Fw: Which type of MCB to protect C-Bus dimmers

[Gareth Cook <g@xxxxxxxxxx>]

Interesting Phil...like to know what these MCB's are !

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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----- Forwarded by Gareth Cook/UK/IBM on 25/01/2006 21:41 -----

Discussion
Main Topic

ukha_d@xxxxxxx
Today 19:59

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Subject:
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RE: [ukha_d] Which type of MCB to protect C-Bus dimmers
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Category:




> -----Original Message-----
> From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx]=20
> On Behalf Of Nigel Giddings
> Sent: 25 January 2006 18:38
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Which type of MCB to protect C-Bus dimmers
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> One weakness of C-Bus dimmers, as I understand it, is that a=20
> bulb blowing can take out a Dimmer Channel.

Nope - it is a weakness of pretty much every triac based dimmer design=20
that
has been used in the residential market ... A bulb blowing can just as
easily take out an LD11 or an LW10U.=20

> I'm looking at protecting the O/P of the C-Bus dimmers with=20
> 1A MCBs but not sure what type (B, C or D) to use=20
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> What type of MCB would people suggest to protect C-Bus Dimmers?
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> Type B seem to offer most protection but their appears to be=20
> a school of thought that Type C should be used for lamps...=20
> If I were to use Type C would I still end up blowing the=20
> C-Bus Dimmers...
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> TIA=20
>=20
> Nigel

I was on-site with an integrator the other day (Monday) and was discussing
this with him ... What he does is fuse the output side of the dimmers at=20
1A
(or 2A for the 2A dimmers) using some rather nifty looking DIN rail=20
mounted
fuseholders that take normal sized mains fuses. He reckons that he's never
had a channel taken out since he's been doing that and the advantage is=20
that
they are 1/2 as wide as an MCB (so take up less space) and are *MUCH*
cheaper at about =A31 each apparently.

Phil



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