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crabtree flat plate 1gang 2 way switch innards - available?
Had a short on a light fitting. Tripped the mcb & rcd.
Repaired fault and went to switch light on, to discover switch now "always on" and not turnable off?!?! It now won't break elec. contact and won't latch in the "off" position, i.e.. it's no longer a switch.. Its a crabtree flat plate, screwless front 1gang 2 way light switch in brass. The "switch" is attached to the metal backplate with one screw and a location tab at the other end.. presumably some sort of grid switch? I've goggled various phrases to try and find something similar to try and just buy the "switch" bit as opposed to the whole bloody brass lightswitch at £10+. Anyone got any clues please on where to get just a spare "switch" not the whole shooting match? CHeers Jim K |
crabtree flat plate 1gang 2 way switch innards - available?
On Sun, 15 Dec 2013 14:20:02 -0800 (PST), Jim K
wrote: Had a short on a light fitting. Tripped the mcb & rcd. Repaired fault and went to switch light on, to discover switch now "always on" and not turnable off?!?! It now won't break elec. contact and won't latch in the "off" position, i.e. it's no longer a switch.. Its a crabtree flat plate, screwless front 1gang 2 way light switch in brass. The "switch" is attached to the metal backplate with one screw and a location tab at the other end.. presumably some sort of grid switch? I've goggled various phrases to try and find something similar to try and just buy the "switch" bit as opposed to the whole bloody brass lightswitch at £10+. Anyone got any clues please on where to get just a spare "switch" not the whole shooting match? CHeers Jim K Surely you can dismantle the switch and force the welded contacts apart? -- Dave W --- news://freenews.netfront.net/ - complaints: --- |
crabtree flat plate 1gang 2 way switch innards - available?
Dave W
No apparent way in! Moulded brown plastic with 3 terminals. How come contacts welded with a 30ma rcd installed & working? Jim K |
crabtree flat plate 1gang 2 way switch innards - available?
On 15/12/2013 23:59, Jim K wrote:
Dave W No apparent way in! Moulded brown plastic with 3 terminals. How come contacts welded with a 30ma rcd installed & working? I think the tripped MCB might be a clue. RCDs often trip simultaneously. |
crabtree flat plate 1gang 2 way switch innards - available?
On 15/12/2013 23:59, Jim K wrote:
Dave W No apparent way in! Moulded brown plastic with 3 terminals. How come contacts welded with a 30ma rcd installed & working? The fault was an overcurrent rather than an earth fault current. So the RCD trip was probably just in response to the transient and a reflection on the fact that its probably sensitised to the point of being close to tripping due to the leakage normally present in the circuit. So you would have had at least 30A through the switch briefly. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
crabtree flat plate 1gang 2 way switch innards - available?
"Jim K" wrote in message ... Dave W No apparent way in! Moulded brown plastic with 3 terminals. How come contacts welded with a 30ma rcd installed & working? Jim K The 30ma is the current to earth before it trips. It probably tripped as a result of a transient ie not a "real" fault to earth. The actual damage was due to the short circuit & could have been 60-100a for a few miliseconds. A lot depends on what part of the cycle is happening at the instant the fault occurs. |
crabtree flat plate 1gang 2 way switch innards - available?
On Sun, 15 Dec 2013 15:59:20 -0800 (PST), Jim K wrote:
No apparent way in! Even when the module is removed from the plate by taking out the screw and disengaging the tab? You may find that a cheaper plastic switch from the same maker has the same module on the back. -- Cheers Dave. |
crabtree flat plate 1gang 2 way switch innards - available?
"Jim K" wrote in message
... Dave W No apparent way in! Moulded brown plastic with 3 terminals. How come contacts welded with a 30ma rcd installed & working? Well 30mA is (roughly) the minimum that will trip a RCD, the RCD does not limit the current to 30mA in the event of a direct short. There was probably 6000A flowing when the RCD and MCB tripped. Anything in here to help you? http://www.electrium.co.uk/CrabtreeWADCP2010.pdf -- Adam |
crabtree flat plate 1gang 2 way switch innards - available?
On Monday, 16 December 2013 09:03:52 UTC, Dave Liquorice wrote:
On Sun, 15 Dec 2013 15:59:20 -0800 (PST), Jim K wrote: No apparent way in! Even when the module is removed from the plate by taking out the screw and disengaging the tab? nope. You may find that a cheaper plastic switch from the same maker has the same module on the back. yup will try that when I get some tuits. Cheers Jim K |
crabtree flat plate 1gang 2 way switch innards - available?
On Monday, 16 December 2013 18:45:11 UTC, wrote:
"Jim K" wrote in message ... Dave W No apparent way in! Moulded brown plastic with 3 terminals. How come contacts welded with a 30ma rcd installed & working? Well 30mA is (roughly) the minimum that will trip a RCD, the RCD does not limit the current to 30mA in the event of a direct short. There was probably 6000A flowing when the RCD and MCB tripped. Anything in here to help you? http://www.electrium.co.uk/CrabtreeWADCP2010.pdf -- Adam mmm lots of minutely different variations of Platinum Flat plate yokes and switches.... none of which appear to be what I have here :( Cheers Jim K |
crabtree flat plate 1gang 2 way switch innards - available?
"Jim K" wrote in message
... On Monday, 16 December 2013 18:45:11 UTC, wrote: "Jim K" wrote in message ... Dave W No apparent way in! Moulded brown plastic with 3 terminals. How come contacts welded with a 30ma rcd installed & working? Well 30mA is (roughly) the minimum that will trip a RCD, the RCD does not limit the current to 30mA in the event of a direct short. There was probably 6000A flowing when the RCD and MCB tripped. Anything in here to help you? http://www.electrium.co.uk/CrabtreeWADCP2010.pdf -- Adam mmm lots of minutely different variations of Platinum Flat plate yokes and switches.... none of which appear to be what I have here :( No number on the one you have? -- Adam |
crabtree flat plate 1gang 2 way switch innards - available?
No number on the one you have?
--Adam Placcy switch :- BS EN 60669 1M 10AX 250V Yoke :- SERIES 7000 XV21434 102 CRABTREE ENGLAND Tia Jim K |
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