SWA Armour

[davel81]

Hi

Ive got to run in some SWA cables for some large bits of equipment. Its TP&N, is there any issues with using 4 core and using the armour for the earth (ensuring the Zs is ok)?

 

[trev]

There's a thread on here about this very subject and someone posted a table showing what was acceptable and what was not, so if you find it you'll know long before you do your Zs test.

 

[telectrix]

as long as the armour is of sufficient csa. generally all SWA up to 90mm complies. some of the xlpe SWA doesn't.

 

[Brightspark2]

As long as the armour meets the requirements then theres no problem at all...

http://www.earthingnuts.co.uk/#

Have a look through table 5 under technical info...

 

[bugsy]

Lenny posted a sticky on this very subject

 

[sjhall]

Unless cost is massively different I'd always use 5 core.... here's a link for you to look at

http://www.gadsolutions.biz/component/k2/item/3-swa-as-cpc

 

[Guest55]

Hi

Ive got to run in some SWA cables for some large bits of equipment. Its TP&N, is there any issues with using 4 core and using the armour for the earth (ensuring the Zs is ok)?

more to the point , how "large" is large ? , in current rating.

 

[davel81]

more to the point , how "large" is large ? , in current rating.

about 30kw

 

[Brightspark2]

Lenny posted a sticky on this very subject

Is it still there?...had disappeared last time I looked...

 

[Deleted member 26818]

Don't bother with that earthing nuts chart.
Do a search for 'john peckham' and use his chart.

 

[Guest55]

about 30kw

which is round about 43A per phase per machine without power factor or diversity.
so youre only going to use 10-16mm depending on length so xlpe will be fine for swa earthing

 

[Engineer54]

As long as the armour meets the requirements then theres no problem at all...

Earthing Nuts - Speed up metal cable gland installation and EMI / RFI screening

Have a look through table 5 under technical info...

THROW THAT DAMMED TABLE AWAY!! It causes more confusion, than any help!!

Use this table where all the calculations have been done for you...


Blue = min CSA of cables SWA to comply.

(Red) = Cable does not comply.

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

[TABLE="class: yiv1559363916MsoTableGrid"]
[TR]
[TD]

Conductor CSA​

[/TD]
[TD]

Minimum CSA of SWA to meet 54G​

[/TD]
[TD="width: 118"]

CSA of armour 2 core​

[/TD]
[TD="width: 118"]

CSA of armour 3 core​

[/TD]
[TD="width: 118"]

CSA of armour 4 core​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

1.5​

[/TD]
[TD="width: 118"]

3.4​

[/TD]
[TD="width: 118"]

15​

[/TD]
[TD="width: 118"]

16​

[/TD]
[TD="width: 118"]

17​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

2.5​

[/TD]
[TD="width: 118"]

5.7​

[/TD]
[TD="width: 118"]

17​

[/TD]
[TD="width: 118"]

19​

[/TD]
[TD="width: 118"]

20​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

4​

[/TD]
[TD="width: 118"]

9.0​

[/TD]
[TD="width: 118"]

21​

[/TD]
[TD="width: 118"]

23​

[/TD]
[TD="width: 118"]

35​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

6​

[/TD]
[TD="width: 118"]

13.6​

[/TD]
[TD="width: 118"]

24​

[/TD]
[TD="width: 118"]

36​

[/TD]
[TD="width: 118"]

40​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

10​

[/TD]
[TD="width: 118"]

22.6​

[/TD]
[TD="width: 118"]

41​

[/TD]
[TD="width: 118"]

44​

[/TD]
[TD="width: 118"]

49​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

16​

[/TD]
[TD="width: 118"]

36.1​

[/TD]
[TD="width: 118"]

46​

[/TD]
[TD="width: 118"]

50​

[/TD]
[TD="width: 118"]

72​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

25​

[/TD]
[TD="width: 118"]

36.1​

[/TD]
[TD="width: 118"]

60​

[/TD]
[TD="width: 118"]

66​

[/TD]
[TD="width: 118"]

76​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

35​

[/TD]
[TD="width: 118"]

36.1​

[/TD]
[TD="width: 118"]

66​

[/TD]
[TD="width: 118"]

74​

[/TD]
[TD="width: 118"]

84​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

50​

[/TD]
[TD="width: 118"]

56.4​

[/TD]
[TD="width: 118"]

74​

[/TD]
[TD="width: 118"]

84​

[/TD]
[TD="width: 118"]

122​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

70​

[/TD]
[TD="width: 118"]

79.0​

[/TD]
[TD="width: 118"]

84​

[/TD]
[TD="width: 118"]

119​

[/TD]
[TD="width: 118"]

138​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

95​

[/TD]
[TD="width: 118"]

107.2​

[/TD]
[TD="width: 118"]

122​

[/TD]
[TD="width: 118"]

138​

[/TD]
[TD="width: 118"]

160​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

120​

[/TD]
[TD="width: 118"]

135.3​

[/TD]
[TD="width: 118"]

(131) ​

[/TD]
[TD="width: 118"]

150​

[/TD]
[TD="width: 118"]

220​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

150​

[/TD]
[TD="width: 118"]

169.2​

[/TD]
[TD="width: 118"]

(144) ​

[/TD]
[TD="width: 118"]

211​

[/TD]
[TD="width: 118"]

240​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

185​

[/TD]
[TD="width: 118"]

208.6​

[/TD]
[TD="width: 118"]

(201) ​

[/TD]
[TD="width: 118"]

230​

[/TD]
[TD="width: 118"]

265​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

240​

[/TD]
[TD="width: 118"]

270.6​

[/TD]
[TD="width: 118"]

(225) ​

[/TD]
[TD="width: 118"]

(260)​

[/TD]
[TD="width: 118"]

299​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

300​

[/TD]
[TD="width: 118"]

338.3​

[/TD]
[TD="width: 118"]

(250) ​

[/TD]
[TD="width: 118"]

(289)​

[/TD]
[TD="width: 118"]

(333)​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

400​

[/TD]
[TD="width: 118"]

403.9​

[/TD]
[TD="width: 118"]

(279) ​

[/TD]
[TD="width: 118"]

(319)​

[/TD]
[TD="width: 118"]

467​

[/TD]
[/TR]
[/TABLE]


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

[TABLE="class: yiv1559363916MsoTableGrid"]
[TR]
[TD]

Conductor CSA​

[/TD]
[TD]

Minimum CSA of SWA to meet 54G​

[/TD]
[TD="width: 118"]

CSA of armour 2 core​

[/TD]
[TD="width: 118"]

CSA of armour 3 core​

[/TD]
[TD="width: 118"]

CSA of armour 4 core​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

1.5​

[/TD]
[TD="width: 118"]

3.4​

[/TD]
[TD="width: 118"]

16​

[/TD]
[TD="width: 118"]

17​

[/TD]
[TD="width: 118"]

18​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

2.5​

[/TD]
[TD="width: 118"]

5.7​

[/TD]
[TD="width: 118"]

17​

[/TD]
[TD="width: 118"]

19​

[/TD]
[TD="width: 118"]

20​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

4​

[/TD]
[TD="width: 118"]

9.0​

[/TD]
[TD="width: 118"]

19​

[/TD]
[TD="width: 118"]

21​

[/TD]
[TD="width: 118"]

23​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

6​

[/TD]
[TD="width: 118"]

13.6​

[/TD]
[TD="width: 118"]

22​

[/TD]
[TD="width: 118"]

23​

[/TD]
[TD="width: 118"]

36​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

10​

[/TD]
[TD="width: 118"]

22.6​

[/TD]
[TD="width: 118"]

26​

[/TD]
[TD="width: 118"]

39​

[/TD]
[TD="width: 118"]

43​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

16​

[/TD]
[TD="width: 118"]

36.1​

[/TD]
[TD="width: 118"]

41​

[/TD]
[TD="width: 118"]

44​

[/TD]
[TD="width: 118"]

49​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

25​

[/TD]
[TD="width: 118"]

36.1​

[/TD]
[TD="width: 118"]

42​

[/TD]
[TD="width: 118"]

62​

[/TD]
[TD="width: 118"]

70​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

35​

[/TD]
[TD="width: 118"]

36.1​

[/TD]
[TD="width: 118"]

62​

[/TD]
[TD="width: 118"]

70​

[/TD]
[TD="width: 118"]

80​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

50​

[/TD]
[TD="width: 118"]

56.4​

[/TD]
[TD="width: 118"]

68​

[/TD]
[TD="width: 118"]

78​

[/TD]
[TD="width: 118"]

90​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

70​

[/TD]
[TD="width: 118"]

79.0​

[/TD]
[TD="width: 118"]

80​

[/TD]
[TD="width: 118"]

90​

[/TD]
[TD="width: 118"]

131​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

95​

[/TD]
[TD="width: 118"]

107.2​

[/TD]
[TD="width: 118"]

113​

[/TD]
[TD="width: 118"]

128​

[/TD]
[TD="width: 118"]

147​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

120​

[/TD]
[TD="width: 118"]

135.3​

[/TD]
[TD="width: 118"]

(125) ​

[/TD]
[TD="width: 118"]

141​

[/TD]
[TD="width: 118"]

206​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

150​

[/TD]
[TD="width: 118"]

169.2​

[/TD]
[TD="width: 118"]

(138)​

[/TD]
[TD="width: 118"]

201​

[/TD]
[TD="width: 118"]

230​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

185​

[/TD]
[TD="width: 118"]

208.6​

[/TD]
[TD="width: 118"]

(191) ​

[/TD]
[TD="width: 118"]

220​

[/TD]
[TD="width: 118"]

255​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

240​

[/TD]
[TD="width: 118"]

270.6​

[/TD]
[TD="width: 118"]

(215) ​

[/TD]
[TD="width: 118"]

(250)​

[/TD]
[TD="width: 118"]

289​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

300​

[/TD]
[TD="width: 118"]

338.3​

[/TD]
[TD="width: 118"]

(235) ​

[/TD]
[TD="width: 118"]

(269)​

[/TD]
[TD="width: 118"]

(319)​

[/TD]
[/TR]
[TR]
[TD="width: 118"]

400​

[/TD]
[TD="width: 118"]

451.0​

[/TD]
[TD="width: 118"]

(265) ​

[/TD]
[TD="width: 118"]

(304)​

[/TD]
[TD="width: 118"]

452​

[/TD]
[/TR]
[/TABLE]


Remember these tables refer to complying with CPC requirements, They do NOT refer to Bonding CSA requirements...

 

[trev]

That's the table I was thinking of

 

[GLENNSPARK]

Is it still there?...had disappeared last time I looked...

yes well it would`v done wouldn`t it....
come on...think about it...