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Different. 12V dc is infinitely safer and less complex. But I agree on that it could lead to false complacency

and fire.

AC has added bonus of 3ph.

eg People were getting shocks off the showers at a camp.Only 50hz tingle sort. Couldnt figure out as water pipes were solidly earthed.

Even taking  a lead back to switchboard earth peg.

Only way we could fix it was balancing the loads on all 3ph's.

415V AC makes me notch up safety consciousness.

Only ever deal with if a sparky won't get out of bed.

 

So BP  is your boat steel/ferro?

That switch that is fried, was that to turn fields off manually?

Remember the old Pye TV sets? Lightly run your fingers on the rabbit ear antenna and there is a very slight tingle. Even though you are not earthed, the fact that it's LIVE,yes they had energised chassis, moving the fingers was enough to change the phase shift to create an exceptionally small voltage potential. It was the norm then to have phase as the common. Quite safe unless you connect yourself the the earth side of a 3 pin socket!

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Different. 12V dc is infinitely safer and less complex. But I agree on that it could lead to false complacency

and fire.

AC has added bonus of 3ph.

eg People were getting shocks off the showers at a camp.Only 50hz tingle sort. Couldnt figure out as water pipes were solidly earthed.

Even taking a lead back to switchboard earth peg.

Only way we could fix it was balancing the loads on all 3ph's.

415V AC makes me notch up safety consciousness.

Only ever deal with if a sparky won't get out of bed.

 

So BP is your boat steel/ferro?

That switch that is fried, was that to turn fields off manually?

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Did you get the sparky to check your main neutral connection? If he didnt, dont use him again and find someone else to have a look at it. It sounds like there is a dodgy neutral to me. Believe it or not, the main earth peg does bugger all in most installations.

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