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Swa Banjo?

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Michael Bloomfield

Hello everyone, having a debate with colleague, concerning SWA connected into metal CU. Can anyone advise the exact reason for the banjo, brass washer with cpc tag, is it compulsory rather than it just looks nice.
Any thoughts sound reasons would be nice also is it a requirement under the regs?
 
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Many thanks for your reply Richard Burns which makes lots of sense, behind the use of a banjo.
Although i wish the locking nuts provided were just a fraction thicker to get a good purchase on when tightening but thats obviously cut backs, i quite often use piranha and flying earth lead, my companion debated that if earth continuity was present with as he said measured to 0.00 ohms on meter is that not sufficient continuity, i gracefully conceded the debate.
 
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Murdoch said:
So Pete999 - a banjo - fixed to the CU with a nut and bolt and a fly lead?
Click to expand...
Could do it that way I prefer a Piranha nut a far better and neater appr
Richard Burns said:
It has the banjo fitted so it must be fine!!!
What on earth did they manage to do to that gland to rip off the end of the clamp nut?
Click to expand...

They cut the Armour out of the equation Richard, because they didn't know how to do it properly, you can see from the pics that the Armour was/is /wouldn't reach thecorrect position to form a proper termination.
 
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Michael Bloomfield said:
my companion debated that if earth continuity was present with as he said measured to 0.00 ohms on meter is that not sufficient continuity, i gracefully conceded the debate.
Click to expand...

I don't quite understand this bit. What did your companion actually measure between to get this reading? How accurate is his meter?
 
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It is the reliability of the connection that is the issue, with a very short distance from gland to metal it is easy to get a 0.00Ω measurement but the contact area could be only 0.5mm² and this may not withstand an earth fault current, melt and and so leave the armour disconnected at the very time it is needing to be earthed.
 
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I use these when terminating into a plastic box. Great way to maintain earth continuity

[ElectriciansForums.net] Swa Banjo?
 
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Murdoch said:
Interesting thread .................. especially for those who insist on using 2 core SWA and use the CPC to the outer protection .....................

I prefer to use 3 core ..........
Click to expand...
When using swa for the ‘tails’ I use 2 core 25mm swa and a 16mm earthing conductor in parallel
 
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Michael Bloomfield said:
Hello everyone, having a debate with colleague, concerning SWA connected into metal CU. Can anyone advise the exact reason for the banjo, brass washer with cpc tag, is it compulsory rather than it just looks nice.
Any thoughts sound reasons would be nice also is it a requirement under the regs?
Click to expand...
[ElectriciansForums.net] Swa Banjo?
 
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Ian1981 said:
When using swa for the ‘tails’ I use 2 core 25mm swa and a 16mm earthing conductor in parallel
Click to expand...

So what's the price comparison between the above and 3 core SWA?
I haven't got the charts on me at the mo but isn't the armour on 25mm sufficient for the earth?
 
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Ian1981 said:
The armour would not be 16mm equivalent copper as I’m talking about the main earthing conductor
Click to expand...

That's what I was going on about. I will have to look that up as I thought it would be.
 
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