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Ze=0.31ohms. Circuit lengths: CU to switch approx 60feet + switch to lights approx a further 60 feet = Total 120feet. CU to switch is in 1.5mm (new wiring) switch to lights is in 1mm (existing wiring). There is also at least 1 (probably 2) junction boxes in the circuit. Thanks Keith

Unfortunately it doesn't have one for this circuit. As I stated earlier, this circuit wasn't completed when the CU was installed. Just connected to a junction box ready for final connection when lights were finally installed. Am I able to measure it simply myself with the right equipment...

No. They are on a circuit totally on their own. Am I right in saying that the simplest way to overcome this problem is to take the feed for these lights off the downstairs ring via a 5A fused spur unit? (ie disconnect from MCB). Am I still OK to incorporate the light switch (in the lower...

Pardon my ignorance, but can you explain further. I know the basics about electrics but am not an electrician. "you could try a type C earth fault loop impedance..." - Do you mean carry out an impedence test (out of my skill range/no meters to test) or is this the description of a C type MCB.

Yes I meant 6A.

No, there is nothing else on this circuit at all. We have only recently (3 months ago) had the old Consumer Unit (most of the house has been re-wired) replaced with a split load (RCD) CU by a qualified electrician. It contains all Wylex Type B MCBs. However, I have only just completed the...

Hi, I'm having problems with 2 x 500w floodlights :cry: . They are wired in parallel and operated from a single (10A rated) fixed switch (ie not via PIRs). They are on a newly installed circuit on their own on an SP Type B 6kA (wylex NSB06) MCB. When I operate the floodlights via the switch...

I thought that using a HepVo antisiphonic trap also eliminated the need to fit air admitance valves? Quote from HepVo info "HepVo actively eliminates negative pressure within the waste system by opening and allowing in fresh air until a state of equilibrium with atmosphere is reached. This...

Thanks. Much appreciated. As a matter of interest, what is the issue (foul smells, drainage capacity or other)

I am in the process of moving a washing machine to a new utility room on ground level. I will install a HepVo antisiphonic trap on the washer waste. The waste will feed directly into a gulley (not soil stack) which is on the opposite wall. This means that I will need to run the waste...

I want to install a new shower in a bedroom. However, whilst the waste pipe run is straight (apart from bends to join to soil stack & shower tray), it is 8 metres away. I intend to use a HepVo antisiphonic trap at the shower. Having looked at the Building regs, I am a little confused as...