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

Power Cable-Technical Details

Multicore armoured XLPE insulated cables current rating

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

Conductor operating temperature: 90^oC

APPENDIX 6

Table 6(a)

Conductor Cross-Sectional Area	Open and clipped direct:		On a perforated cable tray horizontal or Vertical
Conductor Cross-Sectional Area
	1 two-core cable single-phase a.c. or d.c	1 three or four-core cable, three-phase a.c.	1 two-core cable single-phase a.c. or d.c	1 threeor four-core cable tray, or reference Method 13(fee air)	Short circuit current for 1 second

mm²	A	A	A	A	kA
1.5	27	23	29	25	0.21
2.5	36	31	39	33	0.35
4	49	42	52	44	0.57
6	62	53	66	56	0.85
10	85	73	90	78	1.43
16	110	94	115	99	2.28
25	146	124	152	131	3.57
35	180	154	188	162	5.00
50	219	187	228	197	7.15
70	279	238	291	251	10.01
95	338	289	354	304	13.58
120	392	335	410	353	17.16
150	451	386	472	406	21.45
185	515	441	539	463	26.45
240	607	520	636	546	34.32
300	698	599	732	628	42.90
400	787	673	847	728	57.20

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

Table 6(b)

Conductor Cross-Sectional Area	Two-core cable d.c.	Two core cable single phase a.c.			Three or four-core cable three-phase a.c.
mm²	mV/A/m	mV/A/m			mV/A/m
1.5	31	31			27
2.5	19	19			16
4	12	12			10
6	7.9	7.9			6.8
10	4.7	4.7			4.0
16	2.9	2.9			2.5
		r	x	z	r	x	Z
25	1.85	1.85	0.160	1.90	1.60	0.140	1.65
35	1.35	1.35	0.155	1.35	1.15	0.135	1.15
50	0.98	0.99	0.155	1.00	0.86	0.135	0.87
70	0.67	0.67	0.150	0.69	0.59	0.130	0.60
95	0.49	0.50	0.150	0.52	0.43	0.130	0.45
120	0.39	0.40	0.145	0.42	0.34	0.130	0.37
150	0.31	0.32	0.145	0.35	0.28	0.125	0.30
185	0.25	0.26	0.145	0.29	0.22	0.125	0.26
240	0.195	0.20	0.140	0.24	0.175	0.125	0.21
300	0.155	0.16	0.140	0.21	0.140	0.120	0.185
400	0.120	0.13	0.140	0.190	0.115	0.120	0.165

Note: The above current carrying capacities are for reference only, the current carrying capacities may be varied for different installation conditions

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	-	-

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