Main fuse question.

Bobble23 · Aug 6, 2012

I came across this the other day and was wondering if anyone could educate me. A TNC-S supply, into a relatively new box where the neutral and earth separate, line and neutral coming out of the top of the box via a 100A fuse to the meter. So far so simple, but next to the main 100A fuse are what look like two other main fuses, with no tails coming out out them.

I didn't want to take anything apart to have a look (my isolation needs were met at the CU), but can anyone tell me what the two mystery fuses are? I've tried to attach a photo below if that's any help.

Thanks.

[ElectriciansForums.net] Main fuse question.

Englishsparks · Aug 6, 2012

Are you a qualified electrician???????

Its a three phase incoming head

telectrix · Aug 6, 2012

3 phase with 2 fuses blanks. what makes you think it's TNC-S? where is the main earthing conductor connected to supplier's facility?

DurhamSparky · Aug 6, 2012

looks like TNS to me.... not a PME label ANYWHERE!!

sedgy34 · Aug 6, 2012

its a 3 phase TNS supply only using 1 phase
Q, is your earth tape going to stop direct contact around those fuse carriers?

telectrix · Aug 6, 2012

like the gn/y IP 44 tape on that old 3036 CU

needasparks · Aug 6, 2012

telectrix said:
like the gn/y IP 44 tape on that old 3036 CU

They use the same stuff on the nosecone of the space shuttle, works a treat so they say. Stops anything heading to earth at high speed.

My money is the install is a large old victorian house, who don't like spending money.

Farmelectrics · Aug 6, 2012

Bobble are you a spark

sedgy34 · Aug 6, 2012

needasparks said:
They use the same stuff on the nosecone of the space shuttle, works a treat so they say. Stops anything heading to earth at high speed.

My money is the install is a large old victorian house, who don't like spending money.

My money is on bobble being a Electrical Trainee lol