RE: Re: Consumer Units

["Brian G. Reynolds" <brian.g.reynolds@xxxxxxx>]

Wow, nothing is easy when it comes to wiggly amps? no wonder I skipped
school when they were teaching it!

Thanks for the info,

B.


> -----Original Message-----
> From: James Hoye [mailto:james.hoye@xxxxxxx]
> Sent: 18 June 2001 09:58
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Re: Consumer Units
>
>
> This email was delivered to you by The Free Internet,
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> ---------------------------------------------------------------
> > I have an alley between my house and next door with the meters
fitted in
> > this area, what I was planning was having the house consumer unit
fitted
> > there then fit units for the AD10's at my node 0 in the top room
(loft
> > conversion) the distance between these points will be around 40
feet so
> > maybe too far as mentioned by Dr John.
>
> The few feet limit is the distance between the LEB meter and your
consumer
> unit.  You can increase this distance, but the LEB will probably
stipulate
> that you have to use >25mm tails, and a larger earth conductor
> (depending on
> your earthing system).  This is because their cutout (80 or 100A
> typically)
> is the only thing protecting the tails - and if a fault were to
develop
> between the cutout and consumer unit, there would be a fault current
in
> excess of probably 200A before their fuse went.  Under-rated
> tails would get
> very hot and would pose a significant fire risk.
>
> In regards to your specific question about siting a CU in node zero
for
> housing your X10 DIN modules, there should be absolutely no problem
with
> this.  You just need to run a suitably rated cable from an MCB way on
you
> main CU up to the one(s) in node zero.  The only proviso is that you
must
> use suitable cable - this means if you are running from a 6A MCB
> then 1.5mm
> will do, 16/20A use 2.5mm and for a 32A you will need 4mm.  The
purpose of
> the MCB is to _protect_ the cable by limiting the current in the event
of
> any fault.  One other point is that once you bring your cable up
> to the node
> zero CU, you _must_ use another suitably rated MCB (typically 6A for
> lighting) before you wire in 1.5mm for your X10 and lighting circuits.
>
> If you go _down_ in cable size, then you should use a fuse or MCB at
the
> 'join' to protect the smaller cable.
>
> If you are more interested, then I can recommend reading the IEE 16th
> Edition Wiring Regulations On Site Guide as it gives a good overview
of
> domestic electrics.  There are also tables for derating cables
> depending on
> their fixing method and what materials they pass through.  Remember,
safe
> not sorry.
> http://www.amazon.co.uk/exec/obidos/ASIN/0852969295/qid=970658173/
sr=1-1/026
-3724387-8058838

James H




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Automated Home UK
http://www.automatedhome.co.uk
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