Mobile Generator Earthing

[victorgrant]

Hi,

I've operated mobile generators for a few years and always presumed to earth for safety and reference. I understand the text and content of the above noted BS 7909 but not the reason. Was recently in a field ie an independent environment, with 3 day light simulating lights each consuming 18 kw and spread across 3 phases.
I wasn't responsible for the gen set on this occasion though we'd problems with the ballasts 'till I earthed the system.
Any comments please on the reason for no earth being required on occasions?

Please help.

I didn't find the right solution from the Internet.

References
www.theiet.org/forums/forum/messageview.cfm?catid=205&threadid=63229
Medical Device Marketing Examples

Thanks