A mate is considering getting his daughter's consumer unit that is in the
integram garage moved lower down the wall as when a blown bulb trips it
she has to climb on something to re-set it.
I have suggested a proper thing to step onto and reset it. I have also
suggested fitting LEDs to avoid the regular GU10 failures.
However, it got me wondering - is there some sort of suitable enclosure for
connecting all the circuits to extended leads?
Would the CU need to be replaced to comply (if it is not metal)
I am trying to see if it is an easy (cheap) job or a nasty (expensive) job
for an Electrician.
That's neatly done, but the rings are terminated in the "extension" box
and connected to the RCBOs with a single wire that seems to be the same
size. It's probably something that I would do for such a short run, but
is it strictly allowed?
It's very neat, and filed away for future reference!
The only thing I would like to ask about (not a criticism) is: are the
bundled wires above 'allowed'? In terms of grouping, or whatever the
official term is?
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Bundled wires are certainly allowed (and in many cases unavoidable).
However they may result in the need to apply a de-rating factor to the
current carrying capacity of the cable. So long as when taken into
account the capacity is still adequate for the circuit there is no problem.
Note that the grouping factor applies to circuits and not number of
cables - so two ring circuits would count as two, not 4 (or more). The
exclusion of circuits with less than 30% of the grouped rating also
makes the situation noticeable better - since for example most lighting
circuits will be ignored.
You could also change the MCB to one which will handle a greater fault
current before tripping. Think they're called C type?
Since it's in a garage, I'd just used a suitable sized adaptable box. Most
wholesalers stock a range.
It depends on which direction the various cables come from. Whether they
just need shortening or extending.
A time consuming rather than difficult job. But you could just keep one of
those small ally ladders beside it?
*When blondes have more fun, do they know it?
Dave Plowman email@example.com London SW
The continuous load rating is similar, what changes is the delay before
operating - effectively the speed of response. C's are mainly used
where there is an inductive load which might be expected cause a trip
on start up.
On Sat, 18 Feb 2017 00:53:25 +0000, Dave Plowman (News) wrote:
GLS filament lamps typically have built in fuses to interrupt the
resulting arc current that's often instigated by a break in the filament.
This arc can keep growing as it consumes the remaining filament,
replacing the resistive filament wire, now shrinking in length, with a
negative impedance arc which rapidly increases the current until either
the built in fuse(s) or else the lighting circuit fuse/MCB blows/trips on
the consumer unit itself.
The 'Spot' types don't have enough space to incorporate such "anti-arc"
protection so are more prone to blow/trip a lighting circuit fuse/MCB at
the consumer unit.
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