Pyro Meter Tails!

[Piratepete]

:willy_nilly: Domestic client called me to quote for some sockets and a CU change. Stunned to see the meter connected to the existing fuse box by 2 core pyro using the bare sheath as the earth conductor. Was this common practice in the 70s and did it comply back then or even now?

The supply is 60 Amp, the Fusebox is some 4 metres from the meter. The termination of the cable is enclosed at the fusebox end but not in the cutout/meter box where the two single insulated tails connect directly into the meter. The cable diameter (bare) is 13.39 mm. Can't seem to find this in my tables to check the rating.

Is there anyway I can reuse the pyro, as replacing it will be a nightmare! Because of the distance, I'm thinking of installing a 60A switch fuse in the meter box and try to get the cut-out upgraded to 80 Amps (minor point of compliance).

Cheers
Pete

 

[davesparks]

There's already a perfectly good bit of MICC there, why would he want to install inferior cable to replace it??

 

[shanky887614]

There's already a perfectly good bit of MICC there, why would he want to install inferior cable to replace it??

i only read latest couple and confused myself so edited it when i realised my mistake.

the only reason i was going to mention swa was because of the rcd requirement for new installs less than 50mm in the wall and not mechanically protected etc.

micc doesnt need to be because the outer shieth is the earth

 

[davesparks]

So how would you propose to fit a 1" pyro gland onto a KMF switchfuse?
All of the ones I've seen have been plastic jobbies with nowhere to fit a gland.

 

[shanky887614]

So how would you propose to fit a 1" pyro gland onto a KMF switchfuse?
All of the ones I've seen have been plastic jobbies with nowhere to fit a gland.

bs88 switched isolator

 

[davesparks]

You just open yourself up for it don't you!

Switchfuse or switch fuse disconnector would be a bit closer to the mark.

Which is different to a fused switch or fused switch disconnector.

 

[shanky887614]

You just open yourself up for it don't you!

Switchfuse or switch fuse disconnector would be a bit closer to the mark.

Which is different to a fused switch or fused switch disconnector.

personally id just use a 100amp main switch or whatever like everone else does on new builds

 

[davesparks]

Oh dear, a 100Amp main switch is just that, a switch, it does not include any form of OCPD.

An OCPD is required to make this cable in to a submain due to the distance, ideally an HRC fuse rather than an mcb to give it some hope of discriminating.

 

[shanky887614]

Oh dear, a 100Amp main switch is just that, a switch, it does not include any form of OCPD.

An OCPD is required to make this cable in to a submain due to the distance, ideally an HRC fuse rather than an mcb to give it some hope of discriminating.

why not use a mainswitch so there is an isolator, ocpd aditional ofcourse as well.

 

[davesparks]

You said you would use a 100amp main switch or whatever, which reads as though you would install a 100Amp main switch only or something else.