DNO Lucy box heaters

Question

I read on a Facebook group that deals with old plugs and other equipment that some Lucy boxes have small heaters built into them to keep the damp out and keep the mice warm. Is this a common arrangement? I'm just curiouse because it seems like the DNO would need to check these fairly often also surely the internal fuse gear would generate a fair bit of warmth especially on a winters nite. Ide be interested to know what our regular DNO engineers here think

broadgage · Accepted Answer

A lot of enclosures intended for electrical equipment incorporate a small heater more applicable to complex or expensive equipment that is vulnerable to damp. 
 This heater may be either thermostatic, or perhaps a PTC type that maintains a constant temperature. Not normally for boxes that house domestic cut outs and kwh meters.

broadgage · Answer

Here is a random example, self regulating PTC type, many others are available. https://undercontrol.co.uk/heating-elements/enclosure-heaters/mini-semiconductor-cabinet-heater/?attribute_wattage=13w&utm_term=&utm_source=google&utm_medium=cpc&gclid=Cj0KCQiA6rCgBhDVARIsAK1kGPKUjodIjtJ5JQRbtGlutznDhiefnWxek5JbqwTf6ggYlaF6WJBJy1AaAgMDEALw_wcB

DNO Lucy box heaters

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