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Ask The Trades › DIY Forum › Electrical Questions › elec shower

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elec shower (Read 5298 times)

spot

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elec shower
Sep 9^th, 2004, 6:57pm

???
heres one for you lot,
i have a 9.5kw shower and at the moment it has a 2.5m
cable going to the pull switch! then from there a 10m cable going to the c.u.
I know i will have to replace the 2.5m cable for 10m.
But here is the question.... the c.u has no RCD fitted so the shower is not protected. can i fit an in line RCD to the shower circuit??? rather than change the whole C.U ?

« Last Edit: Sep 12^th, 2004, 5:37pm by LSpark »

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Beanzy GDPR opt-out Total Thanks: 0 For This Post: 0	Re: elec shower Reply #1 - Sep 9^th, 2004, 8:23pm Yep. Can buy them complete with MCB from TLC, or Screwfix, but may get better price from your wholesalers. Don't forget to sort out the earth bonding too. If unsure re this post a follow-up one on here and will update you.
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The_Trician Trade Member Offline Posts: 7721 Total Thanks: 8 For This Post: 0 Gender: Trade: Electrician	Re: elec shower Reply #2 - Sep 9^th, 2004, 10:38pm Don't know what make or age your CU is; but you might be able to get something which will fit straight into it. More info needed though. TT
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LSpark Global Moderator Trade Member Author Offline Posts: 8069 Total Thanks: 3 For This Post: 0 London, UK United Kingdom Gender: Trade: Electrician	Re: elec shower Reply #3 - Sep 10^th, 2004, 12:04am Yep, cable will need to be changed, if it's a modern board you can get a RCBO, which is a combined RCD and a MCB (fuse), if it's an older board, the alternative is to fit a seperate box with a RCD in next to the board, and run the shower through this, the RCBO or RCD would been to be 45A.
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Lectrician

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Re: elec shower
Reply #4 - Sep 10^th, 2004, 1:16pm

Of course, there is actually no requirement to provide an RCD for a shower circuit, as long as the disconnection time of 0.4 seconds can be achieved with a fuse or MCB, which in a domestic environment with 10mm shower cable should be fine. I would be extremely surprised if the Zs would be exceeded.

But then, for a few quid for an RCD, it would make you feel a little safer - mine has an RCD Wink

Yep, upgrade your supp bonding as well.

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ChubbyPhaseWire GDPR opt-out Total Thanks: 109 For This Post: 0	Re: elec shower Reply #5 - Sep 10^th, 2004, 2:14pm Protection against electric shock Bathrooms and shower rooms Disconnection times for circuits supplying current-using equipment are no longer reduced to 0.4 s. However, 30 mA RCDs are to be fitted to the circuits of certain items of current-using equipment (see Table 1B)GN7.
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spot

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Re: elec shower
Reply #6 - Sep 10^th, 2004, 6:53pm

Cheers for the info guys........
yes the C.U is an old type and cant hold an rcbo which would have been a top job! if i put in a new shower C.U would i have to run tails to the mains terminal block or could i get the supply from the original CU? ???

can you run-through the earth �bonding for the shower!
many thanks
spot......................................... Wink

« Last Edit: Sep 10^th, 2004, 7:00pm by spot »

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plugwash Administrator Offline I love YaBB 1G - SP1! Posts: 1383 Total Thanks: 0 For This Post: 0 Trade: Not Specified	Re: elec shower Reply #7 - Sep 10^th, 2004, 7:47pm what kind of CU is it there presently remember the wylex standard CUs with isolators below 100A are not meant to take any protective device over 30A and good f**king luck getting proetctive devices for any other brand of that age
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Beanzy

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Re: elec shower
Reply #8 - Sep 11^th, 2004, 12:40am

Yes you'd have to sort the meter tails out. Which means you'll have to remove the main fuse and take full precautions. I'd hold fire on any of this one unless you have the necessary test kit. It's safer and probably much quicker to get a pro on this one, not really the realms of DIY. If it were a modern CU which just required the relevant MCB and you had access to test kit, or someone who knew how to drive it, then you could possibly do it. There's too much scope for error with this one as it is.

On the earth bonding issue this can help explain much;

http://www.niceic.org.uk/downloads/NL139supp.pdf

Also get hold of the IEE on site guide if you do or intend to do any DIY electrical work, it's a good base to get proper info before deciding which jobs you may want to do yourself, and which may be a can of worms for you.

« Last Edit: Sep 11^th, 2004, 12:41am by Beanzy »

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LSpark Global Moderator Trade Member Author Offline Posts: 8069 Total Thanks: 3 For This Post: 0 London, UK United Kingdom Gender: Trade: Electrician	Re: elec shower Reply #9 - Sep 11^th, 2004, 1:39am [quote author=plugwash link=1094752656/0#7 date=1094842075]what kind of CU is it there presently remember the wylex standard CUs with isolators below 100A are not meant to take any protective device over 30A and good f**king luck getting proetctive devices for any other brand of that age [/quote] lol, calm down
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