Connecting Armoured Cable
- Thread starter kinhell
- Start date
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The outer armour should be earthed by the use of the correct glands & banjos.
The armour is of steel so should deflect a spade (should but not always) but if not because its earthed the protective device should trip.
Just to add you are meant to earth one end of armour only unless you are using it as the cpc, you are not meant to use it as a cpc combined with one of the cores.
Though not popular you can sometimes use the armour as the cpc. Best place to look it up as to which armour is suitable as cpc is TLC.
Though not popular you can sometimes use the armour as the cpc. Best place to look it up as to which armour is suitable as cpc is TLC.
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B
breezer
beleive it or not its true.
you can create an "earth loop"* that casue problems
it comes from using screend cable you should only connect one end to earth.
* right this minute i cant think of the right word / terminology
99% of the time its effect is never a problem, but it can be with some electronic kit
you can create an "earth loop"* that casue problems
it comes from using screend cable you should only connect one end to earth.
* right this minute i cant think of the right word / terminology
99% of the time its effect is never a problem, but it can be with some electronic kit
Nonsence.
Taught at colleges by non-knowing lecturers, and spouted around by regs-readers.
This is actually unfortunately a common mis-conseption. (spelling and grammer missing).
You are talking single core armours here, which I highly doubt you have ever come across before....
I know about the effect it can have on signal cables, though am struggling to think of the effect it would have on a mains cable?
Or have a look in the wiki!!
B
breezer
as i said it comes from using screend cables, and 99% of the time the effect is not noticed
B
breezer
Archer-small soldiers said:
Yes, I know about screen currents, but it doesn't apply ( or is not referred to) with regard to multicore armoureds.
To be fair to Paul he might have been refering to not exporting PME earths.
What effect can be introduced to a mains armoured cable by doubling up the armour with a core though?
In signalling systems I have come across the screen is earthed at one end utilising a local earth (functional earthing), none of the cores in the signal cable were used as earth.
B
breezer
as i also said i cant remeber exactly wht its called 
and as i also keep pointing out 99% of the time its not noticed
and as i also keep pointing out 99% of the time its not noticed
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