Protecting peoples lives is not nonsense!
I am amazed at how many truly ignorant people are advising that some
variety of interlock is OK for a transfer switch. It is not only
illegal in both Canada and the US.
The emphasis is on Ignorant.
On Tue, 22 May 2007 22:26:45 -0500, "Solar Flaire"
No but we still get a lot of canadian quarters in our change.
The point is, does the CEC deal differently with separately derived
sources and things that are not SDS?
In the NEC, if you don't bond the neutral in the generator you don't
switch the neutral. The SDS does have the grounded neutral in the
separately derived source.
OK y'all got me now. What is SDS?
I don't necessarily agree with switching all conductors in all cases
and I think it is for the reason you have stated. I am not positive on
this one but I think there are no exceptions, bonded or not.
If the neutral is never bonded then a back feed can never
happen...hmmmmm. But then if a conductor isn't bonded then it requires
overcurrent protection, isolation and must be continuously ground
detected too.... they win.
On Wed, 23 May 2007 19:02:19 -0500, "Solar Flaire"
Separately Derived System. If that term is not familiar to you, code
is not your strong point.
That is another source of power that mimics a utility, in particular,
one with the ground and neutral that are bonded. You can also connect
a generator with ground and neutral that are not bonded. In that case
the bonding jumper in your service with accomplish the same thing and
you do not switch the neutral in your transfer equipment. In any case
you want one and only one bonding jumper in the system at any time.
This has to do with parallel grounding paths and has nothing to do
with backfeeding the grid. Your double pole double throw switching
device does that. and it can legally be accomplished with 2 breakers
that are mechanically interlocked. The code does not specify things
that are legal or illegal. The only requirement is that each path is
On Thu, 24 May 2007 18:46:26 -0500, "Solar Flaire"
No it is the deciding factor when you are deciding about switching the
neutral in transfer equipment. I am a US inspector but I do have
collegues in Canada and I bet if I ask them they will confirm that CEC
rules on SDS and neutral switching are basically the same.
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