Three Phase Neutral and Earth

[highspark]

Got to run this in. Is four core and armour as earth acceptable or do I need to run a separate earth??

 

[i=p/u]

Depends on environment being installed and is armour upto being the cpc

 

[i=p/u]

And 5c isn't much more in price normally

 

[yellowvanman]

Got to run this in. Is four core and armour as earth acceptable or do I need to run a separate earth??

Armour is usually good unless its a really big supply.

 

[highspark]

16mm mate

 

[Amp David]

There's a really gone post on this very, 'gone over a million times' before subject.

 

[MDJ]

Yes and a blazing row between members start as well when this subject arises lol

 

[Amp David]

Thats what we like though isn't it.

I hope using the SWA is acceptable in the right conditions, otherwise there a hell of a lot of places that must be dangerous

 

[ashrow]

to kick the argument off, i always run an additional cpc other then the SWA

 

[Amp David]

I don't run a CPC at all

 

[MDJ]

:26: Just need some popcorn now hehe

 

[Amp David]

Sometimes I ask Jim from the pub what he'd off done, but he never knows, as he only does domestic work cash in hand

 

[ashrow]

where art thou my CPC

 

[i=p/u]

I know run a cpc if outside and if inside use armour or use both , remember you only need to bond one end

 

[johnboy6083]

It depends on whether a main bonding conductor is required, and whether the cable sheath is likely to be damaged.
Calculation should be used to check compliance

 

[Engineer54]

to kick the argument off, i always run an additional cpc other then the SWA

WHY??

In this OP's particular instance, the 4 core 16mm SWA armouring will be more than capable of providing this circuits CPC requirements!!

 

[Engineer54]

This is a table giving you an accurate means of identifying when the armouring of SWA cables will and will not comply with BS7671 requirements. As you can see, the required CSA of SWA cables only becomes suspect at cable sizes over 95mm/2core.....

These day's most SWA cables comes with thermosetting insulation (XLPE) as standard. The thermal plastic table, is still handy when assessing or dealing with older cable installations....

Make a copy of this table and you'll never have to ask again, ....If you can use the Steel Wire Armouring as your CPC!! lol!!
PLEASE NOTE.... this table does ''NOT'' relate to equivalent BONDING CSA compliance!!!


Here is an updated table that i have been using for several years now on SWA compliance, for using the armour as your CPC

Figures in brackets, ... DO NOT COMPLY.



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 ​

​

Read more: http://www.electriciansforums.net/e...n-we-use-armour-swa-cpc-11.html#ixzz2BdTJA1PD COPIED from post #155 of this thread

 

[i=p/u]

Well I know the sums to work it out

 

[jumpin jax]

I always run armour in steel trunking and not bond either end:90::grinningelf::biggrinjester::13::59:

 

[T&Earth]

Hi Engineer 54

Thanks for the SWA Tables very useful
Many Thanks
T&E