ring v radial

[i=p/u]

thought never mention it but hey its actualy came to light that a ring can be double the length of 4mm radial..

 

[telectrix]

if it goes out and back ( as a ring) then it will be double the length, as long as it takes the same route back. not if it returns via istanbul though.

 

[i=p/u]

gumbet baby here we go

 

[i=p/u]

if im running 4c 25mm swa from service fuse to new dis board(20M) and plan to run single core earth along side, what size do i need .. tn-c-s 0.07 ze....

calculator out in car, i would just run a 16mm but can i get away with 10mm along with armour????

 

[44ALLAN]

Why go to all that bother............use 5 core ?

 

[telectrix]

run 16mm. is it 3 phase?

 

[LlandrilloSpark]

Wired a three story house in four 32A 4mm radials as oppose to 32A rings, I really wished I hadn't, cost more, longer to run and had trouble with max Zs despite no faults found , had to knock it to 20A in the wbd

 

[kingeri]

I've said it before and I'll say it again, 4mm would be much more useful if it had a bigger CPC.

 

[tbs1983]

What size cpc is in 4mm? Is it 2.5mm?

 

[Guest55]

whats wrong with swa as cpc ?

 

[Des 56]

What size cpc is in 4mm? Is it 2.5mm?


Can't answer because the forum thinks the answer is too short

 

[44ALLAN]

Whats wrong with 5th core as cpc in 3p/n swa?

 

[shanky887614]

whats wrong with swa as cpc ?

over a certain size its cheaper to run a single earth than using an extra core in swa (also means in a 90mm swa you wouldnt have to struggle to terminate a 90mm at the other end)

 

[i=p/u]

as for 4mm radials ived devided it up and none will be over 40m using 26A as Ib...

yes 5core swa it is but was thinking maybe cheaper to just run 16mm alongside maybe 10mm

 

[Guest55]

over a certain size its cheaper to run a single earth than using an extra core in swa

for 25mm you dont need to do either.
use the swa for earth.

 

[shanky887614]

for 25mm you dont need to do either.
use the swa for earth.

i know there is a max size but i dont recall exactly.

a mate way saying that you can use screen upto 25mm or so and above that you need a cpc but you can use both screen+cpc so its a smaller core

 

[Sintra]

SWA CPC sizes all in this PDF.

http://www.earthingnuts.co.uk/pdf/pvc_xlpe.pdf

 

[44ALLAN]

3p/N use 5 core.
Dedicated earth and Swa as belt and braces in case some idiot decides to guess at how to make an Swa gland off...........as Wade's post this week.

oops.............wade just posted the photo honest he didn't really make that end off) lol
sorry mate hahahaha

 

[i=p/u]

5 core swa

 

[i=p/u]

il go with 5c but does say 42mm for 4core or go 4 core and 10mm earth

 

[44ALLAN]

5 core swa

4 core will suffice using armouring as your cpc mate as long as you gland it correctly and it passes all the relevant tests as the guys have already stated..............me.................5 core every time and dedicated earth core bolted and bonded and earthed to everything with 6mm brass nuts and bolts

 

[Engineer54]

SWA CPC sizes all in this PDF.

http://www.earthingnuts.co.uk/pdf/pvc_xlpe.pdf

That Earthingnuts pdf is more confusing than useful, far better to use this table when dealing with SWA CPC values and compliance's



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: yiv1584823175cms_table_yiv1559363916MsoTableGrid"]
[TR]
[TD="width: 118"]

Conductor CSA​

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

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: yiv1584823175cms_table_yiv1559363916MsoTableGrid"]
[TR]
[TD="width: 118"]

Conductor CSA​

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

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]

 

[Knobhead]

That table is worth it's weight in Copper.

Pitty no one ever follows it and insist on running needless CPC's

 

[i=p/u]

well i dont even need the extra core , but any job most of time i notice one tied to it but if i can get 5c which table dosent metion well

salt laden area sea front

 

[Silly Sausage]

i=p/u

I'm coming over to Northern Ireland on tonight's ferry.
My genius and intellect comes cheap at as much Guinness and smokes I can consume each evening after work.
PM me for phone number.

 

[i=p/u]

did you see the prices of tp-n switched fuse

- - - Updated - - -

the guy i got involved wants 1000 a week for pair....

 

[Engineer54]

well i dont even need the extra core , but any job most of time i notice one tied to it but if i can get 5c which cable dosent metion well

salt laden area sea front

Then i would personally run your SWA cable underground in a duct, sealed at both ends with a propriety duct seal compound. And make sure you pull the cable into the duct carefully, any damage to the sheath, will allow the salt laden water to corrode the SWA very quickly!! lol!!

 

[i=p/u]

i punched hole through ceiling and uncovered a beam , supposed to be holding building up, didnt look to healthy

the cable is inside but so is beam

 

[i=p/u]

is my actual pfc 400/0.07= 5.8KA i normal double but that = 8KA so more precise is 5.8?