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Topic Title: Neon Indicator and Operation of 32 Amp. M.C.B.
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Created On: 21 September 2017 09:41 AM
Status: Read Only
Linear : Threading : Single : Branch
 Neon Indicator and Operation of 32 Amp. M.C.B.   - Zoomup - 21 September 2017 09:41 AM  
 Neon Indicator and Operation of 32 Amp. M.C.B.   - broadgage - 21 September 2017 10:06 AM  
 Neon Indicator and Operation of 32 Amp. M.C.B.   - mapj1 - 21 September 2017 01:18 PM  
 Neon Indicator and Operation of 32 Amp. M.C.B.   - Zoomup - 22 September 2017 08:09 AM  
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 21 September 2017 09:41 AM
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Zoomup

Posts: 3284
Joined: 20 February 2014

Mornin All,
yesterday an old boy called me out as he said that in the night he had operated the 20Amp. D.P. switch that controls his immersion heater. There is no time switch. He was trying to get the cheaper night time heating of his water I imagine. He said that there was a flash of light from the switch and then he lost power. The immersion heater has a switch with a neon indicator. The supply for the immersion heater is taken off the ring final and is protected by a B32 M.C.B.

The M.C.B. had operated, he then reset it.

I tested the immersion heater as being o.k. The system is TT earthed with a 30 m.A. R.C.D. I changed the rod stat for a new safety type with the over temperature limit switch.

Could a burnt out series resistor to a neon indicator cause an 32 Amp M.C.B. to trip off? It was sleeved but the sleeving was heat damaged and blackened.

Bye,

Z.
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