First little job on own house - advice

[eptesicus]

I come across a lot of swa nowadays with no bango or earthing nut on the armour

are the new breed no longer bothering earthing the armour

I'm surprised that something like that would have got passed initial verification on something only two years old. I thought that was a pretty big requirement for swa that goes out and underground (ie for the armour to have continuity back to the MET).

 

[Robson689]

I'm surprised that something like that would have got passed initial verification on something only two years old. I thought that was a pretty big requirement for swa that goes out and underground (ie for the armour to have continuity back to the MET).

Is it not earthed at the other end of cable?

 

[telectrix]

Thanks

Any particular reason why the fly lead csa would have to be so large? The csa of the line conductors to the supply of the junction box is 2.5mm, and then the swa from that is 1.5mm.

I was going to use 2.5mm for the fly.

you're right. it's just that i always have 6mm Gn/Y on the van but not always 2.5.

 

[eptesicus]

Is it not earthed at the other end of cable?

Not as far as I can see. This is the other end:

So there is nothing linking the armour OR the metal clad switch box to the cpc...

 

[loz2754]

SWA is only required to have the armour connected at one end (if the armour is not being used as a CPC), as already mentioned, so it may well comply.
However, I always connect the armour at both ends and at every joint, where applicable, just to be sure. I believe most sparks would do the same.

 

[Dustydazzler]

No fly lead to the box either , talk about rough as a badgers

 

[pc1966]

SWA is only required to have the armour connected at one end (if the armour is not being used as a CPC), as already mentioned, so it may well comply.
However, I always connect the armour at both ends and at every joint, where applicable, just to be sure. I believe most sparks would do the same.

If it is going to be earthed at one end I would always say it must be the supply end, lower Zs on the armour and less risk of something stupid being done at the load/accessory end.

Like the above example! If the armour is earthed, it is fortuitous by means of the back box and not by any acceptable connection.

To add: I would agree that it should be earthed at both ends if practical, exception usually is a feed to a TT'd building/caravan where the cable is TN and the end is a plastic gland as you are using only L & N and putting in a local rod for the RCD/onwards installation.

 

[pc1966]

I think what your 1st home exercise has shown is a Golden Rule you should apply on jobs - test and inspect first before you make any changes.

It might well be the installation broken/unsafe to begin with, and that is a whole extra set of donkey balls to suck when you go to test your own work and find something amiss.

 

[Dustydazzler]

I tend to only earth (bango) the supply end , just how I do it…

sometimes I banjo both ends but only when the wind is blowing east

 

[eptesicus]

Yeh, it is a bit poor isnt it. I thought my criticism may have been unjustified as i thought both ends had to be connected to the cpc. However, then i check the termination at the other end and A. it isnt connected there either and B. the metal back box isnt connected either.

I think what your 1st home exercise has shown is a Golden Rule you should apply on jobs - test and inspect first before you make any changes.

It might well be the installation broken/unsafe to begin with, and that is a whole extra set of donkey balls to suck when you go to test your own work and find something amiss.

You are absolutely right. I shouldn't have assumed that just because it was almost brand new/done a few years ago by a big firm that it was done correctly.

I am glad i took the time to inspect it/ask these questions first.