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Table A.23

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

Conductor Size AWG or MCM	Conductor Typea
		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 Conductorb
	15,000 V	Copper Temperature 81°C				Copper Temperature 81°C
6	S	94	91	88	83	91	87	81	75	89	83	74	66	87	78	69	60	84	75	64	56
4	SR	123	120	115	107	119	114	104	95	116	108	95	85	113	102	89	77	109	96	83	75
2	SR	159	154	146	137	153	144	139	121	149	136	120	107	144	129	112	97	139	123	104	90
1	SR	179	174	166	156	172	163	149	136	168	153	136	121	162	145	125	109	158	138	117	100
0	CS	203	195	182	176	196	185	169	154	190	173	154	137	183	164	141	122	178	156	131	112
00	CS	234	224	215	202	225	212	193	175	218	198	174	156	211	187	162	139	203	177	148	127
000	CS	270	258	245	230	258	242	220	198	249	225	198	174	241	212	182	157	232	202	168	144
0000	CS	308	295	281	261	295	276	250	223	285	257	224	196	275	241	205	176	265	227	189	162
250	CS	341	327	310	290	325	305	276	246	315	283	245	215	303	265	224	193	291	250	207	177
300	CS	383	365	344	320	364	339	305	272	351	313	271	236	337	293	246	211	322	276	227	194
350	CS	417	397	375	346	397	369	330	293	383	340	293	255	366	318	267	227	350	301	245	208
400	CS	453	428	403	373	429	396	354	314	413	366	313	273	394	340	285	242	376	320	262	222
500	CS	513	487	450	418	483	446	399	350	467	410	350	303	444	381	318	269	419	358	292	247
600	CS	567	537	501	460	534	491	437	385	513	450	384	330	488	416	346	293	465	390	317	269
750	CS	643	606	562	514	602	551	485	426	576	502	423	365	545	464	383	323	519	432	348	293
		(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,
		0.91 at 30°C,				0.91 at 30°C,				0.91 at 30°C,				0.91 at 30°C,				0.91 at 30°C,
		0.82 at 40°C,				0.82 at 40°C,				0.82 at 40°C,				0.82 at 40°C,				0.82 at 40°C,
		0.71 at 50°C)b				0.71 at 50°C)b				0.71 at 50°C)b				0.71 at 50°C)b				0.71 at 50°C)b
	23,000 V	Copper Temperature 77°C				Copper Temperature 77°C
2	SR	156	150	143	134	149	141	130	117	145	132	117	105	140	125	107	84	134	119	100	86
1	SR	177	170	162	152	170	160	145	133	164	149	132	117	159	140	121	105	154	133	112	97
0	CS	200	192	183	172	192	182	166	149	186	169	147	132	178	158	136	118	173	149	126	109
00	CS	227	220	210	197	221	208	189	170	212	193	168	149	202	181	156	134	196	172	144	123
000	CS	262	251	238	223	254	238	216	193	242	220	191	169	230	206	175	150	222	195	162	139
0000	CS	301	289	271	251	291	273	246	219	278	250	215	190	264	233	197	169	255	221	182	157
250	CS	334	315	298	277	321	299	270	239	308	275	236	207	290	258	216	184	279	242	199	170
300	CS	373	349	328	306	354	329	297	263	341	302	259	227	320	283	232	202	309	266	217	186
350	CS	405	379	358	331	384	356	318	283	369	327	280	243	347	305	255	217	335	285	233	199
400	CS	434	409	386	356	412	379	340	302	396	348	298	260	374	325	273	232	359	303	247	211
500	CS	492	465	436	401	461	427	379	335	443	391	333	288	424	363	302	257	400	336	275	230
600	CS	543	516	484	440	512	470	414	366	489	428	365	313	464	396	329	279	441	367	299	248
750	CS	616	583	541	495	577	528	465	407	550	479	402	347	520	439	364	306	490	408	329	276
		(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,
		0.80 at 40°C,				0.80 at 40°C,				0.79 at 40°C,				0.79 at 40°C,				0.79 at 40°C,
		0.67 at 50°C)b				0.67 at 50°C)c				0.67 at 50°C)c				0.66 at 50°C)c				0.65 at 50°C)a
	34,000 V	Copper Temperature 70°C				Copper Temperature 70°C
0	CS	193	185	176	165	184	174	158	141	178	161	140	124	171	149	129	111	164	142	119	103
00	CS	219	209	199	187	208	197	178	160	202	182	158	140	194	170	145	126	185	161	134	115
000	CS	250	238	225	211	238	222	202	182	229	206	179	158	220	193	165	141	209	182	152	128
0000	CS	288	275	260	241	273	256	229	205	263	234	203	179	251	219	186	160	238	205	170	144
250	CS	316	302	285	266	301	280	253	224	289	258	222	196	276	240	202	174	262	222	187	157
300	CS	352	335	315	293	334	310	278	246	320	284	244	213	304	264	221	190	288	244	203	171
350	CS	384	364	342	318	363	336	301	267	346	308	264	229	329	285	238	204	311	263	217	184
400	CS	413	392	367	341	384	360	321	284	372	329	281	244	352	303	254	216	334	282	232	195
500	CS	468	442	414	381	436	402	358	317	418	367	312	271	393	337	281	238	372	313	256	215
600	CS	514	487	455	416	481	440	391	344	459	401	340	294	430	367	304	259	406	340	277	232
750	CS	584	548	510	466	541	496	435	383	515	447	378	324	481	409	337	284	452	377	304	255
		(1.10 at 10°C,				(1.10 at 10°C,				(1.10 at 10°C,				(1.10 at 10°C,				(1.10 at 10°C,
		0.89 at 30°C,				0.89 at 30°C,				0.89 at 30°C,				0.88 at 30°C,				0.88 at 30°C,
		0.76 at 40°C,				0.76 at 40°C,				0.76 at 40°C,				0.75 at 40°C,				0.74 at 40°C,
		0.61 at 50°C)c				0.60 at 50°C)b				0.60 at 50°C)1				0.58 at 50°C)3				0.56 at 50°C)3

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 A.24

Current-Carrying Capacity of Single-Conductor Solid Paper-Insulated Cables

Number of Equally Loaded Cables in Duct Bank
Conductor Size AWG or MCM
	Three				Six Percent Load Factor				Nine				Twelve
	30	50	75	100	30	50	75	100	30	50	75	100	30	50	75	100
	Amperes per Conductora			Amperes per Conductora
	7,500 V	Copper Temperature 85°C				Copper Temperature 85°C
6	116	113	109	103	115	110	103	96	113	107	98	90	111	104	94	85
4	164	149	142	135	152	144	134	125	149	140	128	116	147	136	122	110
2	202	196	186	175	199	189	175	162	196	183	167	151	192	178	159	142
1	234	226	214	201	230	218	201	185	226	210	190	172	222	204	181	162
0	270	262	245	232	266	251	231	212	261	242	219	196	256	234	208	184
00	311	300	283	262	309	290	270	241	303	278	250	224	295	268	236	208
000	356	344	324	300	356	333	303	275	348	319	285	255	340	308	270	236
0000	412	395	371	345	408	380	347	314	398	364	325	290	390	352	307	269
250	456	438	409	379	449	418	379	344	437	400	358	316	427	386	336	294
300	512	491	459	423	499	464	420	380	486	442	394	349	474	428	371	325
350	561	537	500	460	546	507	457	403	532	483	429	379	518	466	403	352
400	607	580	540	496	593	548	493	445	576	522	461	407	560	502	434	378
500	692	660	611	561	679	626	560	504	659	597	524	459	641	571	490	427
600	772	735	679	621	757	696	621	557	733	663	579	506	714	632	542	470
700	846	804	741	677	827	758	674	604	802	721	629	548	779	688	587	508
750	881	837	771	702	860	789	700	627	835	750	651	568	810	714	609	526
800	914	866	797	725	892	817	726	648	865	776	674	588	840	740	630	544
1000	1037	980	898	816	1012	922	815	725	980	874	758	657	950	832	705	606
1250	1176	1108	1012	914	1145	1039	914	809	1104	981	845	730	1068	941	784	673
1500	1300	1224	1110	1000	1268	1146	1000	884	1220	1078	922	794	1178	1032	855	731
1750	1420	1332	1204	1080	1382	1240	1078	949	1342	1166	992	851	1280	1103	919	783
2000	1546	1442	1300	1162	1500	1343	1162	1019	1442	1260	1068	914	1385	1190	986	839
	(1.07 at 10°C,				(1.07 at 10°C, 0.92				(1.07 at 10°C, 0.92				(1.07 at 10°C, 0.92
	0.92 at 30°C, 0.83				at 30°C, 0.83				at 30°C, 0.83				at 40°C, 0.73 at 50°C)
	at 40°C, 0.73 at 50°C)b				at 40°C, 0.73 at 50°C)b				at 40°C, 0.73 at 50°C)b				at 40°C, 0.73 at 50°C)b
	15,000 V	Copper Temperature 81°C				Copper Temperature 81°C
6	113	110	105	100	112	107	100	93	110	104	96	87	108	10L	92	83
4	149	145	138	131	147	140	131	117	144	136	125	114	142	132	119	107
2	195	190	180	170	193	183	170	157	189	177	161	146	186	172	154	137
1	226	218	208	195	222	211	195	179	218	204	185	167	214	197	175	157
0	256	248	234	220	252	239	220	203	247	230	209	188	242	223	198	177
00	297	287	271	254	295	278	253	232	287	265	239	214	283	257	226	202
000	344	330	312	290	341	320	293	267	333	306	274	245	327	296	260	230
0000	399	384	361	335	392	367	335	305	383	352	315	280	374	340	298	263
250	440	423	396	367	432	404	367	334	422	387	345	306	412	372	325	286
300	490	470	439	406	481	449	406	369	470	429	382	338	457	413	359	316
350	539	516	481	444	527	491	443	401	514	468	416	367	501	450	391	342
400	586	561	522	480	572	530	478	432	556	506	447	395	542	485	419	366
500	669	639	592	543	655	605	542	488	636	577	507	445	618	551	474	412
600	746	710	656	601	727	668	598	537	705	637	557	488	685	608	521	452
700	810	772	712	652	790	726	647	581	766	691	604	528	744	659	564	488
750	840	797	736	674	821	753	672	602	795	716	625	547	772	684	584	505
800	869	825	762	696	850	780	695	622	823	741	646	565	800	707	604	522
1000	991	939	864	785	968	882	782	697	933	832	724	631	903	794	675	581
1250	1130	1067	975	864	1102	1000	883	784	1063	941	816	706	1026	898	759	650
1500	1250	1176	1072	966	1220	1105	972	856	1175	1037	892	772	1133	987	828	707
1750	1368	1282	1162	1044	1330	1198	1042	919	1278	1124	958	824	1230	1063	886	755
2000	1464	1368	1233	1106	1422	1274	1105	970	1360	1192	1013	889	1308	1125	935	795
	(1.08 at 10°C, 0.92 at 30°C, 0.82 at 40°C, 0.71 at 50°C)b				(1.08 at 10°C, 0.92 at 30°C, 0.82 at 40°C, 0.71 at 50°C)b				(1.08 at 10°C, 0.92 at 30°C, 0.82 at40°C, 0.71 at50°C)b				(1.08 at 10°C, 0.92 at 30°C, 0.82 at 40°C, 0.71 at 50°C)b
	23,000 V	Copper Temperature 77°C				Copper Temperature 77°C
2	186	181	172	162	184	175	162	150	180	169	154	140	178	164	147	132
1	214	207	197	186	211	200	185	171	206	193	176	159	203	187	167	150
0	247	239	227	213	244	230	213	196	239	222	197	182	234	216	192	171
00	283	273	258	242	278	263	243	221	275	253	225	205	267	245	217	193
000	326	314	296	277	320	302	276	252	315	290	259	233	307	280	247	220
0000	376	362	340	317	367	345	315	288	360	332	297	265	351	320	281	250
250	412	396	373	346	405	380	346	316	396	365	326	290	386	351	307	272
300	463	444	416	386	450	422	382	349	438	404	360	319	428	389	340	301
350	508	488	466	422	493	461	418	380	481	442	393	347	468	424	369	326
400	548	525	491	454	536	498	451	409	521	478	423	373	507	458	398	349
500	627	600	559	514	615	570	514	464	597	546	480	423	580	521	450	392
600	695	663	616	566	684	632	568	511	663	603	529	466	645	577	496	431
700	765	729	675	620	744	689	617	554	725	656	574	503	703	627	538	467
750	797	759	702	643	779	717	641	574	754	681	596	527	732	650	558	483
800	826	786	726	665	808	743	663	595	782	706	617	540	759	674	576	500
1000	946	898	827	752	921	842	747	667	889	797	692	603	860	759	646	580
1250	1080	1020	935	848	1052	957	845	751	1014	904	781	676	980	858	725	630
1500	1192	1122	1025	925	1162	1053	926	818	1118	993	855	736	1081	940	791	682
1750	1296	1215	1106	994	1256	1130	991	875	1206	1067	911	785	1162	1007	843	720
2000	1390	1302	1180	1058	1352	1213	1053	928	1293	1137	967	831	1240	1073	893	760
	(1.09 at 10°C, 0.90 at 30°C, 0.80 at 40°C, 0.68 at 50°C)b				(1.09 at 10°C, 0.90 at 30°C, 0.80 at 40°C, 0.68 at 50°C)b				(1.09 at 10°C, 0.90 at 30°C, 0.80 at 40°C, 0.68 at 50°C)b				(1.09 at 10°C, 0.90 at 30°C, 0.80 at 40°C, 0.62 at 50°C)b
	34,500 V	Copper Temperature 70°C				Copper Temperature 70°C
0	227	221	209	197	225	213	197	182	220	205	187	169	215	199	177	158
00	260	251	239	224	255	242	224	205	249	234	211	190	245	226	200	179
000	299	290	273	256	295	278	256	235	288	268	242	217	282	259	230	204
0000	341	330	312	291	336	317	291	267	328	304	274	246	321	293	259	230
250	380	367	345	322	374	352	321	294	364	337	303	270	356	324	286	253
300	422	408	382	355	416	390	356	324	405	374	334	298	395	359	315	278
350	464	446	419	389	455	426	388	353	443	408	364	324	432	392	343	302
400	502	484	451	419	491	460	417	379	478	440	390	347	466	421	368	323
500	575	551	514	476	562	524	474	429	547	500	442	392	532	479	416	364
600	644	616	573	528	629	584	526	475	610	556	491	433	593	532	459	401
700	710	675	626	577	690	639	574	517	669	608	535	470	649	580	500	435
750	736	702	651	598	718	664	595	535	696	631	554	486	675	602	518	450
800	765	730	676	620	747	690	617	555	723	654	574	503	700	624	535	465
1000	875	832	766	701	852	783	698	624	823	741	646	564	796	706	601	520
1250	994	941	864	786	967	882	782	696	930	833	722	628	898	790	670	577
1500	1098	1036	949	859	1068	972	856	760	1025	914	788	682	988	865	730	626
1750	1192	1123	1023	925	1156	1048	919	814	1109	984	845	730	1066	929	780	668
2000	1275	1197	1088	981	1234	1115	975	860	1182	1045	893	770	1135	985	824	704
2500	1418	1324	1196	1072	1367	1225	1064	936	1305	1144	973	834	1248	1075	893	760
	(1.10 at 10°C, 0.89 at 30°C, 0.76 at 40°C, 0.61 at 50°C)b				(1.10 at 10°C, 0.89 at 30°C, 0.76 at 40°C, 0.61 at 50°C)b				(1.10 at 10°C, 0.89 at 30°C, 0.76 at 40°C, 0.60 at 50°C)b				(1.10 at 10°C, 0.89 at 30°C, 0.76 at 40°C, 0.60 at 50°C)b
	46,000 V	Copper Temperature 65°C				Copper Temperature 65°C
000	279	270	256	240	274	259	230	221	268	249	226	204	262	241	214	191
0000	322	312	294	276	317	299	274	251	309	287	259	232	302	276	244	217
250	352	340	321	300	346	326	299	274	336	313	282	252	329	301	266	236
300	394	380	358	334	385	364	332	304	377	349	313	280	367	335	295	260
350	433	417	392	365	425	398	364	331	413	382	341	304	403	366	321	283
400	469	451	423	393	459	430	391	356	446	411	367	326	433	394	344	307
500	534	512	482	444	522	487	441	400	506	464	412	365	492	444	386	339
	46,000 V	Copper Temperature 65°C				Copper Temperature 65°C
600	602	577	538	496	589	546	494	447	570	520	460	406	553	497	430	377
700	663	633	589	542	645	598	538	488	626	569	502	441	605	542	468	408
750	689	658	611	561	672	622	559	504	650	590	520	457	629	562	485	422
800	717	683	638	583	698	645	578	522	674	612	538	472	652	582	501	436
1000	816	776	718	657	794	731	653	585	766	691	604	528	740	657	562	487
1250	927	879	810	738	900	825	732	654	865	777	675	589	834	736	626	541
1500	1020	968	887	805	992	904	799	703	951	850	735	638	914	802	679	585
1750	1110	1047	959	867	1074	976	859	762	1028	915	788	682	987	862	726	623
2000	1184	1115	1016	918	1144	1035	909	805	1094	970	833	718	1048	913	766	656
2500	1314	1232	1115	1002	1265	1138	994	875	1205	1062	905	778	1151	996	830	708
	(1.11 at 10°C, 0.87 at 30°C, 0.73 at 40°C, 0.54 at 50°C)b				(1.11 at 10°C, 0.87 at 30°C, 0.72 at 40°C, 0.53 at 50°C)b				(1.11 at 10°C, 0.87 at 30°C, 0.72 at 40°C, 0.52 at 50°C)b				(1.11 at 10°C, 0.87 at 30°C, 0.70 at 40°C, 0.51 at50°C)b
	69,000 V	Copper Temperature 60°C				Copper Temperature 60°C
350	395	382	360	336	387	364	333	305	375	348	312	279	365	332	293	259
400	428	413	389	362	418	393	358	328	405	375	335	300	394	358	315	278
500	489	470	441	409	477	446	406	370	461	425	379	337	447	405	354	312
600	545	524	490	454	532	496	450	409	513	471	419	371	497	448	391	343
700	599	573	536	495	582	543	490	444	561	514	455	403	542	489	425	372
750	623	597	556	514	605	562	508	460	583	533	472	417	563	506	439	384
800	644	617	575	531	626	582	525	475	603	554	487	430	582	523	453	396
1000	736	702	652	599	713	660	592	533	685	622	547	481	660	589	508	442
1250	832	792	734	672	806	742	664	595	772	698	610	535	741	659	564	489
1500	918	872	804	733	886	814	724	647	848	763	664	580	812	718	612	529
1750	994	942	865	788	957	876	776	692	913	818	711	618	873	770	653	563
2000	1066	1008	924	840	1020	931	822	732	972	868	750	651	927	814	688	592
2500	1163	1096	1001	903	1115	1013	892	791	1060	942	811	700	1007	880	741	635
	(1.13 at 10°C, 0.85 at 30°C, 0.67 at 40°C, 0.42 at 50°C)b				(1.13 at 10°C, 0.85 at 30°C, 0.66 at 40°C, 0.42 at 50°C)b				(1.13 at 10°C, 0.84 at 30°C, 0.65 at 40°C, 0.36 at 50°C)b				(1.14 at 10°C, 0.84 at 30°C, 0.64 at 40°C, 0.32 at 50°C)b

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

a Current ratings are based on the following conditions:

1. Ambient earth temperature = 20°C.

2. 60-cycle alternating current.

3. Sheaths bonded and grounded at one point only (open-circuited sheaths).

4. Standard concentric stranded conductors.

5. Ratings include dielectric loss and skin effect.

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

b Multiply tabulated values by these factors when earth temperature is other than 20°C.

Table A.25

60 Hz Characteristics of Self-Supporting Rubber-Insulated Neoprene-Jacketed Aerial Cable

Voltage Class	Conductor Size	Stranding	Insulation Thickness	Shielding	Jacket Thickness	Diameter	Messenger Used with Copper Conductors	Weight per 1000 ft; Messenger and Copper	Messenger Used with Aluminum Conductors	Weight per 1000 ft Messenger and Aluminum
											Positive Sequence 60 ˜ AC Ω/mi				Zero Sequencec 60 ˜ AC Ω/mi
											Resistancea		Reactance		Resistancea		Reactance Series Inductive
											Copper	Aluminum	Series Inductive	Shunt Capacitiveb	Copper	Aluminum	Copper	Aluminum	Shunt Capacitiveb
3 kV ungrounded neutral 5 kV ungrounded neutral	6	7	10/4	No	1/4	0.59	3/4" 30% CCS	1020	3/0"30% CCS	854	2.52	4.13	0.258	—	3.592	5.082	3.712	3.712	—
	4	7	10/4	No	1/4	0.67	3/4"30% CCS	1230	3/0"30% CCS	958	1.58	2.58	0.246	—	2.632	3.572	3.662	3.662
	2	7	10/4	No	1/4	0.73	3/4"30% CCS	1630	3/0"30% CCS	1100	1.00	1.64	0.229	—	2.025	2.605	3.615	3.615	—
	1	19	10/4	No	1/4	0.77	3/4"30% CCS	1780	3/0"30% CCS	1250	0.791	1.29	0.211	—	1.815	2.275	3.582	3.582	—
	1/0	19	10/4	No	1/4	0.81	3/4"30% CCS	2070	3/0"30% CCS	1390	0.635	1.03	0.207	—	1.644	2.015	3.555	3.555	—
	2/0	19	10/4	No	1/4	0.85	3/4"30% CCS	2510	3/0"30% CCS	1530	0.501	0.816	0.200	—	1.622	1.803	3.162	3.526	—
	3/0	19	10/4	No	1/4	0.91	3/4"30% CCS	2890	3/0"30% CCS	1690	0.402	0.644	0.194	—	1.517	1.637	3.135	3.499	—
	4/0	19	10/4	No	1/4	0.99	3/4"30% CCS	3570	3/0"30% CCS	1900	0.318	0.518	0.191	—	1.401	1.508	2.665	3.459	—
	250	37	11/4	No	1/4	1.08	3/2"30% CCS	4080	3/0"30% CCS	2160	0.269	0.437	0.189	—	1.351	1.430	2.635	3.429	—
	300	37	11/4	No	1/4	1.13	3/2"30% CCS	4620	3/0"30% CCS	2500	0.228	0.366	0.184	—	1.308	1.465	2.612	3.042	—
	350	37	11/4	No	1/4	1.18	3/2"30% CCS	5290	3/0"30% CCS	2780	0.197	0.316	0.180	—	1.277	1.415	2.591	3.021	—
	400	37	11/4	No	1/4	1.23	3/2"30% CCS	5800	3/0"30% CCS	3040	0.172	0.276	0.176	—	1.252	1.377	2.576	3.006	—
	500	37	11/4	No	1/4	1.32	3/2"30% CCS	6860	3/0"30% CCS	3650	0.141	0.223	0.172	—	1.219	1.290	2.543	2.543	—
5 kV ungrounded neutral	6	7	11/4	Yes	1/4	0.74	3/2"30% CCS	1310	3/2"30% CCS	1140	2.52	4.13	0.292	4970	—	—	—	—	—
	4	7	11/4	Yes	1/4	0.79	3/2"30% CCS	1540	3/2"30% CCS	1270	1.58	2.58	0.272	4320	—	—	—	—	—
	2	7	11/4	Yes	1/4	0.88	3/2"30% CCS	1950	3/2"30% CCS	1520	1.00	1.64	0.257	3630	—	—	—	—	—
	1	19	11/4	Yes	1/4	0.92	3/2"30% CCS	2180	3/2"30% CCS	1640	0.791	1.29	0.241	3330	—	—	—	—	—
	1/0	19	11/4	Yes	1/4	0.96	3/2"30% CCS	2450	3/2"30% CCS	1770	0.655	1.03	0.233	3080	—	—	—	—	—
	2/0	19	11/4	Yes	1/4	1.00	3/2"30% CCS	2910	3/2"30% CCS	1930	0.501	0.816	0.223	2830	—	—	—	—	—
	3/0	19	11/4	Yes	1/4	1.06	3/2"30% CCS	3320	3/2"30% CCS	2120	0.402	0.644	0.215	2580	—	—	—	—	—
	4/0	19	11/4	Yes	1/4	1.11	3/2"30% CCS	4030	3/2"30% CCS	2350	0.318	0.518	0.207	2380	—	—	—	—	—
	250	37	11/4	Yes	1/4	1.20	3/2"30% CCS	4570	3/2"30% CCS	2770	0.269	0.437	0.206	2380	—	—	—	—	—
	300	37	11/4	Yes	1/4	1.29	3/2"30% CCS	5260	3/2"30% CCS	3140	0.228	0.366	0.203	2280	—	—	—	—	—
	350	37	11/4	Yes	1/4	1.34	3/2"30% CCS	5840	3/2"30% CCS	3380	0.197	0.316	0.199	2090	—	—	—	—	—
	400	37	11/4	Yes	1/4	1.39	3/2"30% CCS	6380	3/2"30% CCS	3610	0.172	0.276	0.194	1890	—	—	—	—	—
	500	37	11/4	Yes	1/4	1.47	3/2"30% CCS	7470	3/2"30% CCS	4240	0.141	0.223	0.187	1740	—	—	—	—	—
15 kV grounded neutral	6	19	11/4	Yes	1/4	1.05	3/2"30% CCS	2090	3/2"30% CCS	1920	2.52	4.13	0.326	7150	3.846	5.346	3.396	3.396	7150
	4	19	11/4	Yes	1/4	1.10	3/2"30% CCS	2350	3/2"30% CCS	2080	1.58	2.58	0.302	6260	2.901	3.831	3.364	3.364	6260
	2	19	11/4	Yes	1/4	1.16	3/2"30% CCS	2860	3/2"30% CCS	2430	1.00	1.64	0.279	5460	2.459	3.039	2.851	2.851	5460
	1	19	11/4	Yes	1/4	1.20	3/2"30% CCS	3120	3/2"30% CCS	2580	0.791	1.29	0.268	5110	2.238	2.701	2.837	2.837	5110
	1/0	19	11/4	Yes	1/4	1.27	3/2"30% CCS	3560	3/2"30% CCS	2880	0.655	1.03	0.260	4720	2.052	2.426	2.825	2.825	4720
	2/0	19	11/4	Yes	1/4	1.32	3/2"30% CCS	4120	3/2"30% CCS	3070	0.501	0.816	0.249	4370	1.896	2.214	2.251	2.801	4370
	3/0	19	11/4	Yes	1/4	1.37	3/2"30% CCS	4580	3/2"30% CCS	3510	0.402	0.644	0.241	4120	1.782	2.008	2.240	2.240	4120
	4/0	19	11/4	Yes	1/4	1.43	3/2"30% CCS	5150	3/2"30% CCS	3790	0.318	0.518	0.231	3770	1.681	1.864	2.235	2.235	3770
	250	37	11/4	Yes	1/4	1.47	3/2"30% CCS	5590	3/2"30% CCS	3980	0.269	0.437	0.223	3570	1.630	1.782	2.227	2.227	3570
	300	37	11/4	Yes	1/4	1.53	3/2"30% CCS	6260	3/2"30% CCS	4330	0.228	0.366	0.217	3330	1.577	1.701	2.226	2.226	3330
	350	37	11/4	Yes	1/4	1.59	3/2"30% CCS	6870	3/2"30% CCS	4600	0.197	0.316	0.212	3130	1.536	1.640	2.226	2.226	3130
	400	37	11/4	Yes	1/4	1.63	3/2"30% CCS	7450	3/2"30% CCS	4860	0.172	0.276	0.208	2980	1.500	1.592	2.216	2.216	2980
	500	37	11/4	Yes	1/4	1.75	3/2"30% CCS	8970	3/2"30% CCS	5560	0.141	0.223	0.204	2830	1.454	1.524	2.198	2.198	2830

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

a AC resistance based on 65°C with allowance for stranding, skin effect, and proximity effect.

b Dielectric constant assumed to be 6.0.

c Zero sequence impedance based on return current both in the messenger and in 100 mΩ earth.

References

1. Westinghouse Electric Corporation: Electrical Transmission and Distribution Reference Book, East Pitsburgh, PA, 1964.

2. Westinghouse Electric Corporation: Electric Utility Engineering Reference Book—Distribution Systems. Vol. 3, East Pitsburgh, PA, 1965.

3. Edison Electric Institute: Transmission Line Reference Book, New York, 1968.

4. Anderson, P. M.: Analysis of Faulted Power Systems, Iowa State University Press, Ames, IA, 1973.

5. Westinghouse Electric Corporation: Applied Protective Relaying, Newark, NJ, 1970.

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