Technical Resources

We have gathered together a number of technical resources for use as reference on electrical projects.

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Cable: PVC Flexes

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PVC Flexes: BS 6141 & BS 6500

Table 4F3A - flexible cords, non-armoured (copper conductors)

Current Carrying Capacity

Current-carrying capacity Conductor cross-sectional Single-phase A.C. area	Current-carrying capacity		Maximum mass supportable by Three-phase A.C. twin flexible cord (see Regulations 522.7.2 and 559.6.1.5)
	D.C. or single-phase A.C	Three-phase A.C.
mm2	A	A	kg
0.5	3	3	2
0.75	6	6	3
1	10	10	5
1.25	13	-	5
1.5	16	16	5
2.5	25	20	5
4	32	25	5

RATING FACTOR FOR AMBIENT TEMPERATURE

60ºC thermoplastic or thermosetting insulated cords:

Ambient temperature	35ºC	40ºC	45ºC	50ºC	55ºC
Rating Factor	0.91	0.82	0.71	0.58	0.41

90ºC thermoplastic or thermosetting insulated cords:

Ambient temperature	35ºC to 50ºC	55ºC	60ºC	65ºC	70ºC
Rating Factor	1	0.96	0.83	0.67	0.47

Glass fibre cords:

Ambient temperature	35ºC to 150ºC	155ºC	160ºC	165ºC	170ºC	175ºC
Rating Factor	1	0.92	0.82	0.71	0.57	0.4

180ºC thermoplastic or thermosetting insulated cords:

Ambient temperature	35ºC to 120ºC	125ºC	130ºC	135ºC	140ºC	145ºC
Rating Factor	1	0.96	0.85	0.74	0.6	0.42

VOLTAGE DROP

Table 4F3B Conductor operating temperature: 60ºC

Conductor cross-sectional area	D.C. or single-phase A.C	Three-phase A.C.
mm2	A	mV/A/m
0.5	93	80
0.75	62	54
1	46	40
1.25	37	-
1.5	32	27
2.5	19	16
4	12	10

NOTE: *The tabulated values above are for 60ºc thermoplastic or thermosetting insulated flexible cords and for other types of flexible cords they are to be multiplied by the following factors: