From: Robert Baer
X-Mailer: Mozilla 4.75 [en] (Win98; U)
Subject: Re: Electrical Code??
Date: Tue, 10 Dec 2002 08:26:41 GMT
NNTP-Posting-Date: Tue, 10 Dec 2002 00:26:41 PST
Organization: EarthLink Inc. -- http://www.EarthLink.net
> We sell an electronic device that has historically been enclosed in a NEMA type
> enclosure. The device consists of an open frame linear 12 VDC power supply, a
> few circuit boards, and a modem.
> A new customer wants it mounted on a panel rather than having it enclosed. I
> sent him the first unit and he told me that it "didn't meet code". For
> example, he says that he THINKS that all exposed power supplies have to have a
> warning label near the power supply. No problem...I'll gladly add a warning
> My question is this. Is there a magical reference source for such requirements
> governing instrumentation electronics in the US? I always thought that 'code'
> were local requrements that varied from city to city.
> Any input is appreciated.
My aren't you lazy!
NEC is a standard US-wide code that is the *minimum* that all states,
then counties, then cities adhere to; whatever local codes or laws on
the local books either refer to or quote those regs, with whatever
additions the locals deemed appropiate.
Of course, there is no second-guessing insanity.
For example, that panel is mounted on a rack, the back of which is
closed (and maybe even locked).
Then, obviously to us sane idiots, the supply is *not* exposed - it is
behind the panel, and cannot be seen or touched (even by a 20 pound
sledge hammer at great velocity to the panel).
Also, since the rack surrounds (encloses) the rest of the circuitry,
the same arguement by us sane people applies.
But do *not* confuse me with the facts; i can *see* that damn supply
before it is installed and you must attach up to ten thousand MSDS
certificates (one for each possible chemical in the unit) as well as
those electrical warning signs and perhaps one warning of the fire
hazard of all of that damn paper.
I kid you not; if you were required to dot every eye and cross every
tee, that is exactly what would be required.