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Subject Topic: garage electrics Post Reply Post New Topic
Persondenmau
01/8/2014 at 6:58pm
 Location: north east uk
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any of you guys got any thoughts on my garage problem.


my problem started when garage electrics just stopped working.

on removing the little consumer cover, I discovered two wires welded together and the 32B mcb well scortched.

I realise using my diy arc welder may have caused this.

BUT my concern is that the MCB did not trip at the heat and overlode...surely this is what it is there for.

any thoughtsI do intend to get a proper electrician to sort it.

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Gerrrraway den!


Personfirebasher
02/8/2014 at 9:36am
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Sounds more like a loose connection than overload causing the heat, take it the two wires are line feed for ring main.

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Smoke alarms save lives!


Personlockie
02/8/2014 at 9:45am
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Maybe the sudden current draw caused the mcb to fail before it could react ?

Perhaps the welder is faulty or requires a higher load mcb like a shower requires ?

It could also have been a poor connection and the load just melted the wire.

Garage consumer units are cheap enough to replace. I would be more concerned as to why the consumer unit the house it feeds from didn't trip it's rcd unless it is not on that circuit ?


Personsaxo1
02/8/2014 at 10:15am
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Most likely a loose connection or possibly damp causing a corroded connection.
An MCB will react to overload before it gets to the situation described.
If the 2 wires are the ones going to the MCB they will be Phase and neutral no earth wire involved so the main house RCD won't trip.
saxo1


Persondenmau
02/8/2014 at 11:21am
 Location: north east uk
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the garage is run from the house consumer unit Via a B32 mcb......this had not tripped.

as regards wiring loose, negative! all wires were well secured.

the point made about fitting a higher rated mcb, surely if this 32amp didnt trip then a higher rated one, say 40amp is even less likely to trip...wouldn't you think.

also the little welder is not wired into the garage circuit, it has a 13amp plug fitted... surely this 13amp fuse should blow before 2.5mm garage wire gets so hot it melts. your comments are appreciated and thought prevoking.

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Gerrrraway den!


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Persondenmau
02/8/2014 at 4:20pm
 Location: north east uk
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SORTED!

electricians says it has been a LOOSE connection only!

so well done everyone.

Ref me saying all the connections were tight,
electrician said yes they are now, because everything has overheated and bonded to the screws.



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Gerrrraway den!


Personfirebasher
06/8/2014 at 9:33pm
 Location: West Yorkshire
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"If the 2 wires are the ones going to the MCB they will be Phase and neutral no earth wire involved so the main house RCD won't trip."

Shakes head, if phase and neutral welded together the main fuse to the house would have blown !!, phase only to mcb, neutral to bar !!

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Smoke alarms save lives!


Personsaxo1
06/8/2014 at 10:47pm
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"Shakes head, phase only to mcb, neutral to bar !!"

Shakes head!
I take it that you have never heard of a double pole MCB oh dear!

saxo1


Personfirebasher
07/8/2014 at 9:20am
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Shakes head yet again, not with phase and neutral to one connection, oh dear !!!

-------------
Smoke alarms save lives!


Personsaxo1
07/8/2014 at 11:19am
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Who said anything about Phase and neutral going to one connection?
http://www.neweysonline.co.uk/schneider-mcb-type-b-10a-double-pole-240-440v-ac/1050076839/ProductInformation.raction

A double pole MCB has 2 terminals Phase and neutral so that all live conductors are isolated by the one switch.
You need to read what was said!
Shakes head !


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PersonSGThomas
07/8/2014 at 2:20pm
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Quote: Originally posted by saxo1 on 07/8/2014
Who said anything about Phase and neutral going to one connection?
http://www.neweysonline.co.uk/schneider-mcb-type-b-10a-double-pole-240-440v-ac/1050076839/ProductInformation.raction

A double pole MCB has 2 terminals Phase and neutral so that all live conductors are isolated by the one switch.
You need to read what was said!
Shakes head !


I just love it when you talk dirty!



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