readiescards Posted March 8, 2018 Share Posted March 8, 2018 Following on from: I need to hide a single pole 240vac switch in the chimney breast where temperatures around 50deg C have been recorded. Any suggestions on a suitable switch - or even a regular light witch in a surface box if anyone knows their temperature rating please? Link to comment Share on other sites More sharing options...
Nickfromwales Posted March 8, 2018 Share Posted March 8, 2018 Try RS or CPC. Needs a bit of digging. Link to comment Share on other sites More sharing options...
Onoff Posted March 8, 2018 Share Posted March 8, 2018 (edited) If you go for a "make" then MK is 40deg: https://www.mkelectric.com/Documents/English/EN MK Technical Specifications/T02 LOGIC PLUS Tech 355-389.pdf As in Click Mode: https://www.scolmore.com/_pdfs/spec_bros/Mode Switches.pdf I think you'll struggle for a standard white plastic jobbie. Something like a sauna rated switch? https://www.ebay.co.uk/itm/Surface-mounted-Sauna-Toggle-Switch-IP54-All-in-one-Frame-Insert-Cover-/122932662577?_trksid=p2385738.m4383.l4275.c10 Or intrinsically rated / hazardous area one, maybe this: http://www.cef.co.uk/catalogue/products/4574079-16a-2-pole-zone-1-light-switch Edited March 8, 2018 by Onoff 1 Link to comment Share on other sites More sharing options...
dpmiller Posted March 9, 2018 Share Posted March 9, 2018 As standard white accessories are made of thermoset material, I'm sure they're good way higher than 40c. What are you going to wire with anyway? Link to comment Share on other sites More sharing options...
Onoff Posted March 9, 2018 Share Posted March 9, 2018 Just now, dpmiller said: As standard white accessories are made of thermoset material, I'm sure they're good way higher than 40c. What are you going to wire with anyway? If you read the specs it says 40degC. That's manufacturer's instructions. It'd be a silly man goes against them in the event of an issue. 1 Link to comment Share on other sites More sharing options...
dpmiller Posted March 9, 2018 Share Posted March 9, 2018 True. It just seems... wrong. Link to comment Share on other sites More sharing options...
readiescards Posted March 9, 2018 Author Share Posted March 9, 2018 10 hours ago, Onoff said: I think you'll struggle for a standard white plastic jobbie. Something like a sauna rated switch? https://www.ebay.co.uk/itm/Surface-mounted-Sauna-Toggle-Switch-IP54-All-in-one-Frame-Insert-Cover-/122932662577?_trksid=p2385738.m4383.l4275.c10 Great, ordered. Ta Intend to wiring using, immersion flex which is good for 85 deg : https://www.ebay.co.uk/itm/IMMERSION-HEATER-FLEX-1-5MM-BUTRYL-RUBBER-CORD-BUTYL-3-CORE-STORAGE-HEATER-FLEX/172009242733?hash=item280c8cc06d:g:PpcAAOxy3JtRe-Se FYI I've only seen temps in 50deg range when I've been checking so immersion flex seems ok, unless any better suggestions Link to comment Share on other sites More sharing options...
Onoff Posted March 9, 2018 Share Posted March 9, 2018 1 hour ago, readiescards said: Great, ordered. Ta Intend to wiring using, immersion flex which is good for 85 deg : https://www.ebay.co.uk/itm/IMMERSION-HEATER-FLEX-1-5MM-BUTRYL-RUBBER-CORD-BUTYL-3-CORE-STORAGE-HEATER-FLEX/172009242733?hash=item280c8cc06d:g:PpcAAOxy3JtRe-Se FYI I've only seen temps in 50deg range when I've been checking so immersion flex seems ok, unless any better suggestions Low smoke T&E is good for I think 90deg. Ordinary for up to 70degC. At nom 50deg ambient you want to be applying a derating factor Ca to the cable don't forget. 0.71 for 70degC pvc. At 55degC it's 0.61. Obviously for 85deg rubber the derating factor is less. 1 Link to comment Share on other sites More sharing options...
Onoff Posted March 9, 2018 Share Posted March 9, 2018 Fair play if that sauna switch can handle 850degC! 1 Link to comment Share on other sites More sharing options...
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