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Looked at a very tidily done caravan site metre room today and noticed that the metal-enclosed fused isolators all had the phase and neutral tails entering and exiting the metal enclosures through seperate k.o.s (no slots inbetween). Otherwise, the installation looked remarkably well installed...

Hello folks, Found a BS88 35A (20kA breaking capacity) being used on a shower circuit in a house but there aren't any loop impedance readings in the regs to check against. I didn't see any info regarding type on the fuse. Can they be used in domestic C.U.s & if so where do I find the max loop...

Hello folks. Sorry for the quality of the picture but looking at it I can't decide if this supply is TT or TNS. It's definately not TNCS (which is good as it's a static caravan site). As you can see, there's what appears to be an earth rod going into the ground which is also connected to the...

Hello folks, I'm usually in the electrical section but nipped over here to see if you can help me with something. I've got an old boiler in my house (queue the wife jokes), which is a Baxi FS501OF (it also has FS501SOF on it). Coming from the LP722 control panel there are three white cables...

Just pricing up a light industrial job. It's to install a bank of sockets in a warehouse that calibrates measuring instrumentation and the customer doesn't want r.c.d. protection in case of nuisance tripping. The warehouse doors are about 8 mts away and so the sockets could reasonably be used to...

Would replacing the m.c.b.s on the non-r.c.d. protected side of a split load c.u. with r.c.b.o.s (and some re-configuring of the order of circuits) meet the 17th standard? Not necessarily the cheapest option, I know, but it's the one method I rarely see mentioned and I wondered if there was...

Are there actually any specific regulations regarding the need for local isolation of a shower and fan in a bathroom? I did a p.i.r. yesterday on an apartment and noted there was no isolator (other than the m.c.b.) for the shower and none for the bathroom fan. I'm typing the report up today...

Evening folks, In the middle of doing a few jobs on an older domestic install, I've noticed the shower circuit (which I wasn't originally going to work on) has a separate c.u. which is in an unsafe state and no local isolation (only the c.u. itself which is in the basement). I've told the...

Hello everyone, Whilst I've got the boards up in most rooms in my house over the next few days, I was thinking of running 2 coax (ct100) and 2 cat5e cables to a point in each room as I may not get another chance. Would you say this is enough/ too much etc.? Cheers

SWA buried underground in garden going through pvc piping for future removal if needed. What reference would you say? Is the piping treated as conduit and therefore ref.meth. 3 (Installation Method 7)? Regards, Anthony

Evening folks, What's the best lock-out device for a Wylex DP Main Switch? I've been looking on here for one: http://www.reecesafety.co.uk/Circuit%20breaker%20lockouts.htm and here http://www.thefusecompany.co.uk/ I use one of the 'Toggle Locks' for mcbs but it isn't great on the main...

Worked on a static caravan site for the first time today and not sure about some of the installation methods used. The TNCS supply to the outdoor joint boxes seems fine: 16.0mm SWA into the meter and henley block, then through a 80A mcb and a 30mA rcd. The things that I question are the cable...

Hello folks, Both in the Regs (528-02-02) and OSG (p.55) we're warned about installations run or fixed alongside hot pipes but they give no safe distances for C.U.s, for example. The C.U. in my house is approx 100mm from a vertical hot water pipe. Is this too close? What would be the minimum...

I've a few questions about the supply characteristics of a job I went out to last week, if anyone fancies commenting. 1. Does anybody know why a supply with a PME notice on it, appears to be fixed up as a TNS system? and 2. There's two incomers. Will one be going to feed next door...

The oft reviled “meter monkey” has come in for a bit of stick by just about every spark I’ve come across on the usual sites [screwfix, diynot, iet]; but are we being too harsh? I came across one today who’s made me think. Okay he’s a bit of an exception, I think, but still. My naturally superior...

I understand that today’s C.U.s are enclosed and are therefore ok to mount on untreated wooden surfaces, but if you decide to bring the cables in from the back and cut out holes through the C.U. and wooden backing board, does this contravene any regs, such as 422-01-02? Cheers

It seems every time I come across previously buried SWA, that rarely do I see the use of protective tiles and warning tape; and the depth is usually too shallow as well. Even conscientious sparkies I know rarely use tiles and tape though they do try to bury it about 18inches down. Reg.522-06-03...

Sorry if this is a bit basic but just wanted to make sure. Going on a cruise around Italy, Spain etc. tomorrow for a couple of weeks (ok...I'm just showing off now! 8) ) and wondered if I'm supposed to completely turn off the gas before I go and re-ignite the pilot on the Baxi FS501OF when I...

Hello folks, Is it acceptable to re-use sections of old metal conduit on a house re-wire as long as you earth each piece to the socket/switch it leads to, or should it be completely ripped out and start again? Cheers, Ants

From what I’ve noticed, metal surface back boxes only ever seem to have 20mm knock outs. How do you attach 25mm conduit to them? Is there a reducer to allow 25mm to enter the 20mm knock out or do you use some kind of drill bit to enlarge the hole? I’d rather use 20mm conduit and singles to be...