On 7/30/13 12:31 PM, wrote:
"F.O.A.D." wrote:
My county uses "the National Electrical Code, as
amended, which sets standards for and provides for the inspection
of,
inspection procedures, permit requirements of the installation,
alteration, repair, servicing, and maintenance of electrical
wiring and equipment and interpretation of the Electrical Code."
What does your county use? The "brother in law knows wiring" code?
That in no way means that the inspectors adhere to said code.
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The equipment I was involved with building consisted of large,
stainless steel vacuum vessels with complex electrical controls, high
voltage power supplies and other process related electronics. The
technical proposals that we would submit were required to cite the
applicable codes to be used in it's design and construction,
especially for government projects. Problem is that in many cases
there were no codes that covered certain aspects of the system. For
example, the structural design of the chamber in terms of stresses,
etc., are not covered in the ASME codes which are designed for
pressure vessels, not vacuum. As a result, a 100 lb valve would be
mounted on a standard ASME flange with about 14, three quarter inch
bolts holding it on. Just a little overkill in terms of structural
strength and cost.
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.
I modified our code "cite" page to include the following statement:
"When the requirements of the system conflicts with any codes, the
system requirements shall apply".