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Hoping someone here can enlighten me - I'm trying to work out if this is at all correct, or just utter tosh. The context here is a model train set (powered by using a "wall wart" style plug to provide 12V to the rails for powering model trains.)

If you can touch any part of the circuit (such as the rails) then HSE & PAT rules say the system must be earthed. Those plugs have plastic earth pins. They are not earthed. It may only be low voltage but 'double-insulated' doesn't count where you can touch metal.
I'm having a hard time believing this is correct as pretty much all such power supplies (designed for powering model train sets, both new and old) seem to be double insulated with no earth pin. But I'm certainly no reg expert.
 
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telectrix

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it's tosh, IMO. and perhaps dangerous introducing earth potential to the train set ELV.
 

DPG

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I think you need to ask them to show you the exact part of the 'PAT' regulations that state this. I suspect they have misinterpreted them.
 

DPG

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Ask them to explain a double insulated (ie. Class I I) drill which has a metal chuck
 

Lucien Nunes

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Whoever came up with that nonsense is dangerously misinformed. Double-insulation specifically refers to insulation sufficient to render exposed metal parts safe to touch without earthing, as no single fault can render them live.
 
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Ok, thanks guys. You've pretty much confirmed my suspicions, nice to know I'm not a total pleb from time to time ;)
 

DPG

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Where did that information come from out of interest?
 
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  • #9
A Facebook thread on a model train group. (Any kind of electrical discussion on there is always painful, but sometimes I like to check I'm not going completely mad before calling BS.)

In fairness, and to complicate things further, the product that prompted the discussion is somewhat dubious IMHO (12v DC Split Power Supply Kit. (inc PCB and 2x Universal Wall Plugs) - https://www.dccconcepts.com/product/12v-dc-split-power-supply-kit-inc-pcb-and-2x-world-usable-wall-plug-power-supplies/) - but not for the reasons stated.
 

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