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Joined: Jun 2005
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gfretwell wrote:
Florida may be changing the plastic box situation. They have an emergency amendment to require bonding steel framing members... So, an investigation into the recent death was conclusive? Is there a link to the findings? Or is this a knee-jerk reaction...?
-George
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Joined: Jul 2004
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They are sure the steel framing was energized by a drywall screw strike and I hear this is the body they needed to require some kind of bonding in these steel studs.
They are using "EGC of circuit likely to energize" instead of 250.104(C) that refers to a 250.66 sized jumper.
That means a metal box or a plastic box with bonding strap will work.
[This message has been edited by gfretwell (edited 03-06-2006).]
Greg Fretwell
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Joined: Jun 2005
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So then, you're forced to have house panel loads bonded to the studs when they pass through a unit? How is this accomplished?
Not trying to be difficult, just curious how this is being executed.
-George
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Joined: Jul 2004
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Since most of these walls connect together in a matrix, you could accomplish effective bonding with a couple steel boxes. The only thing you really have to watch is small isolated sections of wall but 210.52 will usually require a receptacle in each of these small wall segments anyway.
In commercial, where metal enclosed wiring methods are SOP bonding steel framing has not really been an issue. It really came up in residential with all plastic plumbing and electric.
The exposure is in metal medicine cabinets and non-electrical enclosures that are screwed to the steel studs.
Greg Fretwell
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Joined: Jan 2005
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well lets get back on topic
I once wired a whole house w/ boxes that had a flange around the edge w/ a foam gasket attached to it. and they attached the vapor barrier to that gasket. the homeowner also put in a special fan to reclaim the air in the house[can't remember the right term]
that was 10 years ago went back last year the house was full of mold they were arlington boxes
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Joined: Nov 2002
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The "fan" is a heat recovery ventlator. It basically circulates the air inside to out, transferring heat from the outgoing air to the incoming air (and supposedly the other way in the other season), since the house is near perfectly sealed, and natural "leakage" does not exist.
I heard of gasketed boxes being used with foil backed drywall.
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