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tHIS ISOLATOR IS IT CONNECTED DIRECTLY IN THE MACHINE, OR IS THERE A SOCKET IN BETWEEN THEM?

Where and why is the tp & n isolator used?

I do not know. We use the british standarts due to the fact that uk owened us until 1960.

what kills? The voltage the current, does the frequency has anything to do with it?

Can i connect 4 f.s.u in a ring or radial circuit?

i saw in some installation designs 20A and 40 double pole swithes. what is their purpose?

Does any1 knows where can i find any reference to illumination calculation and any companies lamps specifications (preferably on the internet?)

What is the difference between a fused connector unit and fused spur unit?

This is for my diploma project. When adding a f.s.u on a ring circuit do i need to make any calculations or we just say it should be 2.5mm and thats it?