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Can any electricians check out my shed wiring?

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DRZ4Hunned
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PostPosted: 13:02 - 21 Aug 2016    Post subject: Can any electricians check out my shed wiring? Reply with quote

Following on from this thread: https://www.bikechatforums.com/viewtopic.php?t=313954&highlight=

I've attempted to wire up my shed with four double sockets in a radial circuit, but it doesn't seem to work...

The power is fed from a 13A plug from the house which runs through flex cable into the consumer unit and I've wired the consumer unit as such:

https://i.imgur.com/dWLgcsw.jpg

I've used my multimeter to do a continuity test from the plug to the MCBs to check that it's all kosher, everything seems fine apart from the live.

How does the live get from the RCD on the right to the fuses on the left? Is it through the buzz bar at the bottom?

Anything stupid that I've missed here? Embarassed

(The incoming blue flex is only like that for test purposes, route it properly when it works)
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WD Forte
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PostPosted: 14:15 - 21 Aug 2016    Post subject: Reply with quote

They're not fuses they're breakers/MCBs
forget them for a minute
I would disconnect the blue cable from the mains
and get the meter out set to continuity or low resistance

then with the main switch in the on (UP) position do a continuity test between
top left and bottom left and top right bottom right clamp screws
ie 1 to 2 and N to N

there should be continuity across them
No?
bad main switch, get another

yes?

check bus bar connections are good sound and tight
and they have continity between 2 ( bottom left) on the main switch
and the corresponding screws (bottom) of the mcbs

NO? refit and check again

OK?
Now with the mcbs in the ON ( up) position do a continuity test across them
flip them few times for hell of it if you like
No? bad MCBs
OK?
It should all work now
Also check you're clamping the conductor wires not the insulation
when fitting cables to the RCD MCB terminals

A bit of green/yellow sleeving on the earth wires wouldn't hurt
and be good practise

Take your time and work safe
check it's all tickety boo before powering up the mains

HTH
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DRZ4Hunned
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PostPosted: 14:32 - 21 Aug 2016    Post subject: Reply with quote

Thanks for the info, I've done continuity tests between clamps of the MCBs (top to bottom) and it appears the only one that's not getting continuity is the one second from the right (with the yellow test button).

So I guess that's my problem! I'll get a new one ordered (even though this is a new one... Mad )

I've checked that the sockets work by bypassing the consumer unit and wiring the first socket in the circuit straight into the 13A lead and they all work, so it's definitely a fault with the MCBs.
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wristjob
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PostPosted: 17:14 - 21 Aug 2016    Post subject: Reply with quote

the 2 brown wires appear to be connected to seperate breakers and nothing else
blue goes through breaker on right
brown is connected on the top but nothing on the lower terminal
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DRZ4Hunned
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PostPosted: 17:19 - 21 Aug 2016    Post subject: Reply with quote

wristjob wrote:
the 2 brown wires appear to be connected to seperate breakers and nothing else


I think the two breakers are connect via the buzz bar at the bottom? (you can only just see it at the bottom of the two MCBs in the picture). Unless that isn't for the live?
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wristjob
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PostPosted: 17:26 - 21 Aug 2016    Post subject: Reply with quote

op has lower bar connected as earth
diagram on breaker shows it connects top terminals to lower terminals
neutral is ok on right hand breaker
live is connected to nothing
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DRZ4Hunned
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PostPosted: 17:40 - 21 Aug 2016    Post subject: Reply with quote

wristjob wrote:
op has lower bar connected as earth
diagram on breaker shows it connects top terminals to lower terminals
neutral is ok on right hand breaker
live is connected to nothing


I have a similar setup to this:

https://www.needselectricalonline.com/%5Cimages%5Cproduct%5Cextralarge%5C20110615131959Europa%20GRG32E%20open.jpg

With the brown buzz bar at the bottom that connects all the breakers, which you can't really see on my picture. So surely that connects the lives?
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wristjob
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PostPosted: 18:00 - 21 Aug 2016    Post subject: Reply with quote

with that picture it makes more sense.
is the blue flex the incoming feed?
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DRZ4Hunned
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PostPosted: 18:04 - 21 Aug 2016    Post subject: Reply with quote

wristjob wrote:
with that picture it makes more sense.
is the blue flex the incoming feed?


Yeah the blue's the feed (13A plug on the other end)
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bugeye_bob
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PostPosted: 18:10 - 21 Aug 2016    Post subject: Reply with quote

have you checked the fuse in your lead ?
when plugged in doe the RCD test button cause the rcd to trip,
if not you have no supply coming in . . .
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DRZ4Hunned
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PostPosted: 18:45 - 21 Aug 2016    Post subject: Reply with quote

bugeye_bob wrote:
have you checked the fuse in your lead ?
when plugged in doe the RCD test button cause the rcd to trip,
if not you have no supply coming in . . .


Yeah the lead's fine, I've currently got it plugged into the sockets and they're working, so it's the RCD which seems to be faulty from my continuity checks.
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331X2
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PostPosted: 22:28 - 21 Aug 2016    Post subject: Reply with quote

Have you fitted the bus bar?

Edit: I see you have now I've read the posts! You need it in the live outgoing of the RCD and the bottom of the breakers, make sure you've got hold of it properly with the terminals as it's easy to have the finger of the bar fall behind the terminal as it closes up.

One test lead on earth, meter on VAC and follow it from top of RCD where it comes in, bottom of RCD, bottom of mcb, top of mcb. Post up where you stop getting voltage and it'll be easier to diagnose.

Edit 2: double the single core cable over where it's terminated by screw and sleeve the CPC you rough bastard Mr. Green [/list]
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drzsta
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PostPosted: 22:39 - 21 Aug 2016    Post subject: Reply with quote

Why have you even bothered with a CU connected from a plug anyway? Even if you house has a 15th/16th edition board it will have RCD protected socket ccts. You have no discrimination and its a waste of money IMO.
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DRZ4Hunned
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PostPosted: 23:37 - 21 Aug 2016    Post subject: Reply with quote

drzsta wrote:
Why have you even bothered with a CU connected from a plug anyway? Even if you house has a 15th/16th edition board it will have RCD protected socket ccts. You have no discrimination and its a waste of money IMO.


To be honest I initially had no idea what I was doing, the most sparky thing I've done before is wire a plug, so this is all new to me.

At least with this setup I can install SWA and have it connected to the house CU in the future.
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DRZ4Hunned
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PostPosted: 23:41 - 21 Aug 2016    Post subject: Reply with quote

Lee Wright wrote:
Have you fitted the bus bar?

Edit: I see you have now I've read the posts! You need it in the live outgoing of the RCD and the bottom of the breakers, make sure you've got hold of it properly with the terminals as it's easy to have the finger of the bar fall behind the terminal as it closes up.

One test lead on earth, meter on VAC and follow it from top of RCD where it comes in, bottom of RCD, bottom of mcb, top of mcb. Post up where you stop getting voltage and it'll be easier to diagnose.

Edit 2: double the single core cable over where it's terminated by screw and sleeve the CPC you rough bastard Mr. Green [/list]


Knew I'd get shamed by a sparky... Embarassed It'll all be tidied up when I get it working. Smile

I've already done those tests to check the MCBs/RCD and the RCD doesn't appear to be working, contacted the seller and he's sending me another out.
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WD Forte
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PostPosted: 01:04 - 22 Aug 2016    Post subject: Reply with quote

drzsta wrote:
Why have you even bothered with a CU connected from a plug anyway? Even if you house has a 15th/16th edition board it will have RCD protected socket ccts. You have no discrimination and its a waste of money IMO.


The point is, if the garage/shed circuit develops a fault
the RCD in the small CU shuts off the power locally
This means 'er indoors can watch Corrie without interruptions
if the OP decides to chew through the cable.
Fitting these boxes is standard practise in sheds, garages and caravans
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drzsta
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PostPosted: 07:58 - 22 Aug 2016    Post subject: Reply with quote

WD Forte wrote:
drzsta wrote:
Why have you even bothered with a CU connected from a plug anyway? Even if you house has a 15th/16th edition board it will have RCD protected socket ccts. You have no discrimination and its a waste of money IMO.


The point is, if the garage/shed circuit develops a fault
the RCD in the small CU shuts off the power locally
This means 'er indoors can watch Corrie without interruptions
if the OP decides to chew through the cable.
Fitting these boxes is standard practise in sheds, garages and caravans



Laughing good idea, but when you have a 30ma RCD in the shed and in the house It's anyone's guess which will trip first. Defeats the point.
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syl
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PostPosted: 19:32 - 23 Aug 2016    Post subject: Reply with quote

You should really get someone in to do it if you're not sure. Just google wiring up a CU. This diagram (with one MCB missing so you can see the bar - it shouldn't stick out like that [the ?]) gives you a bit of an idea. If you've got the bar in yours, you look pretty good (but messy as above).

https://i62.tinypic.com/k4jwwn.jpg
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DRZ4Hunned
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PostPosted: 20:00 - 23 Aug 2016    Post subject: Reply with quote

syl wrote:
You should really get someone in to do it if you're not sure. Just google wiring up a CU. This diagram (with one MCB missing so you can see the bar - it shouldn't stick out like that [the ?]) gives you a bit of an idea. If you've got the bar in yours, you look pretty good (but messy as above).

https://i62.tinypic.com/k4jwwn.jpg


Yeah I used that picture to wire mine, but it didn't work...

I'm getting sent a new RCD next week as mine appears to be faulty so I'll let you know if it fixes it or not Smile

I really hate paying for work to be done when I can do it myself, what's the worse that can happen, a fuse in a plug blow?
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lihp
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PostPosted: 20:07 - 23 Aug 2016    Post subject: Reply with quote

Your wiring by the way is disgusting and borderline dangerous.

No earth covering Also, you need to switch those MCB's around, the highest rated should be closest to the the main incoming RCD.

By the standard of that wiring, I'd recommend you get a spark in.
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DRZ4Hunned
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PostPosted: 20:51 - 23 Aug 2016    Post subject: Reply with quote

lihp wrote:
Your wiring by the way is disgusting and borderline dangerous.

No earth covering Also, you need to switch those MCB's around, the highest rated should be closest to the the main incoming RCD.

By the standard of that wiring, I'd recommend you get a spark in.


You obviously haven't read my previous posts Laughing

But thank you for your advice about the position of the MCBs, I'll swap them over. Thumbs Up
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RichardCraniu...
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PostPosted: 21:26 - 23 Aug 2016    Post subject: Reply with quote

DRZ4Hunned wrote:


You obviously haven't read my previous posts Laughing

But thank you for your advice about the position of the MCBs, I'll swap them over. Thumbs Up


I've seen much worse wiring by sparkies, don't worry
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