DNO Lucy box heaters

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

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  • The older type of enclosure or box heater was indeed a simple resistor. Newer products tend to use a PTC heater these maintain a constant temperature at any voltage within reason, indeed the same unit can often be used on both 110 volt circuits and on 240 volts. The wattage used and the temperature reached will be the same on either voltage.

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  • The older type of enclosure or box heater was indeed a simple resistor. Newer products tend to use a PTC heater these maintain a constant temperature at any voltage within reason, indeed the same unit can often be used on both 110 volt circuits and on 240 volts. The wattage used and the temperature reached will be the same on either voltage.

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