wrote in message ...
On 13 May,

SNIP


We hired a generator from a reputable firm to plug into a fixed socket to
supply fixed equipment via a changeover switch during a mains outage. The
generator was 230 volts and had it's centre tap earthed, giving 115-0-115
output relative to earth. On the fixed wiring was a fault, not showing
normally of an earthed neutral. This resulted in a lot of fried wiring.
Without the earth spike/bonding it could have been fried operator. It is
essential that for a temporary arrangement all safety checks are carried
out
*and* earthing arrangements verified.


The fact that the portable geny had an earthed centre tap would make it
extremely UNsuitable for use with an external earthed output leg. As you say
it is essential that whoever installs the system fully verifies it.
You could of course argue that having a maximum of 115 volts to earth shock
potential from the source would make it safer to use and a double pole 30mA
RCD on the geny output should detect (and isolate) any imbalance or leakage
to earth current.