Gunner said:
Doug Miller wrote:
Rich. wrote:
a foot. With THHN, I can safely install nine #12s in one 1/2" EMT, for 4
_completely independent_ 20A circuits (4 phase conductors, 4 grounded
conductors, and one grounding conductor).
Actually, by code you can have 6 phase conductors, 3 neutrals, and use
the EMT as your ground, giving you 6 circuits instead of just 4.
I would like to know where you have 6 phase service?
He didn't say that. The context makes it very clear that by "phase conductors"
he means what the NEC refers to as "ungrounded conductors", or, in the
vernacular, "hot wires".
I won't go into the use of EMT as a ground source.
EMT is explicitly permitted by the NEC as an equipment grounding conductor.
[2008 National Electrical Code, Article 250.118(4)]
Yes, on the solid run, but not after any couplings, connectors etc..
A Greed Wire is to be inserted in the pipe to insure a real grounding
system and each box is to be connected to this ground.
You can not use EMT or the like for a grounding source directly, it
has to have a ground wire in it and the attached equipment in the
circuit also connects to this same ground.
As for the article you popped up, I think you'll find it proteins to
the use of EMT as a grounding buss point, meaning, several grounds can
come off this point using ground clamps from a single run with no
couplings how ever, a main ground source must be bonded to this pipe.
If you truly believe otherwise, then you are practicing very dangerous
habits.
Haven't you ever heard of galvanetic issues with EMT hardware?
I work in a manufactory facility where we still have a lot of older
machines using the access boxes as the ground sources for attached
equipment with no internal ground wire feed from the main buss. I can
say in the time that I have been there, we have seen several fires from
lose EMT hardware connections causing arcs because the attached
equipment was having ground issues.
With dust,oil and paint that has been apply to these machines, it
makes a nice catalysis for a fire.
Most of the time if your lucky, the lose connects will weld them
self's long enough to force the protection to initiate.
Then the various Licensed Electricians who installed machines etc over
the years at the factory I finished tearing down yesterday were all
doing it illegally. 75,000 sq ft and no grounds in any of the
boxes/runs.
California btw..Anaheim.
Jamie is a ham radio operator who claims to be an engineer. He is
about as bright as the 50+ sock puppet dimbulb troll.
his real name and address are:
Maynard A Philbrook, Jr
520 Pleasant St.
Willimantic Ct. 06226
He claims his company continues to use chemicals banned by the EPA,
that he reused outlets at higher than rated voltages where he works. He
pretends he is intelligent, but rarely makes a post without a dozen
spelling and punctuation errors, along with words that make no sense. A
lot like your friend Bill Sloman who cross posts here sometimes. The
old SOB who whines about everything American, and that they discriminate
against him in Europe, because he's old.
