R1+r2 values for steel wired armour

[schoe]

Hi all can anyone tell me where the values for r1+r2 for swa are in the regs or onsite guide, can't find them, thanks chris

 

[malcolmsanford]

There are no R1 + R2 values for any cables in the regs, as that is determined by a formula that contains length so you either need to measure or calculate it.

 

[Guest123]

Cable manufacturers websites have the info on resistance of the steel armour when used as a CPC on them.

There is also info here......


Table for 70[SUP]0[/SUP]C Thermoplastic PVC SWA cables.

Conductor CSA	Minimum CSA of SWA to meet 54G	CSA of armour 2 core	CSA of armour 3 core	CSA of armour 4 core
1.5	3.4	15	16	17
2.5	5.7	17	19	20
4	9.0	21	23	35
6	13.6	24	36	40
10	22.6	41	44	49
16	36.1	46	50	72
25	36.1	60	66	76
35	36.1	66	74	84
50	56.4	74	84	122
70	79.0	84	119	138
95	107.2	122	138	160
120	135.3	(131)	150	220
150	169.2	(144)	211	240
185	208.6	(201)	230	265
240	270.6	(225)	(260)	299
300	338.3	(250)	(289)	(333)
400	403.9	(279)	(319)	(467)

Table for 90[SUP]0[/SUP]C Thermosetting SWA cables operating at 70[SUP]0[/SUP]C.

Conductor CSA	Minimum CSA of SWA to meet 54G	CSA of armour 2 core	CSA of armour 3 core	CSA of armour 4 core
1.5	3.4	16	17	18
2.5	5.7	17	19	20
4	9.0	19	21	23
6	13.6	22	23	36
10	22.6	26	39	43
16	36.1	41	44	49
25	36.1	42	62	70
35	36.1	62	70	80
50	56.4	68	78	90
70	79.0	80	90	131
95	107.2	113	128	147
120	135.3	(125)	141	206
150	169.2	(138	201	230
185	208.6	(191)	220	255
240	270.6	(215)	(250)	289
300	338.3	(235)	(269)	(319)
400	451.0	(265)	(304)	(452)

 

[NrVolts]

ive some values to bs 5467 .What conductor size ,how many cores and how long?

 

[ackbarthestar]

You may find this table useful

R1R2 Values

as an aside

You need the following information

1/ Resistivity of the steel wire
2/ Length and csa of steel wire
3/ Ambient temperature correction factors, usually stated at 20 deg C
4/ Running temperature of the cable usually stated at 30 deg C
5/ Operating temperature of cable , usually 90 Deg C or 70 deg C depending on XLPE or PVC, respectively

 

[schoe]

ive some values to bs 5467 .What conductor size ,how many cores and how long?

Thanks very much it wasn't any specific size it was just in general. Thanks though,

Chris