Re: Fw: CBUS (Electrical) Experts please !

[Neil Fuller <neil@xxxxxxxxxxxxxxxxx>]

Just checking - I have seen people put in 2 x single pole MCB's :-o

Gareth Cook wrote:

>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
>Main Topic
>
>ukha_d@xxxxxxx
>Today 20:42
>
>.
>Subject:
>.
>Re: [ukha_d] CBUS (Electrical) Experts please !
>.
>Category:
>
>
>
>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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