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

Power Cable-Technical Details

Single core PVC insulated cables current rating

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

Conductor operating temperature: 70^oC

APPENDIX 2

Table 2(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	11	10.5	13.5	12	15.5	14	-	-	-	-	-
1.5	14.5	13.5	17.5	15.5	20	18	-	-	-	-	-
2.5	19.5	18	24	21	27	25	-	-	-	-	-
4	26	24	32	28	37	33	-	-	-	-	-
6	34	31	41	36	47	43	-	-	-	-	-
10	46	42	57	50	65	59	-	-	-	-	-
16	61	56	76	68	87	79	-	-	-	-	-
25	80	73	101	89	114	104	126	112	146	130	110
35	99	89	125	110	141	129	156	141	181	162	137
50	119	108	151	134	182	167	191	172	219	197	167
70	151	136	192	171	234	214	246	223	281	254	216
95	182	164	232	207	284	261	300	273	341	311	264
120	210	188	269	239	330	303	349	318	396	362	308
150	240	216	300	262	381	349	404	369	456	419	356
185	273	245	341	296	436	400	463	424	521	480	409
240	320	286	400	346	515	472	549	504	615	569	485
300	367	328	458	394	594	545	635	584	709	659	561
400	-	-	546	467	694	634	732	679	852	795	656
500	-	-	626	533	792	723	835	778	982	920	749
630	-	-	720	611	904	926	953	892	1138	1070	855
800	-	-	-	-	1030	943	1086	1020	1265	1188	871
1000	-	-	-	-	1154	1058	1216	1149	1420	1337	1079

Note:

Where a conductor operates at a temperature exceeding 70^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 70^oC. the current rating given in the equivalent table for 70^oC PVC insulated cables shall be used.
For details, please refer to BS7671:2001 Tale 4D1A

VOLTAGE DROP (per ampere per metre): Conductor operating temperature: 70^oC

Table 2(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	44	44			44			44			38			38			38			38
1.5	29	29			29			29			25			25			25			25
2.5	18	18			18			18			15			15			15			15
4	11	11			11			11			9.5			9.5			9.5			9.5
6	7.3	7.3			7.3			7.3			6.4			6.4			6.4			6.4
10	4.4	4.4			4.4			4.4			3.8			3.8			3.8			3.8
16	2.8	2.8			2.8			2.8			2.4			2.4			2.4			2.4
		r	x	z	r	x	z	r	x	z	r	X	z	r	x	z	r	x	z	r	x	z
25	1.75	1.80	0.33	1.80	1.75	0.20	1.75	1.75	0.29	1.80	1.50	0.29	1.55	1.50	0.175	1.50	1.50	0.25	1.55	1.50	0.32	1.55
35	1.25	1.30	0.31	1.30	1.25	0.195	1.25	1.25	0.28	1.30	1.10	0.27	1.10	1.10	0.170	1.10	1.10	0.24	1.10	1.10	0.32	1.15
50	0.93	0.95	0.30	1.00	0.93	0.190	0.95	0.93	0.28	0.97	0.81	0.26	0.85	0.80	0.165	0.82	0.80	0.24	0.84	0.80	0.32	0.86
70	0.63	0.65	0.29	0.72	0.63	0.185	0.66	0.63	0.27	0.69	0.56	0.25	0.61	0.55	0.160	0.57	0.55	0.24	0.60	0.55	0.31	0.63
95	0.46	0.49	0.28	0.56	0.47	0.180	0.50	0.47	0.27	0.54	0.42	0.24	0.48	0.41	0.155	0.43	0.41	0.23	0.47	0.40	0.31	0.51
120	0.36	0.39	0.27	0.47	0.37	0.175	0.41	0.37	0.26	0.45	0.33	0.23	0.41	0.32	0.150	0.36	0.32	0.23	0.40	0.32	0.30	0.44
150	0.29	0.31	0.27	0.41	0.30	0.175	0.34	0.29	0.26	0.39	0.27	0.23	0.36	0.26	0.150	0.30	0.26	0.23	0.34	0.26	0.30	0.40
185	0.23	0.25	0.27	0.37	0.24	0.170	0.29	0.24	0.26	0.35	0.22	0.23	0.32	0.21	0.145	0.26	0.21	0.22	0.31	0.21	0.30	0.36
240	0.180	0.195	0.26	0.33	0.185	0.165	0.25	0.185	0.25	0.31	0.17	0.23	0.29	0.160	0.145	0.22	0.160	0.22	0.27	0.160	0.29	0.34
300	0.145	0.160	0.26	0.31	0.150	0.165	0.22	0.150	0.25	0.29	0.14	0.23	0.27	0.130	0.140	0.190	0.130	0.22	0.25	0.130	0.29	0.32
400	0.105	0.130	0.26	0.29	0.120	0.160	0.20	0.115	0.25	0.27	0.12	0.22	0.25	0.105	0.140	0.175	0.105	0.21	0.24	0.100	0.29	0.31
500	0.086	0.110	0.26	0.28	0.098	0.155	0.185	0.093	0.24	0.26	0.10	0.22	0.25	0.086	0.135	0.160	0.086	0.21	0.23	0.081	0.29	0.30
630	0.068	0.094	0.25	0.27	0.081	0.155	0.175	0.076	0.24	0.25	0.08	0.22	0.24	0.072	0.135	0.150	0.072	0.21	0.22	0.066	0.28	0.29
800	0.053	-			0.068	0.150	0.165	0.061	0.24	0.25	-			0.060	0.130	0.145	0.060	0.21	0.22	0.053	0.28	0.29
1000	0.042	-			0.059	0.150	0.160	0.050	0.24	0.24	-			0.052	0.130	0.140	0.052	0.20	0.21	0.044	0.28	0.28

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

2. For details, please refer to BS7671:2001 Tale 4D1B

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		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

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