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Where and why is the tp & n isolator used?

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?