2	2.1—33.6	7	19	7c
1—4/0	42.4—107	19	37	19
250—500	127—253	37	61	37
600—1000	304—508	61	91	61
1250—1500	635—759	91	127	91
1750—2000	886—1016	127	271	127
aConductors with a lesser number of strands shall be permitted based on an evaluation for connectability and bending.
bNumber of strands vary.
cAluminum 14 AWG (2.1 mm2) is not available.
With the permission of Underwriters Laboratories, Inc., material is reproduced from UL Standard 486A-B, Wire Connectors, which is copyrighted by Underwriters Laboratories, Inc., Northbrook, Illinois. While use of this material has been authorized, UL shall not be responsible for the manner in which the information is presented, nor for any interpretations thereof. For more information on UL or to purchase standards, please visit our Standards website at www.comm-2000.com or call 1-888-853-3503.

Table 11(A) and Table 11(B)

For listing purposes, Table 11(A) and Table 11(B) provide the required power source limitations for Class 2 and Class 3 power sources. Table 11 (A) applies for alternating-current sources, and Table 11(B) applies for direct-current sources.

The power for Class 2 and Class 3 circuits shall be either (1) inherently limited, requiring no overcurrent protection, or (2) not inherently limited, requiring a combination of power source and overcurrent protection. Power sources designed for interconnection shall be listed for the purpose.

As part of the listing, the Class 2 or Class 3 power source shall be durably marked where plainly visible to indicate the class of supply and its electrical rating. A Class 2 power source not suitable for wet location use shall be so marked.

Overcurrent devices, where required, shall be located at the point where the conductor to be protected receives its supply and shall not be interchangeable with devices of higher ratings. The overcurrent device shall be permitted as an integral part of the power source.

Table 11(A) Class 2 and Class 3 Alternating-Current Power Source Limitations

Power Source	Inherently Limited Power Source (Overcurrent Protection Not Required)	Not Inherently Limited Power Source (Overcurrent Protection Required)
Class 2	Class 3	Class 2	Class 3
Source voltage Vmax (volts)(see Note 1)	0 through 20*	Over 20 and through 30*	Over 30 and through 150	Over 30 and through 100	0 through 20*	Over 20 and through 30*	Over 30 and through 100	Over 100 and through 150
Power limitations VAmax (volt-amperes)(see Note 1)	—	—	—	—	250 (see Note 3)	250	250	N.A.
Current limitations Imax (amperes)(see Note 1)	8.0	8.0	0.005	150/Vmax	1000/Vmax	1000/Vmax	1000/Vmax	1.0
Maximum overcurrent protection (amperes)	—	—	—	—	5.0	100/Vmax	100/Vmax	1.0
Power source maximum nameplate rating	VA (volt-amperes)	5.0 × Vmax	100	0.005 × Vmax	100	5.0 × Vmax	100	100	100
Current (amperes)	5.0	100/Vmax	0.005	100/Vmax	5.0	100/Vmax	100/Vmax	100/Vmax
Note: Notes for this table can be found following Table 11(B).
*Voltage ranges shown are for sinusoidal ac in indoor locations or where wet contact is not likely to occur. For nonsinusoidal or wet contact conditions, see Note 2.

Table 11(B) Class 2 and Class 3 Direct-Current Power Source Limitations

Power Source	Inherently Limited Power Source (Overcurrent Protection Not Required)	Not Inherently Limited Power Source (Overcurrent Protection Required)
Class 2	Class 3	Class 2	Class 3
Source voltage Vmax (volts)(see Note 1)	0 through 20*	Over 20 and through 30*	Over 30 and through 60*	Over 60 and through 150	Over 60 and through 100	0 through 20*	Over 20 and through 60*	Over 60 and through 100	Over 100 and through 150
Power limitations VA max (volt-amperes)(see Note 1)	—	—	—	—	—	250 (see Note 3)	250	250	N.A.
Current limitations Imax (amperes)(see Note 1)	8.0	8.0	150/Vmax	0.005	150/Vmax	1000/Vmax	1000/Vmax	1000/Vmax	1.0
Maximum overcurrent protection (amperes)	—	—	—	—	—	5.0	100/Vmax	100/Vmax	1.0
Power source maximum nameplate rating	VA (volt-amperes)	5.0 × Vmax	100	100	0.005 × Vmax	100	5.0 × Vmax	100	100	100
Current (amperes)	5.0	100/Vmax	100/Vmax	0.005	100/Vmax	5.0	100/Vmax	100/Vmax	100/Vmax
*Voltage ranges shown are for continuous dc in indoor locations or where wet contact is not likely to occur.
For interrupted dc or wet contact conditions, see Note 4.
Notes for Table 11(A) and Table 11(B)
1. Vmax, Imax, and VAmax are determined with the current-limiting impedance in the circuit (not bypassed) as follows:
Vmax:Maximum output voltage regardless of load with rated input applied.
Imax: Maximum output current under any noncapacitive load, including short circuit, and with overcurrent protection bypassed if used. Where a transformer limits the output current, Imax limits apply after 1 minute of operation. Where a current-limiting impedance, listed for the purpose, or as part of a listed product, is used in combination with a non-power-limited transformer or a stored energy source, e.g., storage battery, to limit the output current, Imax limits apply after 5 seconds.
VAmax: Maximum volt-ampere output after 1 minute of operation regardless of load and overcurrent protection bypassed if used.
2. For nonsinusoidal ac, Vmax shall not be greater than 42.4 volts peak. Where wet contact (immersion not included) is likely to occur, Class 3 wiring methods shall be used or Vmax shall not be greater than 15 volts for sinusoidal ac and 21.2 volts peak for nonsinusoidal ac.
3. If the power source is a transformer, VAmax is 350 or less when Vmax is 15 or less.
4. For dc interrupted at a rate of 10 to 200 Hz, Vmax shall not be greater than 24.8 volts peak. Where wet contact (immersion not included) is likely to occur, Class 3 wiring methods shall be used, or Vmax shall not be greater than 30 volts for continuous dc; 12.4 volts peak for dc that is interrupted at a rate of 10 to 200 Hz.

Table 12(A) and Table 12(B)

For listing purposes, Table 12(A) and Table 12(B) provide the required power source limitations for power-limited fire alarm sources. Table 12(A) applies for alternating-current sources, and Table 12(B) applies for direct-current sources. The power for power-limited fire alarm circuits shall be either (1) inherently limited, requiring no overcurrent protection, or (2) not inherently limited, requiring the power to be limited by a combination of power source and overcurrent protection.

As part of the listing, the PLFA power source shall be durably marked where plainly visible to indicate that it is a power-limited fire alarm power source. The overcurrent device, where required, shall be located at the point where the conductor to be protected receives its supply and shall not be interchangeable with devices of higher ratings. The overcurrent device shall be permitted as an integral part of the power source.

Table 12(A) PLFA Alternating-Current Power Source Limitations

Power Source	Inherently Limited Power Source (Overcurrent Protection Not Required)	Not Inherently Limited Power Source (Overcurrent Protection Required)
Circuit voltage Vmax (volts)(see Note 1)	0 through 20	Over 20 and through 30	Over 30 and through 100	0 through 20	Over 20 and through 100	Over 100 and through 150
Power limitations VAmax(volt-amperes)(see Note 1)	—	—	—	250 (see Note 2)	250	N.A.
Current limitations Imax (amperes)(see Note 1)	8.0	8.0	150/Vmax	1000/Vmax	1000/Vmax	1.0
Maximum overcurrent protection (amperes)	—	—	—	5.0	100/Vmax	1.0
Power source maximum nameplate ratings	VA (volt-amperes)	5.0 × Vmax	100	100	5.0 × Vmax	100	100
Current (amperes)	5.0	100/Vmax	100/Vmax	5.0	100/Vmax	100/Vmax
Note: Notes for this table can be found following Table 12(B).

Table 12(B) PLFA Direct-Current Power Source Limitations

Power Source	Inherently Limited Power Source (Overcurrent Protection Not Required)	Not Inherently Limited Power Source (Overcurrent Protection Required)
Circuit voltage Vmax (volts)(see Note 1)	0 through 20	Over 20 and through 30	Over 30 and through 100	0 through 20	Over 20 and through 100	Over 100 and through 150
Power limitations VAmax (volt-amperes)(see Note 1)	—	—	—	250 (see Note 2)	250	N.A.
Current limitations I max (amperes)(see Note 1)	8.0	8.0	150/Vmax	1000/Vmax	1000/Vmax	1.0
Maximum overcurrent protection (amperes)	—	—	—	5.0	100/Vmax	1.0
Power source maximum nameplate ratings	VA (volt- amperes)	5.0 × Vmax	100	100	5.0 × Vmax	100	100
Current (amperes)	5.0	100/Vmax	100/Vmax	5.0	100/Vmax	100/Vmax
Notes for Table 12(A) and Table 12(B)
1. V max, I max, and VA max are determined as follows: V max: Maximum output voltage regardless of load with rated input applied.
I max: Maximum output current under any noncapacitive load, including short circuit, and with overcurrent protection bypassed if used. Where a transformer limits the output current, I max limits apply after 1 minute of operation. Where a current-limiting impedance, listed for the purpose, is used in combination with a non-power-limited transformer or a stored energy source, e.g., storage battery, to limit the output current, I max limits apply after 5 seconds.
VA max: Maximum volt-ampere output after 1 minute of operation regardless of load and overcurrent protection bypassed if used. Current limiting impedance shall not be bypassed when determining I max and VA max.
2. If the power source is a transformer, VA max is 350 or less when V max is 15 or less.