Table A.18

60 Hz Characteristics of Three-Conductor Shielded Paper-Insulated Cables

Voltage Class	Insulation Thickness (mils)	Circular Miles or AWG (B & S)	Type of Conductorf	Weight/1000 ft	Diameter or Sector Depthb (in.)	Resistance (Ω/mi)a	GMR of One Conductorc (in.)	Positive and Negative Sequences			Zero Sequence			Sheath
Voltage Class	Insulation Thickness (mils)	Circular Miles or AWG (B & S)	Type of Conductorf	Weight/1000 ft	Diameter or Sector Depthb (in.)	Resistance (Ω/mi)a	GMR of One Conductorc (in.)	Series Reactance (Ω/mi)	Shunt Capacitive Reactance (Ω/mi)	GMR—Three Conductors	Series Resistance (Ω/mi)d	Series Reactance (Ω/mi)d	Shunt Capacitive Reactance (Ω/mils)e	Thickness (mi)	Resistance (Ω/mi) at 50°C
15 kV	205	4	SR	3,860	0.232	1.58	0.084	0.248	8200	0.328	5.15	0.325	8200	105	1.19
	190	2	SR	4,260	0.292	0.987	0.106	0.226	6700	0.365	4.44	0.298	6700	105	1.15
	185	1	SR	4,740	0.332	0.786	0.126	0.210	6000	0.398	3.91	0.285	6000	110	1.04
	180	0	SR	5,090	0.373	0.622	0.141	0.201	5400	0.425	3.65	0.275	5400	110	1.01
	175	00	CS	4,790	0.323	0.495	0.151	0.178	5200	0.397	3.95	0.268	5200	105	1.15
	175	000	CS	5,510	0.364	0.392	0.171	0.170	4800	0.432	3.48	0.256	4800	110	1.03
	175	0000	CS	6,180	0.417	0.310	0.191	0.166	4400	0.468	3.24	0.249	4400	110	0.975
	175	250,000	CS	6,910	0.455	0.263	0.210	0.158	4100	0.498	2.95	0.243	4100	115	0.897
	175	300,000	CS	7,610	0.497	0.220	0.230	0.156	3800	0.530	2.80	0.237	3800	115	0.860
	175	350,000	CS	8,480	0.539	0.190	0.249	0.153	3600	0.561	2.53	0.233	3600	120	0.783
	175	400,000	CS	9,170	0.572	0.166	0.265	0.151	3400	0.585	2.45	0.228	3400	120	0.761
	175	500,000	CS	10,710	0.642	0.134	0.297	0.146	3100	0.636	2.19	0.222	3100	125	0.684
	175	600,000	CS	12,230	0.700	0.113	0.327	0.143	2900	0.681	1.98	0.215	2900	130	0.623
	175	750,000	CS	14,380	0.780	0.091	0.366	0.139	2600	0.737	1.78	0.211	2600	135	0.562
23 kV	265	2	SR	5,590	0.292	0.987	0.106	0.250	8300	0.418	3.60	0.317	8300	115	0.870
	250	1	SR	5,860	0.332	0.786	0.126	0.232	7500	0.450	3.26	0.298	7500	115	0.851
	250	0	SR	6,440	0.373	0.622	0.141	0.222	8800	0.477	2.99	0.290	6800	120	0.788
	240	00	CS	6,060	0.323	0.495	0.151	0.196	6600	0.446	3.16	0.285	6600	115	0.890
	240	000	CS	6,620	0.364	0.392	0.171	0.188	6000	0.480	2.95	0.285	6000	115	0.851
	240	0000	CS	7,480	0.410	0.310	0.191	0.181	5600	0.515	2.64	0.268	5800	120	0.775
	240	250,000	CS	8,070	0.447	0.263	0.210	0.177	5200	0.545	2.50	0.261	5200	120	0.747
	240	300,000	CS	8,990	0.490	0.220	0.230	0.171	4900	0.579	2.29	0.252	4900	125	0.690
	240	350,000	CS	9,720	0.532	0.190	0.249	0.167	4600	0.610	2.10	0.249	4600	125	0.665
	240	400,000	CS	10,650	0.566	0.166	0.265	0.165	4400	0.633	2.03	0.240	4400	130	0.620
	240	500,000	CS	12,280	0.635	0.134	0.297	0.159	3900	0.687	1.82	0.237	3900	135	0.562
	240	600,000	CS	13,610	0.690	0.113	0.327	0.154	3700	0.730	1.73	0.230	3700	135	0.540
	240	750,000	CS	15,830	0.767	0.091	0.366	0.151	3400	0.787	1.56	0.225	3400	140	0.488
35 kV	355	0	SR	8,520	0.288	0.622	0.141	0.239	9900	0.523	2.40	0.330	9900	130	0.594
	345	00	SR	9,180	0.323	0.495	0.159	0.226	9100	0.548	2.17	0.322	9100	135	0.559
	345	000	SR	9,900	0.364	0.392	0.178	0.217	8500	0.585	2.01	0.312	8500	135	0.538
	345	0000	CS	9,830	0.410	0.310	0.191	0.204	7200	0.594	2.00	0.290	7200	135	0.563
	345	250,000	CS	10,470	0.447	0.263	0.210	0.197	6800	0.628	1.90	0.280	6800	135	0.545
	345	300,000	CS	11,290	0.490	0.220	0.230	0.191	6400	0.663	1.80	0.273	6400	135	0.527
	345	350,000	CS	12,280	0.532	0.190	0.249	0.187	6000	0.693	1.66	0.270	6000	140	0.491
	345	400,000	CS	13,030	0.566	0.166	0.265	0.183	5700	0.721	1.61	0.265	5700	140	0.480
	345	500,000	CS	14,760	0.635	0.134	0.297	0.177	5200	0.773	1.46	0.257	5200	145	0.441
	345	600,000	CS	16,420	0.690	0.113	0.327	0.171	4900	0.819	1.35	0.248	4900	150	0.412
	345	750,000	CS	18,860	0.767	0.091	0.366	0.165	4500	0.879	1.22	0.243	4500	155	0.377

Source: Westinghouse Electric Corporation, Electrical Transmission and Distribution Reference Book, East Pittsburgh, PA, 1964.

a AC resistance based on 100% conductivity at 65°C including 2% allowance for stranding.

b Geometric mean radius (GMR) of sector-shaped conductors is an approximate figure close enough for most practical applications.

c Dielectric constant = 3.7.

d Based on all return current in the sheath; none in ground.

e See Figure 7, p. 67, of Ref. [1].

f The following symbols are used to designate the conductor types: SR, stranded round; CS, compact sector.

Table A.19

60 Hz Characteristics of Three-Conductor Oil-Filled Paper-Insulated Cables

Voltage Class	Insulation Thickness (mils)	Circular Miles or AWG (B & S)	Type of Conductorf	Weight/1000 ft	Diameter or Sector Depthe(in.)	Resistance (Ω/mi)a	GMR of One Conductorb (in.)	Positive and Negative Sequences		GMR—Three Conductors	Zero Sequence			Sheath
Voltage Class	Insulation Thickness (mils)	Circular Miles or AWG (B & S)	Type of Conductorf	Weight/1000 ft	Diameter or Sector Depthe(in.)	Resistance (Ω/mi)a		Series Reactance (Ω/mi)	Shunt Capacitive Reactancec (Ω/mi)	GMR—Three Conductors	Series Resistance (Ω/mi)d	Series Reactance (Ω/mi)d	Shunt Capacitive Reactance (Ω/mi)c	Thickness (mils)	Resistance (.../mi) at 50°V
35 kV	190	00	CS	5,590	0.323	0.495		0.151	0.185	6030	0.406	3.56	0.265	6030	115	1.02
		000	CS	6,150	0.364	0.392	0.171	0.178	5480	0.439	3.30	0.256	5480	115	0.970
		0000	CS	6,860	0.417	0.310	0.191	0.172	4840	0.478	3.06	0.243	4840	115	0.918
		250,000	CS	7,680	0.455	0.263	0.210	0.168	4570	0.508	2.72	0.238	4570	125	0.820
		300,000	CS	9,090	0.497	0.220	0.230	0.164	4200	0.539	2.58	0.232	4200	125	0.788
		350,000	CS	9,180	0.539	0.190	0.249	0.160	3900	0.570	2.44	0.227	3900	125	0.752
		400,000	CS	9,900	0.572	0.166	0.265	0.157	3690	0.595	2.35	0.223	3690	125	0.729
		500,000	CS	11,550	0.642	0.134	0.297	0.153	3400	0.646	2.04	0.217	3400	135	0.636
		600,000	CS	12,900	0.700	0.113	0.327	0.150	3200	0.691	1.94	0.210	3200	135	0.608
		750,000	CS	15,660	0.780	0.091	0.366	0.148	3070	0.763	1.73	0.202	3070	140	0.548
46 kV	225	00	CS	6,360	0.323	0.495	0.151	0.195	6700	0.436	3.28	0.272	6700	115	0.928
		000	CS	6,940	0.364	0.392	0.171	0.188	6100	0.468	2.87	0.265	6100	125	0.826
		0000	CS	7,660	0.410	0.310	0.191	0.180	5520	0.503	2.67	0.256	5520	125	0.788
		250,000	CS	8,280	0.447	0.263	0.210	0.177	5180	0.533	2.55	0.247	5180	125	0.761
		300,000	CS	9,690	0.490	0.220	0.230	0.172	4820	0.566	2.41	0.241	4820	125	0.729
		350,000	CS	10,100	0.532	0.190	0.249	0.168	4490	0.596	2.16	0.237	4400	135	0.658
		400,000	CS	10,820	0.566	0.166	0.265	0.165	4220	0.623	2.08	0.232	4220	135	0.639
		500,000	CS	12,220	0.635	0.134	0.297	0.160	3870	0.672	1.94	0.226	3870	135	0.603
		600,000	CS	13,930	0.690	0.113	0.327	0.156	3670	0.718	1.74	0.219	3670	140	0.542
		750,000	CS	16,040	0.767	0.091	0.366	0.151	3350	0.773	1.62	0.213	3350	140	0.510
		1,000,000	CS
69 kV	315	00	CR	8,240	0.370	0.495	0.147	0.234	8330	0.532	2.41	0.290	8330	135	0.639
		000	CS	8,830	0.364	0.392	0.171	0.208	7560	0.538	2.32	0.284	7560	135	0.642
		0000	CS	9,660	0.410	0.310	0.191	0.200	6840	0.575	2.16	0.274	6840	135	0.618
		250,000	CS	10,330	0.447	0.263	0.210	0.195	6500	0.607	2.06	0.266	6500	135	0.597
		300,000	CS	11,540	0.490	0.220	0.230	0.190	6030	0.640	1.85	0.260	6030	140	0.543
		350,000	CS	12,230	0.532	0.190	0.249	0.185	5700	0.672	1.77	0.254	5700	140	0.527
		400,000	CS	13,040	0.566	0.166	0.205	0.181	5430	0.700	1.55	0.248	5430	140	0.513
		500,000	CS	14,880	0.635	0.134	0.297	0.176	5050	0.750	1.51	0.242	5050	150	0.460
		600,000	CS	16,320	0.690	0.113	0.327	0.171	4740	0.797	1.44	0.235	4740	150	0.442
		750,000	CS	18,980	0.767	0.091	0.366	0.165	4360	0.854	1.29	0.230	4360	155	0.399
		1,000,000

Source: Westinghouse Electric Corporation, Electrical Transmission and Distribution Reference Book, East Pittsburgh, PA, 1964.

a AC resistance based on 100% conductivity at 65°C, including 2% allowance for stranding.

b GMR of sector-shaped conductors is an approximate figure close enough for most practical applications.

c Dielectric constant = 3.5.

d Based on all return current in sheath, none in ground.

e See Figure 7, p. 67, of Ref. [1].

f The following symbols are used to designate the cable types: CR, compact round; CS, compact sector.

Table A.20

60 Hz Characteristics of Single-Conductor Concentric-Strand Paper-Insulated Cables

						Xa	Za	ra	ra
Voltage Class	Insulation Thickness (mils)	Circular Mils or AWG (B & S)	Weight/1000 ft	Diameter of Conductor (in.)	GMR of One Conductora (in.)	Reactance at 12 in. (Ω/Phase/mi)	Reactance of Sheath (Ω/Phase/mi)	Resistance of One Conductor (Ω/Phase/mi)a	Resistance of Sheath (Ω/Phase/mi) at 50°C	Shunt Capacitive Reactancec (Ω/Phase/mi)b	Lead Sheath Thickness (mils)
1 kV	60	6	560	0.184	0.067	0.628	0.489	2.50	6.20	4040	75
	60	4	670	0.232	0.084	0.602	0.475	1.58	5.56	3360	75
	60	2	880	0.292	0.106	0.573	0.458	0.987	4.55	2760	80
	60	1	990	0.332	0.126	0.552	0.450	0.786	4.25	2490	80
	60	0	1110	0.373	0.141	0.539	0.442	0.622	3.61	2250	80
	60	00	1270	0.418	0.159	0.524	0.434	0.495	3.34	2040	80
	60	000	1510	0.470	0.178	0.512	0.425	0.392	3.23	1840	85
	60	0000	1740	0.528	0.200	0.496	0.414	0.310	2.98	1650	85
	60	250,000	1930	0.575	0.221	0.484	0.408	0.263	2.81	1530	85
	60	350,000	2490	0.681	0.262	0.464	0.392	0.190	2.31	1300	90
	60	500,000	3180	0.814	0.313	0.442	0.378	0.134	2.06	1090	90
	60	750,000	4380	0.998	0.385	0.417	0.358	0.091	1.65	885	95
	60	1,000,000	5560	1.152	0.445	0.400	0.344	0.070	1.40	800	100
	60	1,500,000	8000	1.412	0.543	0.374	0.319	0.050	1.05	645	110
	60	2,000,000	10,190	1.632	0.633	0.356	0.305	0.041	0.894	555	115
3 kV	75	6	600	0.184	0.067	0.628	0.481	2.50	5.80	4810	75
	75	4	720	0.232	0.084	0.602	0.467	1.58	5.23	4020	75
	75	2	930	0.292	0.106	0.573	0.453	0.987	4.31	3300	80
	75	1	1040	0.332	0.126	0.552	0.445	0.786	4.03	2990	80
	75	0	1170	0.373	0.141	0.539	0.436	0.622	3.79	2670	80
	75	00	1320	0.418	0.159	0.524	0.428	0.495	3.52	2450	80
	75	000	1570	0.470	0.178	0.512	0.420	0.392	3.10	2210	85
	75	0000	1800	0.528	0.200	0.496	0.412	0.310	2.87	2010	85
	75	250,000	1990	0.575	0.221	0.484	0.403	0.263	2.70	1860	85
	75	350,000	2550	0.681	0.262	0.464	0.389	0.190	2.27	1610	90
	75	500,000	3340	0.814	0.313	0.442	0.375	0.134	1.89	1340	95
	75	750,000	4570	0.998	0.385	0.417	0.352	0.091	1.53	1060	100
	75	1,000,000	5640	1.152	0.445	0.400	0.341	0.070	1.37	980	100
	75	1,500,000	8090	1.412	0.543	0.374	0.316	0.050	1.02	805	110
	75	2,000,000	10,300	1,632	0,633	0.356	0.302	0.041	0.877	685	115
15 kV	220	4	1340	0.232	0.084	0.602	0.412	1.58	2.91	8580	85
	215	2	1500	0.292	0.106	0.573	0.406	0.987	2.74	7270	85
	210	1	1610	0.332	0.126	0.552	0.400	0.786	2.64	6580	85
	200	0	1710	0.373	0.141	0.539	0.397	0.622	2.59	5880	85
	195	00	1940	0.418	0.159	0.524	0.391	0.495	2.32	5290	90
	185	000	2100	0.470	0.178	0.512	0.386	0.392	2.24	4680	90
	180	0000	2300	0.528	0.200	0.496	0.380	0.310	2.14	4200	90
	175	250,000	2500	0.575	0.221	0.484	0.377	0.263	2.06	3820	90
	175	350,000	3110	0.681	0.262	0.464	0.366	0.190	1.98	3340	95
	175	500,000	3940	0.814	0.313	0.442	0.352	0.134	1.51	2870	100
	175	750,000	5240	0.998	0.385	0.417	0.336	0.091	1.26	2420	105
	175	1,000,000	6350	1.152	0.445	0.400	0.325	0.070	1.15	2130	105
	175	1,500,000	8810	1.412	0.546	0.374	0.305	0.050	0.90	1790	115
	175	2,000,000	11,080	1.632	0.633	0.356	0.294	0.041	0.772	1570	120
23 kV	295	2	1920	0.292	0.106	0.573	0.383	0.987	2.16	8890	90
	285	1	2010	0.332	0.126	0.552	0.380	0.786	2.12	8050	90
	275	0	2120	0.373	0.141	0.539	0.377	0.622	2.08	7300	90
	265	00	2250	0.418	0.159	0.524	0.375	0.495	2.02	6580	90
	260	000	2530	0.470	0.178	0.512	0.370	0.392	1.85	6000	95
	250	0000	2740	0.528	0.200	0.496	0.366	0.310	1.78	5350	95
	245	250,000	2930	0.575	0.221	0.484	0.361	0.263	1.72	4950	95
	240	350,000	3550	0.681	0.262	0.464	0.352	0.190	1.51	4310	100
	240	500,000	4300	0.814	0.313	0.442	0.341	0.134	1.38	3720	100
	240	750,000	5630	0.998	0.385	0.417	0.325	0.091	1.15	3170	105
	240	1,000,000	6910	1.152	0.445	0.400	0.313	0.070	1.01	2800	110
	240	1,500,000	9460	1.412	0.546	0.374	0.296	0.050	0.806	2350	120
	240	2,000,000	11,790	1.632	0.633	0.356	0.285	0.041	0.697	2070	125
5 kV	120	6	740	0.184	0.067	0.628	0.456	2.50	4.47	6700	80
	115	4	890	0.232	0.084	0.573	0.447	1.58	4.17	5540	80
	110	2	1040	0.292	0.106	0.573	0.439	0.987	3.85	4520	80
	110	1	1160	0.332	0.126	0.552	0.431	0.786	3.62	4100	80
	105	0	1270	0.373	0.141	0.539	0.425	0.622	3.47	3600	80
	100	00	1520	0.418	0.159	0.524	0.420	0.495	3.09	3140	85
	100	000	1710	0.470	0.178	0.512	0.412	0.392	2.91	2860	85
	95	0000	1870	0.525	0.200	0.496	0.406	0.310	2.74	2480	85
	90	250,000	2080	0.575	0.221	0.484	0.400	0.263	2.62	2180	85
	90	350,000	2620	0.681	0.262	0.464	0.386	0.190	2.20	1890	90
	90	500,000	3410	0.814	0.313	0.442	0.396	0.134	1.85	1610	95
	90	750,000	4650	0.998	0.385	0.417	0.350	0.091	1.49	1360	100
	90	1,000,000	5850	1.152	0.445	0.400	0.339	0.070	1.27	1140	105
	90	1,500,000	8160	1.412	0.543	0.374	0.316	0.050	1.02	950	110
	90	2,000,000	10,370	1.632	0.663	0.356	0.302	0.041	0.870	820	115
8 kV	150	6	890	0.184	0.067	0.628	0.431	2.50	3.62	7780	80
	150	4	1010	0.232	0.084	0.602	0.425	1.58	3.$2	6660	85
	140	2	1150	0.292	0.106	0.573	0.417	0.987	3.06	5400	85
	140	1	1330	0.332	0.126	0.552	0.411	0.786	2.91	4920	85
	135	0	1450	0.373	0.141	0.539	0.408	0.622	2.83	4390	85
	130	00	1590	0.418	0.159	0.524	0.403	0.495	2.70	3890	85
	125	000	1760	0.470	0.178	0.512	0.397	0.392	2.59	3440	85
	120	0000	1980	0.528	0.200	0.496	0.389	0.310	2.29	3020	90
	120	250,000	2250	0.575	0.221	0.484	0.383	0.263	2.18	2790	90
	115	350,000	2730	0.681	0.262	0.464	0.375	0.190	1.90	2350	95
	115	500,000	3530	0.814	0.313	0.442	0.361	0.134	1.69	2010	95
	115	750,000	4790	0.998	0.385	0.417	0.341	0.091	1.39	1670	100
	115	1,000,000	6000	1.152	0.415	0.400	0.330	0.070	1.25	1470	105
	115	1,500,000	8250	1.412	0.543	0.374	0.310	0.050	0.975	1210	110
	115	2,000,000	10,480	1.632	0.663	0.356	0.297	0.041	0.797	1055	120
35 kV	395	0	2900	0.373	0.141	0.539	0.352	0.622	1.51	9150	100
	385	00	3040	0.418	0.159	0.524	0.350	0.495	1.48	8420	100
	370	000	3190	0.470	0.178	0.512	0.347	0.392	1.46	7620	100
	355	0000	3380	0.528	0.200	0.496	0.344	0.310	1.43	6870	100
	350	250,000	3590	0.575	0.221	0.484	0.342	0.263	1.39	6410	100
	345	350,000	4230	0.681	0.262	0.464	0.366	0.190	1.24	5640	105
	345	500,000	5040	0.814	0.313	0.442	0.325	0.134	1.15	4940	105
	345	750,000	5430	0.998	0.385	0.417	0.311	0.091	0.975	4250	110
	345	1,000,000	7780	1.152	0.445	0.400	0.302	0.070	0.866	3780	115
	345	1,500,000	10,420	1.412	0.546	0.374	0.285	0.050	0.700	3210	125
	345	2,000,000	12,830	1.632	0.633	0.356	0.274	0.041	0.811	2830	130
46 kV	475	000	3910	0.470	0.178	0.512	0.331	0.392	1.20	8890	105
	460	0000	4080	0.528	0.200	0.496	0.329	0.310	1.19	8100	105
	450	250,000	4290	0.575	0.221	0.484	0.326	0.263	1.16	7570	105
	445	350,000	4990	0.681	0.262	0.464	0.319	0.190	1.05	6720	110
	445	500,000	5820	0.814	0.313	0.442	0.310	0.134	0.930	5950	115
	445	750,000	7450	0.998	0.385	0.417	0.298	0.091	0.807	5130	120
	445	1,000,000	8680	1.152	0.445	0.400	0.290	0.070	0.752	4610	120
	445	1,500,000	11,420	1.412	0.546	0.374	0.275	0.050	0.615	3930	130
	445	2,000,000	13,910	1.632	0.633	0.356	0.264	0.041	0.543	3520	135
69 kV	650	350,000	6720	0.681	0.262	0.464	0.292	0.190	0.773	8590	120
	650	500,000	7810	0.814	0.313	0.442	0.284	0.134	0.695	7680	125
	650	750,000	9420	0.998	0.385	0.417	0.275	0.091	0.615	6700	130
	650	1,000,000	10,940	1.152	0.445	0.400	0.267	0.070	0.557	6060	135
	650	1,500,000	13,680	1.412	0.546	0.374	0.258	0.050	0.488	5250	140
	650	2,000,000	16,320	1.632	0.633	0.356	0.246	0.041	0.437	4710	145

Source: Westinghouse Electric Corporation, Electrical Transmission and Distribution Reference Book, East Pittsburgh, PA, 1964.

a Conductors are standard concentric-stranded, not compact round.

b AC resistance based on 100% conductivity at 65°C including 2% allowance for stranding.

c Dielectric constant = 3.7.

Table A.21

			Inside Diameter of Spring Core = 0.5 in.												Inside Diameter of Spring Core = 0.5 in.
						Xa	Xa	Tc	Ra									Xz	Xa	Tc	Ra
Voltage Class	Insulation Thickness (mils)	Circular Mils or AWG (B & S)	Weight/1000 ft	Diameter of Conductor (in.)	GMR of One Conductora (in.)	Reactance at 12 in. (Ω/Phase/mi)	Reactance of Sheath (Ω/Phase/mi)	Resistance of One Conductor (Ω/Phase/mi)a	Resistance of Sheath (Ω/Phase/mi) at 50°C	Shunt Capacitive Reactancec (Ω/Phase/mi)b	Lead Sheath Thickness (mils)	Voltage Class	Insulation Thickness (mils)	Circular Mils or AWG (B & S)	Weight/1000 ft	Diameter of Conductor (in.)	GMR of One Conductora (in.)	Reactance at 12 in. (Ω/Phase/mi)	Reactance of Sheath (Ω/Phase/mi)	Resistance of One Conductor (Ω/Phase/mi)a	Resistance of Sheath (Ω/Phase/mi) at 50°C	Shunt Capacitive Reactancec (Ω/Phase/mi)c	Lead Sheath Thickness (mils)
69 kV	315	00	3,980	0.736	0.345	0.431	0.333	0.495	1.182	5240	110	69 kV	315	000	4860	0.924	0.439	0.399	0.320	0.392	1.007	4450	115
		000	4,090	0.768	0.356	0.427	0.331	0.392	1.157	5070	110			0000	5090	0.956	0.450	0.398	0.317	0.310	0.985	4350	115
		0000	4,320	0.807	0.373	0.421	0.328	0.310	1.130	4900	110			250,000	5290	0.983	0.460	0.396	0.315	0.263	0.975	4230	115
		250,000	4,650	0.837	0.381	0.418	0.325	0.263	1.057	4790	115			350,000	5950	1.050	0.483	0.390	0.310	0.188	0.897	4000	120
		350,000	5,180	0.918	0.408	0.410	0.320	0.188	1.009	4470	115			500,000	6700	1.145	0.516	0.382	0.304	0.132	0.850	3700	120
		500,000	6,100	1.028	0.448	0.399	0.312	0.133	0.905	4070	120			750,000	8080	1.286	0.550	0.374	0.295	0.089	0.759	3410	125
		750,000	7,310	1.180	0.505	0.384	0.302	0.089	0.838	3620	120			1,000,000	9440	1.416	0.612	0.360	0.288	0.067	0.688	3140	130
		1,000,000	8,630	1.310	0.550	0.374	0.294	0.068	0.752	3380	125			1,500,000	11,970	1.635	0.692	0.346	0.276	0.047	0.601	2750	135
		1 $$ 000	11,090	1.547	0.639	0.356	0.281	0.048	0.649	2920	130			2,000,000	14,450	1.835	0.763	0.334	0.266	0.038	0.533	2510	140
		2,000,000	13,750	1.760	0.716	0.342	0.270	0.039	0.550	2570	140	115 kV	480	0000	6590	0.956	0.450	0.398	0.295	0.310	0.760	5950	125
115 kV	480	0000	5720	0.807	0.373	0.421	0.305	0.310	0.805	6650	120			250,000	6800	0.983	0.460	0.396	0.294	0.263	0.752	5790	125
		250,000	5930	0.837	0.381	0.418	0.303	0.263	0.793	6500	120			350,000	7340	1.050	0.483	0.390	0.290	0.188	0.729	5540	125
		350,000	6390	0.918	0.408	0.410	0.298	0.188	0.730	6090	125			500,000	8320	1.145	0.516	0.382	0.284	0.132	0.669	5150	130
		500,000	7480	1.028	0.448	0.399	0.291	0.133	0.692	5600	125			750,000	9790	1.286	0.550	0.374	0.277	0.089	0.606	4770	135
		750,000	8950	1.180	0.505	0.381	0.283	0.089	0.625	5040	130			1,000,000	11,060	1.416	0.612	0.360	0.270	0.067	0.573	4430	135
		1,000,000	10,350	1.310	0.550	0.374	0.276	0.068	0.568	4700	135			1,500,000	13,900	1.635	0.692	0.346	0.260	0.047	0.490	3920	145
		1,500,000	12,960	1.547	0.639	0.356	0.265	0.048	0.500	4110	140			2,000,000	16,610	1.835	0.763	0.334	0.251	0.038	0.440	3580	150
		2,000,000	15,530	1.760	0.716	0.342	0.255	0.039	0.447	3710	145	138 kV	560	0000	7390	0.956	0.450	0.398	0.786	0.310	0.678	6590	130
138 kV	560	0000	6480	0.807	0.373	0.421	0.205	0.310	0.758	7410	125			250,000	7610	0.983	0.460	0.396	0.285	0.263	0.669	6480	130
		250,000	6700	0.837	0.381	0.418	0.293	0.263	0.746	7240	125			350,000	8170	1.050	0.483	0.390	0.281	0.188	0.649	6180	130
		350,000	7460	0.918	0.408	0.410	0.288	0.188	0.690	6820	130			500,000	9180	1.145	0.516	0.382	0.276	0.132	0.601	5790	135
		500,000	8310	1.028	0.448	0.399	0.282	0.133	0.658	6260	130			750,000	10,660	1.286	0.550	0.374	0.269	0.089	0.545	5320	140
		750,000	9800	1.180	0.505	0.384	0.274	0.089	0.592	5680	135			1,000,000	12,010	1.416	0.612	0.360	0.263	0.067	0.519	4940	140
		1,000,000	11,270	1.310	0.550	0.374	0.268	0.068	0.541	5240	140			1,500,000	14,450	1.635	0.692	0.346	0.253	0.047	0.462	4460	145
		1,500,000	13720	1.547	0.639	0.356	0.257	0.048	0.477	4670	145			2,000,000	16,820	1.835	0.763	0.334	0.245	0.038	0.404	4060	155
		2,000,000	16080	1.760	0.716	0.342	0.248	0.039	0.427	4170	150	161 kV	650	250,000	8560	0.983	0.460	0.396	0.275	0.263	0.596	7210	135
161 kV	650	250,000	7600	0.837	0.381	0.418	0.283	0.263	0.660	7980	130			350,000	9140	1.050	0.483	0.390	0.272	0.188	0.580	6860	135
		350,000	8390	0.918	0.408	0.410	0.279	0.188	0.611	7520	135			500,000	10,280	1.145	0.516	0.382	0.267	0.132	0.537	6430	140
		500,000	9270	1.028	0.448	0.399	0.273	0.133	0.585	6980	135			750,000	11,770	1.286	0.550	0.374	0.261	0.089	0.492	5980	145
		750,000	10,840	1.180	0.505	0.384	0.266	0.089	0.532	6320	140			1,000,000	13,110	1.416	0.612	0.360	0.255	0.067	0.469	5540	145
		1,000,000	12,340	1.310	0.550	0.374	0.259	0.068	0.483	5880	145			1,500,000	15,840	1.635	0.692	0.346	0.246	0.047	0.421	4980	150
		1,500,000	15,090	1.547	0.639	0.356	0.246	0.048	0.433	5190	150			2,000,000	18,840	1.835	0.763	0.334	0.238	0.038	0.369	4600	160
		2,000,000	18,000	1.760	0.716	0.342	0.241	0.039	0.391	4710	155	230 kV	925	750,000	15,360	1.286	0.550	0.374	0.238	0.089	0.369	7610	160
														1,000,000	16,790	1.416	0.612	0.360	0.233	0.067	0.355	7140	160
														2,000,000	22,990	1.835	0.763	0.334	0.219	0.038	0.315	5960	170

Source: Westinghouse Electric Corporation, Electrical Transmission and Distribution Reference Book, East Pittsburgh, PA, 1964.

a AC resistance based on 100% conductivity at 65°C including 2% allowance for stranding.

b Dielectric constant = 3.5.

c Calculated for circular tube.

Table A.22

Current-Carrying Capacity of Three-Conductor Belted Paper-Insulated Cables

Conductor Size AWG or MCM	Conductor Typea
		Number of Equally Loaded Cables in Duct Bank								Number of Equally Loaded Cables in Duct Bank
		One				Three				Six Percent Load Factor				Nine				Twelve
		30	50	75	100	30	50	75	100	30	50	75	100	30	50	75	100	30	50	75	100
		Amperes per Conductorb								Amperes per Conductora
	4,500 V	Copper Temperature 85°C
6	S	82	80	78	75	81	78	73	68	79	74	68	63	78	72	65	58	76	69	61	54
4	SR	109	106	103	98	108	102	96	89	104	97	89	81	102	94	84	74	100	90	79	69
2	SR	143	139	134	128	139	133	124	115	136	127	115	104	133	121	108	95	130	117	101	89
1	SR	164	161	153	146	159	152	141	130	156	145	130	118	152	138	122	108	148	133	115	100
0	CS	189	184	177	168	184	175	162	149	180	166	149	134	175	159	140	122	170	152	130	114
00	CS	218	211	203	192	211	201	185	170	208	190	170	152	201	181	158	138	195	173	148	126
000	CS	250	242	232	219	242	229	211	193	237	217	193	172	229	206	179	156	223	197	167	145
0000	CS	286	276	264	249	276	260	240	218	270	246	218	194	261	234	202	176	254	223	189	163
250	CS	316	305	291	273	305	288	263	239	297	271	239	212	288	258	221	192	279	244	206	177
300	CS	354	340	324	304	340	321	292	264	332	301	264	234	321	285	245	211	310	271	227	195
350	CS	392	376	357	334	375	353	320	288	366	330	288	255	351	311	266	229	341	296	248	211
400	CS	424	406	385	359	406	380	344	309	395	355	309	272	380	334	285	244	367	317	264	224
500	CS	487	465	439	408	465	433	390	348	451	403	348	305	433	378	320	273	417	357	296	251
600	CS	544	517	487	450	517	480	430	383	501	444	383	334	480	416	350	298	462	393	323	273
750	CS	618	581	550	505	585	541	482	427	566	500	427	371	541	466	390	331	519	439	359	302
		(1.07 at 10°C,				(1.07 at 10°C,				(1.07 at 10°C,				(1.07 at 10°C,				(1.07 at 10°C,
		0.92 at 30°C,				0.92 at 30°C,				0.92 at 30°C,				0.92 at 30°C,				0.92 at 30°C,
		0.83 at 40°C,				0.83 at 40°C,				0.83 at 40°C,				0.83 at 40°C,				0.83 at 40°C,
		0.73 at 50°C)c				0.73 at 50°C)c				0.73 at 50°C)c				0.73 at 50°C)c				0.73 at 50°C)c
	7,500 V	Copper Temperature 85°C
6	S	81	80	77	74	79	76	72	67	78	74	67	62	77	71	64	57	75	69	60	53
4	SR	107	105	101	97	104	100	94	87	103	96	87	79	100	92	82	73	98	89	77	68
2	SR	140	137	132	126	136	131	122	113	134	125	113	102	130	119	105	93	127	114	99	87
1	SR	161	156	150	143	156	149	138	128	153	142	128	115	149	136	120	105	145	130	112	98
0	CS	186	180	174	165	180	172	156	146	177	163	148	131	172	155	136	120	167	149	128	111
00	CS	214	206	198	188	206	196	181	166	202	186	166	148	196	177	155	135	191	169	145	125
000	CS	243	236	226	214	236	224	206	188	230	211	188	168	223	200	174	152	217	192	163	141
0000	CS	280	270	258	243	270	255	235	214	264	241	213	190	255	229	198	172	247	218	184	159
250	CS	311	300	287	269	300	283	259	235	293	266	235	208	282	252	217	188	273	240	202	174
300	CS	349	336	320	300	335	316	288	260	326	296	259	230	315	279	240	207	304	265	223	190
350	CS	385	369	351	328	369	346	315	283	359	323	282	249	345	305	261	224	333	289	242	206
400	CS	417	399	378	353	398	373	338	303	388	348	303	267	371	317	279	239	360	309	257	220
500	CS	476	454	429	399	454	423	381	341	440	392	340	298	422	369	312	267	406	348	288	245
600	CS	534	508	479	443	507	471	422	376	491	436	375	327	469	408	343	291	451	384	315	267
750	CS	607	576	540	497	575	532	473	413	555	489	418	363	529	455	381	323	507	428	350	295
		(1.08 at 10°C,				(1.08 at 10°C,				(1.08 at 10°C,				(1.08 at 10°C,				(1.08 at 10°C,
		0.92 at 30°C,				0.92 at 30°C,				0.92 at 30°C,				0.92 at 30°C,				0.92 at 30°C,
		0.83 at 40°C,				0.83 at 40°C,				0.83 at 40°C,				0.83 at 40°C,				0.83 at 40°C,
		0.72 at 50°C)c				0.72 at 50°C)c				0.72 at 50°C)c				0.72 at 50°C)c				0.72 at 50°C)c
	15,000 V	Copper Temperature 75°C
6	S	78	77	74	71	76	74	69	64	75	70	64	59	73	68	61	54	72	65	57	50
4	SR	102	99	96	92	98	95	89	83	97	91	83	75	95	87	78	69	93	85	73	64
2	SR	132	129	125	119	129	123	115	106	126	117	106	96	123	112	99	88	120	108	93	82
1	SR	151	147	142	135	146	140	131	120	144	133	120	109	140	128	112	99	136	122	107	92
0	CS	175	170	163	155	169	161	150	138	166	153	137	123	161	146	128	112	156	139	120	104
00	CS	200	194	187	177	194	184	170	156	189	175	156	139	183	166	145	127	178	158	135	117
000	CS	230	223	214	202	222	211	195	178	217	199	177	158	210	189	165	143	203	180	153	132
0000	CS	266	257	245	232	253	242	222	202	249	228	201	179	240	215	187	158	233	205	173	149
250	CS	295	284	271	255	281	268	245	221	276	251	220	196	266	239	204	177	257	225	189	163
300	CS	330	317	301	283	316	297	271	245	307	278	244	215	295	264	225	194	285	248	208	178
	15,000 V	Copper Temperature 75°C
350	CS	365	349	332	310	348	327	297	267	339	305	266	235	324	289	245	211	313	271	227	193
400	CS	394	377	357	333	375	352	319	286	365	327	285	251	349	307	262	224	336	290	241	206
500	CS	449	429	406	377	428	399	359	321	414	396	319	280	396	346	293	250	379	326	269	229
600	CS	502	479	450	417	476	443	396	352	459	409	351	306	438	380	319	273	420	358	294	249
750	CS	572	543	510	468	540	499	444	393	520	458	391	341	494	425	356	302	471	399	326	275
		(1.09 at 10°C,				(1.09 at 10°C,				(1.09 at 10°C,			(1.09 at 10°C,				(1.09 at 10°C,
		0.90 at 30°C,				0.90 at 30°C,				0.90 at 30°C,			0.90 at 30°C,				0.90 at 30°C,
		0.79 at 40°C,				0.79 at 40°C,				0.79 at 40°C,			0.79 at 40°C,				0.79 at 40°C,
		0.67 at 50°C)c				0.67 at 50°C)c				0.66 at 50°C)c			0.66 at 50°C)c				0.66 at 50°C)c

Source: Westinghouse Electric Corporation, Electrical Transmission and Distribution Reference Book, East Pittsburgh, PA, 1964.

a The following symbols are used here to designate conductor types: S, solid copper; SR, standard round concentric-stranded; CS, compact-sector stranded.

b Current ratings are based on the following conditions:

1. Ambient earth temperature = 20°C.

2. 60-cycle alternating current.

3. Ratings include dielectric loss, and all induced AC losses.

4. One cable per duct, all cables equally loaded and in outside ducts only.

c Multiply tabulated currents by these factors when earth temperature is other than 20°C.

Table of Contents for Table A.18

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Table of Contents for
Table A.18