Depending on how the generator will be used, it may not require a connection
to a grounding electrode system. The NEC states that it you will have
cord-and-plug connected equipment through the receptacles mounted on the
gen, then it doesn't require grounding of the frame. Also if this is the
case, then ensure that the manufacturer has bonded (connected) the neutral
and ground within the generator, as it is a separately derived source.
If the previous is not the case, then you must connect it to a grounding
electrode system. If your are serving a premises with a grounding electrode
system, it must be the same, meaning connect directly to it, or drive a rod
and connect the rod to the existing grounding electrode system. It must be
one grounding system, not isolated.

There are lots of other things to consider like how you will transfer the
loads to the gen, and such, but go carefully.

"Ignoramus24153" wrote in message
...
I am aware that "all generators must be grounded". In the instance of
a standby portable generator like this

http://igor.chudov.com/tmp/onan/Diesel/

how would I ground it? I have two options:

1. Ground it to a new grounding rod (expensive and involves actual
work).

2. Ground it to the home grounding system, such as copper pipes in the
utility room, or even better next to the existing home ground
connection.

Which option here is more legal and more safe?

thanks

i