Onevery last question; why do the DNO bother to install an incoming service fuse if on TT systems, the fuse is unlikely to blow and protect the circuit?
Submain breaker/fusing
- Thread starter mbga9pgf
- Start date
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Not with the live to neutral loop impedence value measured it wont!
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Should my garage sub main have rcd protection or is this just for a TT supply? The electrician who designed the circuit and did my CU has it on a switchfuse but no RCD, the supply is TNS.
Even if you measure 0.6 ohm L-N impedance, 383A PSC will blow a BS1361 service fuse on a dead short. Not necessarily quickly mind you... but under a second for a 60A, 10s for 100A.
It's on TT supply's
What if they are not seperate holes, what if the sparky has run a hacksaw beween all three holes so they are essentially one hole?
That is an acceptable way of preventing eddy currents, providing the apropriate IP rating is still maintained.
I was wondering that too, now that it terminates into a plasting box.
I'd have kept the metal box and just thru crimped the tails straight onto the SWA.
SWA was earthed at supply via the gland banjo into 16mm terminating at an earth block that was installed in the meter box... so it is earthed.
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