PVC-Insulated, heat resisting 90C cables for switchgear and controlgear wiring

(COPPER CONDUCTORS) BS7889 BS7211 GB12706.3

CURRENT CARRYING CAPACITY (Amperes):Ambient temperature: 30^oC

Conductor operating temperature: 90^oC

APPENDIX 3

Table 3(a)

Conductor Cross-Sectional Area	Enclosed in conduit in thermally insulating wall etc.		Enclosed in conduit on a wall or in trunking etc.		Cipped direct		On a perforated cable tray horizontal or vertical		Free air






	2 cables, Single-Phase a.c. or d.c.	3 or 4 cables three-phase a.c.	2 cables, Single-Phase a.c. or d.c.	3 or 4 cables three-phase a.c.	2 cables, Single-Phase a.c. or d.c. flat and touching	3 or 4 cables three-phase a.c. flat and touching or trefoil	2 cables, Single-Phase a.c. or d.c. flat and touching	3 or 4 cables three-phase a.c. flat and touching or trefoil	2 cables, Single-Phase a.c. or d.c., or 3 cables three-phase	2 cables, Single-Phase a.c. or d.c., or 3 cables three-phase	3 cables trefoil, three-phase a.c.
1	2	3	4	5	6	7	8	9	10	11	12
mm²	A	A	A	A	A	A	A	A	A	A	A
1	14	13	17	15	19	17.5	-	-	-	-	-
1.5	18	17	22	19	25	23	-	-	-	-	-
2.5	24	23	30	26	34	31	-	-	-	-	-
4	33	30	40	35	46	41	-	-	-	-	-
6	43	39	51	45	59	54	-	-	-	-	-
10	58	53	71	63	81	74	-	-	-	-	-
16	76	70	95	85	109	99	-	-	-	-	-
25	100	91	126	111	143	130	158	140	183	163	138
35	124	111	156	138	176	161	195	176	226	203	171
50	149	135	189	168	228	209	239	215	274	246	209
70	189	170	240	214	293	268	308	279	351	318	270
95	228	205	290	259	355	326	375	341	426	389	330
120	263	235	336	299	413	379	436	398	495	453	385
150	300	270	375	328	476	436	505	461	570	524	445
185	341	306	426	370	545	500	579	530	651	600	511
240	400	358	500	433	644	590	686	630	769	711	606
300	459	410	573	493	743	681	794	730	886	824	701
400	-	-	683	584	868	793	915	849	1065	994	820
500	-	-	783	666	990	904	1044	973	1228	1150	936
630	-	-	900	764	1130	1033	1191	1115	1423	1338	1069
800	-	-	-	-	1288	1179	1358	1275	1581	1485	1214
1000	-	-	-	-	1443	1323	1520	1436	1775	1671	1349

Where a conductor operates at a temperature exceeding 90^oC it shall be ascertained that the equipment connected to the conductor is suitable for the conductor operating temperature.
Where cables in this table are connected to equipment or accessories designed to operate at a temperature not exceeding 90^oC. the current rating given in the equivalent table for 90^oC thermosetting insulated cables (BS 7889, BS 7211) shall be used.
The current carrying capacity in columns 2 to 5 are also applicable to flexible cable to BS 7211 table 3(b) where the cables are used in fixed insulation.
For details, please refer to BS7671:2001 Table 4E1A

VOLTAGE DROP (per ampere per metre):Conductor operating temperature: 90^oC

Table 3(b)

Conductor Cross-Sectional Area	2 cables d.c.	2 cables single phase a.c.									3 or 4 cables three phase a.c.
		Enclosed in conduit etc. in or on a wall			Clipped direct or on trays, touching			Spaced¹			Enclosed in conduit etc. in or on a wall			In trefoil			Flat touching			Flat Spaced*




mm²	mV/A/m	mV/A/m			mV/A/m			mV/A/m			mV/A/m			mV/A/m			mV/A/m			mV/A/m
1	46	46			46			46			40			40			40			40
1.5	31	31			31			31			27			27			27			27
2.5	19	19			19			19			16			16			16			16
4	12	12			12			12			10			10			10			10
6	7.9	7.9			7.9			7.9			6.8			6.8			6.8			6.8
10	4.7	4.7			4.7			4.7			4.0			4.0			4.0			4.0
16	2.9	2.9			2.9			2.9			2.5			2.5			2.5			2.5
		r	x	z	r	x	z	r	X	z	r	X	z	r	x	z	r	x	z	r	x	z
25	1.85	1.85	0.31	1.90	1.85	0.190	1.85	1.85	0.28	1.85	1.60	0.27	1.65	1.60	0.165	1.60	1.60	0.190	1.60	1.60	0.27	1.60
35	1.35	1.35	0.29	1.35	1.35	0.180	1.35	1.35	0.27	1.35	1.15	0.25	1.15	1.15	0.155	1.15	1.15	0.180	1.15	1.15	0.26	1.20
50	0.99	1.00	0.29	1.05	0.99	0.180	1.00	0.99	0.27	1.00	0.87	0.25	0.90	0.86	0.155	0.87	0.86	0.180	0.87	0.86	0.26	0.89
70	0.68	0.70	0.28	0.75	0.68	0.175	0.71	0.68	0.26	0.73	0.60	0.24	0.65	0.59	0.150	0.61	0.59	0.175	0.62	0.59	0.25	0.65
95	0.49	0.51	0.27	0.58	0.49	0.170	0.52	0.49	0.26	0.56	0.44	0.23	0.50	0.43	0.145	0.45	0.43	0.170	0.46	0.43	0.25	0.49
120	0.39	0.41	0.26	0.48	0.39	0.165	0.43	0.39	0.25	0.47	0.35	0.23	0.42	0.34	0.140	0.37	0.34	0.165	0.38	0.34	0.24	0.42
150	0.32	0.33	0.26	0.43	0.32	0.165	0.36	0.32	0.25	0.41	0.29	0.23	0.37	0.28	0.140	0.31	0.28	0.165	0.32	0.28	0.24	0.37
185	0.25	0.27	0.26	0.37	0.26	0.165	0.30	0.25	0.25	0.36	0.23	0.23	0.32	0.22	0.140	0.26	0.22	0.165	0.28	0.22	0.24	0.33
240	0.19	0.21	0.26	0.33	0.20	0.160	0.25	0.195	0.25	0.31	0.185	0.22	0.29	0.170	0.140	0.22	0.170	0.165	0.24	0.170	0.24	0.29
300	0.155	0.175	0.25	0.31	0.160	0.160	0.22	0.155	0.25	0.29	0.150	0.22	0.27	0.140	0.140	0.195	0.135	0.160	0.21	0.135	0.24	0.27
400	0.120	0.140	0.25	0.29	0.130	0.155	0.20	0.125	0.24	0.27	0.125	0.22	0.25	0.110	0.135	0.175	0.110	0.160	0.195	0.110	0.24	0.26
500	0.093	0.120	0.25	0.28	0.105	0.155	0.185	0.098	0.24	0.26	0.100	0.22	0.24	0.090	0.135	0.160	0.088	0.160	0.180	0.085	0.24	0.25
630	0.072	0.100	0.25	0.27	0.086	0.155	0.175	0.078	0.24	0.25	0.088	0.21	0.23	0.074	0.135	0.150	0.071	0.160	0.170	0.068	0.23	0.24
800	0.056	-			0.072	0.150	0.170	0.064	0.24	0.25	-			0.062	0.130	0.145	0.059	0.155	0.165	0.055	0.23	0.24
1000	0.045	-			0.063	0.150	0.165	0.054	0.24	0.24	-			0.055	0.130	0.140	0.050	0.155	0.165	0.047	0.23	0.24

Note: 1. Spacings larger than current dimension, it will result a larger voltage drop.

2.For details, please refer to BS7671:2001 Table 4E1B

Correction Factors for Sizing of Cable Conductors

(1)Correction factors for ambient temperature

APPENDIX 1

Table 1(a)

Type of insulation	Operating temperature
			25	30	35	40	45	50	55	60	65	70	75	80	85	90	95
General purpose PVC		70^oC	1.03	1.0	0.94	0.87	0.79	0.71	0.61	0.50	0.35	-	-	-	-	-	-

Heat resisting PVC		90^oC	1.03	1.0	0.97	0.94	0.91	0.87	0.84	0.80	0.76	0.71	0.61	0.50	0.35	-	-

Thermosetting (XLPE)		90^oC	1.02	1.0	0.96	0.91	0.87	0.82	0.76	0.71	0.65	0.58	0.50	0.41	0.29	-	-

Note: 1.For details, please refer to BS7671:2001 Tale 4C1