UK Where are the TN-S generators?

[Dazzler]

Hi all,


I've recently had 2 customers enquire about installing a backup generator for their domestic premises.

After a lot of research, contacting generator manufacturers, and generally going around in circles, it's become apparent that TN-S, or "centre tap earth" generators are practically non-existent in this country, honestly I cannot find one anywhere, and when you do contact manufacturers, all you get is a either very vague answer, or a straight "no, none of our generators are centre tapped to earth", together with the warning that any modifications will void the warranty.

I just can't understand the lack of this type of generator, when it's a requirement for supplying multiple class 1 equipment.

I'm finally at the end of my tether now, and about to reject both jobs due to the hassle involved in trying to design an installation that complies with BS7671, just because the unavailability of a product that makes this possible, or am I missing something here?

Anyway, enough ranting, now here's my question: Does anybody out there know of anywhere I can purchase a TN-S centre tapped to earth generator?


Thanks,


Daz.

 

[James]

I thought we'd established you don't want it centre tapped?

There won't be a PEN conductor, you still run seperate L N and E conductors.

If it was a 3 phase generator, it would be considered center tapped.
but a single phase, single voltage generator doesn’t have a center to tap!

it is a single winding where both ends are floating unless you tie one end down to earth.

 

[davesparks]

If it was a 3 phase generator, it would be considered center tapped.
but a single phase, single voltage generator doesn’t have a center to tap!

it is a single winding where both ends are floating unless you tie one end down to earth.

A 3 phase generator would be star point tapped rather than centre point tapped as it is not the centre point of a winding but the point where three windings connect together.

 

[James]

You are correct of course.
well spotted