wrote in message ...

On Tue, 30 Jul 2013 13:53:21 -0400, "Eisboch"
wrote:

Same with many components used in the electrical design. The NEC
code
has absolutely nothing in it that addresses high voltage electron
beam
guns or power supplies.

They deal with that by requiring that installed equipment shall be
listed by a NRTL like U/L.. Then the inspector only checks to see that
it was installed according to manufacturer instructions.

The reality is after the building final , once you get inside the
warehouse and shut the door, you are on your own. It is between you,
OSHA and the fire marshal.

-----------------------------------------

We only had one instance where a city required that a system we built
be U/L certified or inspected. It was years ago and involved the old
Bell and Howell company who had a facility in Chicago, about a mile
from the airport. Our contract did not contain any U/L certification
requirements but the local electrical inspector sprang it on both Bell
and Howell and us after the system was built but before the city would
issue a permit for it's installation.

We ended up negotiating an acceptable inspection process with the U/L
guy (different inspector) that satisfied everyone. On our end, we
provided U/L certs for as many of the components we used that were
available from the manufacturer. Items that were unique to the
industry or entirely designed and made by my company were exempt,
although I had to explain to the inspector what they were and what
they did. He asked us to replace one simple and relatively
inexpensive solenoid valve with a similar type that a U/L cert was
readily available. The inspector told me it was basically for
paperwork purposes to prove he did his job.

I suspect that now-a-days the requirements are more stringent, plus
the unique industry I was in has further matured, so there probably
are now codes and either U/L or CE certs available for most
components.