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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.

photo.jpg
 
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E

Englishsparks

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

Its a three phase incoming head
 

telectrix

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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?
 
S

sedgy34

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

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

sedgy34

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
 
D

DurhamSparky

now now chaps.... just because the training centre never had a 3 phase service head....
 
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