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Topic Title: main switch
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Created On: 11 February 2013 07:18 PM
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 11 February 2013 07:18 PM
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jcm256

Posts: 1871
Joined: 01 April 2006

Older type consumer units had a fixed double pole 60 or 100A usually at the right hand side of the unit. Then along came the now din-rail type to cater for the 17th addition and RCDs etc. Should you remove the din-rail main switch and replace it with a RCD to make more room. Never seen any regulation, although even you don't want the main switch, the retailer don't want it, so the spare ones in the garage will have to go to the skip. Must say though if you use an RCD as main switch and it goes faulty (had one person batter it with a brush) it's a pig changing with the mains tails direct in so maybe (other than altering manufactures supplied article) you should leave the main switch in place. The garage consumer unit you can isolate so no problem. The separate shower consumer unit, suppose it would depend on where you connected the tails. Just asking in case some future nick would nit pick.

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 11 February 2013 08:46 PM
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DOUGIE1000

Posts: 4165
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Are we talking about Hahn switch RCD for full property or smaller shower/garages broad.

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Dougie
Power Plus Electrical.co.uk

My mission is to live as long as possible......so far so good!
 11 February 2013 09:00 PM
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peteTLM

Posts: 3153
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are we implying changing a CU main switch live?

Who would want a second hand main switch, no one. Handy for van stock emergencies, but otherwise worth nothing. Hardly surprising.

A cheap dirty option to change the main switch for an RCD. What happened to ' minimise inconvinience in the event of a fault'?
Questions generally have a ? somewhere in them.

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Lack of planning on your part doesn't make it an emergency on mine....

Every man has to know his limitations- Dirty Harry
 11 February 2013 10:41 PM
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ebee

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WHAT ?

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Ebee (M I S P N)

Knotted cables cause Lumpy Lektrik
 11 February 2013 10:48 PM
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DOUGIE1000

Posts: 4165
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After reading twice I gave you too Ebee.

Main switch replaced for 1 rcd - bad idea

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Dougie
Power Plus Electrical.co.uk

My mission is to live as long as possible......so far so good!
 11 February 2013 10:56 PM
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peteTLM

Posts: 3153
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I usually try to avoid code words, but WTF!!!

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Lack of planning on your part doesn't make it an emergency on mine....

Every man has to know his limitations- Dirty Harry
 11 February 2013 11:07 PM
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ebee

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Well I`m a "Front Ender".

I come from the days Prior RCD when a six way wylex rewireable was bog standard.

Then RCD started to become the rage.

It was a front ender or nothing.
There are millions, thousands, hundreds of front enders about.

Later on the split load came in losing RCD protection for lighting.

Then more recently dual RCDs.

Most recent rewire I did was dual RCDs each with two/three MCBs plus 4 RCBOs

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Ebee (M I S P N)

Knotted cables cause Lumpy Lektrik
 11 February 2013 11:24 PM
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antric2

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Who remembers Stanley Unwin!!
Has he been reborn!!
 12 February 2013 04:08 PM
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jcm256

Posts: 1871
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Well was asked, would it be ok to do this in order to make two spare ways, had to mumbled some reply. Was only asking is there some regulation that a RCD may not be used in place of a main switch. 100mA S type for TT system, protecting the whole consumer unit as required that sort of thing. In answer to your suggestion, no one will be doing anything with live mains tails, not allowed. (While I am around anyhow)

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jcm
 12 February 2013 04:42 PM
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AJJewsbury

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Was only asking is there some regulation that a RCD may not be used in place of a main switch

Only 314.1 - avoid danger and minimise inconvenience in the event of a fault, etc. Very open to interpretation - anything between single RCD incomer and all-RCBOs has been said to comply or just meet minimum requirements. 'Standard practice' these days seems to be at least two RCDs with circuits (especially lighting) spread between them - to do "worse" than that could leave you open to criticism. But on the other hand, if that's what the customer wants and understands and accepts the implications - why not? (If the money saved were spent on a thermostatic valve for the DHW system, it may well be a safety improvement overall!)

- Andy.
 12 February 2013 05:00 PM
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tattyinengland

Posts: 786
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If it's two spare ways you need, fit a small "garage" DB in. That way you only have to worry about those two circuits only.

I don't mind one front end RCD (There's better ways to do the job though), but that's always a contentious issue.....
 12 February 2013 06:27 PM
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jcm256

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Thanks, A decade or so ago, when electricians were allowed to do there job without the large book and hangers on looking for a cut out of any small profit , on a TT system Tails went from the cut-out to an ELCB (later changed to a free stand-alone RCD) then via tails to the consumer unit. They are still in use today. So therefore, RCDs 3 P OR SP as the main-switch are still in use as at now 2013.
Thanks, Mr AJ consumer units now come with options to support 17th, split load, dual RCD, High integrity dual or triple RCD, or no integral wiring accessories and you provide your own configuration But, they have all one thing in common a standard (usually) a 100amp din-rail mounted main switch. So taken your advise could leave you open to criticism, therefore better let the main switch stay in place.

Edited: 13 February 2013 at 09:09 AM by jcm256
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