On 6/8/06, Brent Brown <brent.brown@clear.net.nz> wrote:

> I am wondering about general requirements such as isolation and
> earthing, fusing, wire colours, labelling, if the relay should be one
> pole or two, testing for compliance, etc. My searches so far have
> led me to the National Electrical Code (NEC) and the
> NEC handbook:-
>

If you want to get your product certified, you will have to work with
a UL engineer. You may want to get a consultant to make things
easier.

UL508 is the general standard covering industrial control equipment.
UL840 and UL1097 (for double insulation) might be useful to address
the isolation requirement.

Regards,
Xiaofan
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