What would you do here.

Andy5678 · Jan 5, 2019

Looking at this job, I haven’t touched anything yet so any faults you find are nothing to do with me.

The top switched fuse feeds a CU in the house.

The bottom one is old and the customer would like to use it for another CU in an out building. A 16mm SWA has been run to the box.

Now I am struggling how to think about terminating it all and doing a neat job.

First thing would be to seal the hole and stop the snails.

I’m not sure about using the old switch fuse as the holes cut out on the top don’t look right and is a cover missing? I have seen new ones of these available from wholesalers so that could be an option. But could be a tight squeeze.

There is room for a second meter box along side which could house the 2 switches or just the the second one and then would just need to worry about getting meter tails through.

Would like to hear your thoughts so I can come up with a plan.

Thanks.

[ElectriciansForums.net] What would you do here.

ferg · Jan 5, 2019

For me another meter box for the 2 switch fuses is the best option.

Silly Sausage · Jan 5, 2019

deleted

Andy5678 · Jan 5, 2019

Yes and then have the metallic fused switches. Not sure about running tails from box to box. Not sure what’s the largest diamater of conduit/copex available to fit 2 x 25mm tails plus 16mm earth.

Andy5678 · Jan 5, 2019

I think it might a split concentric cable? It’s defiantly not SWA. Sleeved for double insulation possibly, not sure didn’t want to poke about too much at it.

mattg4321 · Jan 5, 2019

Run some large ducting between the boxes. 50mm should do it.

Cid · Jan 5, 2019

Is the meter box not the responsibility of the DNO?

Andy5678 · Jan 5, 2019

They must have been recently to fit the smart meter, take it nothing was said about the state of it.

Cid · Jan 5, 2019

I'd get rid of both the switches and install DP isolator switches. Power the out building the usual way. I don't see the purpose of multiple cut out fuses.

Andy5678 · Jan 5, 2019

Cid, i would prefer to keep the fuses. Not going into why as want to keep the discussion on the set up.

KEV 1 N · Jan 5, 2019

Why is the bottom switch not used? Could it be defective (possibly damp / moisture ingress?) and they’ve just left it place and fitted new one above?
I know you’d rather keep the fused switches ,but Could you not install a small DB with a main switch and two 63amp mcbs, so you’ve got isolation and overcurrent protection for both out going cables and you don’t have faff on with Henley blocks or try to link those old fused switches together?

ferg · Jan 5, 2019

I prefer switch fuses for discrimination.

KEV 1 N · Jan 5, 2019

ferg said:
I prefer switch fuses for discrimination.

Was just thinking out aloud with that idea, was thinking of the tidiest way to do it, but of course Zs readings etc would have to be taken into account for suitability of protective device.

Andy5678 · Jan 5, 2019

KEV thought about doing that but discrimination with MCBs may not be good with the main house being on it too, I agree it would be a neat way of doing it.

Bellendian · Jan 5, 2019

Do cgd do a double fuse version of their switchfuse assembly?
Wondering if you could have a single enclosure with 1 main switch and then 2 fuse holders supplying each submain? Like the 63A breaker approach, but retaining discrimination.