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Actually, it's one of many things ...

Hi, How long do fibre washers last? We've got a power shower in our bathroom. The water from the pump comes down a pipe that's hidden in a stud wall and then connects onto a pipe feeding a fixed head. The connection is inside the wall and seals with a fibre washer. What's concerning me...

What does Type S mean, speciflcally? (sorry if this is a hijeck, it's not meant to be).

Tell you what, I could drill a hole in the floor and poke a cable up so that we can dangle a few in the water. That ought to heat it up even more quickly :wink:

RF - thanks for that - I have to admit my heart sank when I suddenly thought of that so thanks for clearing that up. DESL - Underfloor heating - hehe I've seen that posted around here before :) I'm putting 12 downlighters in but they're going to be on two separate dimmers - I'm wiring...

Hi, I want to put downlighters into the kitchen ceiling. The lights I've got are mains voltage ones with an 8 inch length of heat resistant (I presume) cable and a plug on one end to go to the bulb. On the other end is a fitting to put some T+E into. Now it's just occurred to me that part...

I guess if I want a light fitting to line up with a joist I could fix a bit of 3x2 alongside it and drill into that. Thanks.

Thanks - I've saved that file - good info :)

I don't follow what you mean - surely the centre is not within the 25% - 40% range? Also, what happens at light fittings hanging from the ceiling in the middle of the room? I've been assuming that I use fittings that have the cable entering near the edge of the backing plate and then allow...

Thanks for clearing that up :D Ah, I'd been working from the edges of the holes. Still, I guess that's erring on the safer side as it gives them 3 diameters of meat rather than two. Better that than the other way round!

:)

Hi, I'm aware that if you're going to drill through a joist to feed cables though, you've got to be between 25% and 40% along, no closer than 2 inches from the edge and no closer than 3 diameters from the next hole. However, where exactly do you measure the 25 - 40% from? I've got some...

Hmm I see your point. So what do you do if there really isn't anywhere other than a ceiling or floor void in which to put the connector box?

Very interesting, I didn't know that. How does the body's impedance vary with applied voltage?

Allowing for cable path, from the point of connecting to the T+E it will be about 15 metres, so let's say 30m total, some of which is T+E and the rest is armoured. At 32A (the rating on the breaker) my calculations give a voltage drop of 7.1v allowing for the cables running at 70C. Aside from...

True, but assuming you're connected to ground, the current is going to be proportional to voltage. So, high voltage = high current.

PMSL :D No, but I was brought up near the border. Does it show? Mae fy hofrenfad yn llawn o lyswennod.

That's good to know, thanks. Taking cable straight in is going to be easier to do of course. I will drill upwards at 45 degrees so that the cable more naturally sits flatter to the wall. It obviously has advantages when it rains, too. I don't know the Ze value but the supply is TN-C-S so...

Ah cool, I've always done those things. If it's narrower (eg the CPC) then I usually double it over if it looks like it's not going to connect properly otherwise, and I always make sure it's long enough so that both conductors are tightened by both screws unless there's a good reason not to...

Hi, I need to replace the power feed to my garage. The garage is separate to the house - it's about 30 feet away across my back garden. The existing power feed is a 2.5mm 3 core armoured cable spurred off one of the ring mains. The cable emerges from the wall at the side of the house (no...