Actually, the Wiring Regs do (BS7671) for all loads up to some power rating (3kW IIRC).
I presume this will change because the UK has been told it's not allowed to insist on _only_ 110V on construction sites. However, as a concession for having the lowest number of construction site electrocutions, we have been permitted to keep 110V supplies (EU originally wanted them completely removed).
If you say "since the voltage is halved" then you imply it is a function of voltage. If you are talking about voltage drop along the cable then you should have said "since the current is doubled". For a given cable R then the cable voltage drop is I^2*R so for a doubling of current the absolute voltage drop is quadrupled.
I was thinking only in terms of the voltage at the input to the device. If drop in the supply cable is of concern then I suggest the supply is inadequate.
I know.
But who says the 120V tool has the same winding resistance as a 240V tool? If it has then I don't think we are comparing like with like in terms of the power output of the tool.
Are these low electrocutions attributed to 110v or double insulation and RCDs, etc? And greater safety awareness which the Brits tend to have to say any Latin race.
Its similar to when they got all excited about audio equipment using 4mm banana plugs for speaker connections. The problem was that the banana plugs were just the right size for small children to stick into European power outlets. Of course, the fact that European power outlets don't contain any protective shutters over the holes when they are not in use was irrelevant.
No sorry, I was not being clear. By the "voltage is halved" I was talking about the 110V Vs. the 230V supply difference not the amount of voltage drop. Hence the implication that a given voltage drop counts double in percentage terms. e.g. if you get 2.3V drop on a 230V system that is a 1% drop, but on a 110V system would be a 2% drop.
Or the cable...
It almost certainly won't have the same winding resistance if it is designed to develop the same power output. It is the accumulated incidental losses that will add up to slightly more unwanted dissipation in the tool. However the figures here are probably negligible.
55V max WRT earth. I don't think RCD's are normally used (portable delicate safety critical devices which don't fail-safe on construction sites are not a good combination). Double insulation tends to be useless when someone hands you a power tool they just dropped into a puddle, or dropped off the scaffolding and the insides are all smashed up.
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