Fw: CBUS (Electrical) Experts please !

[Gareth Cook <g@xxxxxxxxxx>]

Ahem- yes, it's a Dual Pole Isolator -
http://www.thefusecompany.com/images/CHINT_DOUBLE_POLE%20_5KA_UL_APPROVED_MCB.jpg

I'll give you a buzz about this extractor Neil tomorrow.

G.

Gareth Cook
Tools and Process Architect
IBM SWG Sales - Lotus Park, Staines, TW18 3AG
Office: +44 (0)1784 445166 - Mobile: +44 (0)7980 445166
AIM Chat : TheBoyG - MSN Chat : chat@xxxxxxx
email: g@xxxxxxx


----- Forwarded by Gareth Cook/UK/IBM on 09/11/2005 20:57 -----

Discussion
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ukha_d@xxxxxxx
Today 20:42

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Re: [ukha_d] CBUS (Electrical) Experts please !
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Gareth

A couple of thoughts here

1) By "Twin MCB", do you mean a two pole MCB or two single pole
MCBs?

If the latter, you need to replace it with a two Pole MCB otherwise you
could end up with the neutral disconnected and the live side still
energised - Not very advisable!

However, this won't have any impact on your tripping problem.

2) Regarding the tripping problem, it sounds as if one or more of your
circuits has an earth or neutral fault.

You can either carry out a process of elimination by turning off
individual circuits until you isolate the faulty one(s) or test the
circuits using a megger.

Testing the circuits would probably be the quickest method although you
need to take care to disconnect electronic components from the circuits
before applying the test voltage (typ 1000V)

Drop me a line if you need to borrow my megger.

One other fault I have recently seen which may have some relevance was a
problem with the capacitor in an extractor fan.

The fan would trip the lighting circuit every time it switched off. It
turned out that the capacitor in the fan unit was faulty and, although
not down to earth, was causing the RCD to trip. Replacing the capacitor
cured the problem.

Cheers

Neil
Gareth Cook wrote:

>Anyone on this list able to have a quick chat to me regards feeding
CBUS
>from the CU ? I visited Nick Locke's place to see what Ben Addison had
>done - and was impressed enough to pretty much mirror and use the same
>MCB's etc.
>
>Trouble is, I didnt get any info on how the Consumer Unit feeds the
CBUS
>panels (or at least I dont remember!), and what I've put in place looks
>not to be the best solution. I've had a few issues, basically tripping
the
>RCD in the main CU. The outside lights have tripped and so do a couple
of

>my extractors in the bathrooms/en-suites (strangely only when turning
>off).
>
>So, I have 2 x Dimmers and 1 x Relay unit (need another relay soon tho,
>and yet another cabinet).
>My Hager CU has lights on the right (now disconnected), and mains on
the
>left. All mains on the left is through the panel's RCD.
>>From this mains side, is a 32Amp MCB, and I take the Live and
Neutral
from
>the CU to the first CBUS Panel, which goes into a Twin MCB (so I can
>isolate Live and Neutral totally).
>>From this , the neutrals and earth in those cabinets are all
commoned.
>The Live feed now goes to 3 MCB's, a 10Amp for each dimmer, and a 20Amp
>for the relay.
>Each Live Load from the dimmers and the relay goes though another MCB
>(mostly 1Amps units for example).
>
>Now, as Im getting this problem tripping back, mebe I should be doing
>something different here.
>
>Regards
>
>G.
>
> Gareth Cook
> Tools and Process Architect
> IBM SWG Sales - Lotus Park, Staines, TW18 3AG
> Office: +44 (0)1784 445166 - Mobile: +44 (0)7980 445166
> AIM Chat : TheBoyG - MSN Chat : chat@xxxxxxx
> email: g@xxxxxxx
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