March 8, 20188 yr 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?
March 8, 20188 yr 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, 20188 yr by Onoff
March 9, 20188 yr 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?
March 9, 20188 yr 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.
March 9, 20188 yr Author 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
March 9, 20188 yr 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.
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