Odd Electrical Connection
Odd Electrical Connection
(OP)
I have to hookup a scientific glove box that will be operated with a slightly pressurized nitrogen atmoshpere. The equipment came with an odd electrical penetration consisting of three, bare copper rods that pass through from outside to inside. It is a 208 volt, 1 phase, 90 amp service requirement. Has anyone dealt with trying to make an NEC code compliant electrical installation with anything similar to this.






RE: Odd Electrical Connection
Is this a UL or NRTL listed equipement? A standard product with published specs by the mfr or a contraption put together by "scientists" in the lab? If this is not a standard product of a manufacturer, all bets are off.
Are those rods part of electrical circuit? What does this box supposed to do??
The electrical requirement descibed suggests nothing out of ordinary, but your question is not clear as to what part of Code you are worried about.
RE: Odd Electrical Connection
The question is how to connect the bare copper rod(about 1/4" diameter, one per phase) to a standard terminal block so the electricians can terminate the power feeder wire. I was unable to locate any kind of compression type device that would be suitable for sliding over the bare copper conductor.
As an alternate, I tried to not use the provided "electrical" penetration and put a conduit sleeve through the wall and tried to seal it with Duct Seal, but the pressure is escaping so I may have to go back to using the original gas-tight device(the copper rods). I may also try an EYS seal fitting with an expansion Chico compound to get the seal I need around the conductors. If that doesn't work, I"ll have to figure out how to somehow connect the copper rods.
RE: Odd Electrical Connection
Conversely, if they are solid rods, a connection could be made by threading, or drilling and tapping, the rod, depending on it's diameter. I might use a heat-shrink insulation to cover the rest of the rod surface.
RE: Odd Electrical Connection
RE: Odd Electrical Connection
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RE: Odd Electrical Connection
You seem to know very little about what this equipment is yet you figurred that those rods need to be connected one per phase?? How did you reach this conclusion?
There must be terminals provided outside the oven for electrical connection. I do not get as to why you have to penetrate wall, etc.
Ask the manufacturer! At least post a picture of the oven and things you are talking about. Did this unit come with installation instruction?
If not ask the entity who provided it.
RE: Odd Electrical Connection
Ed
RE: Odd Electrical Connection
http://po
Bill
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"Why not the best?"
Jimmy Carter
RE: Odd Electrical Connection
I attached a photo of the copper bar penetration.
RE: Odd Electrical Connection
RE: Odd Electrical Connection
This obviously is not a standard product, but a cotraption put together by someone. Nor do they look like electrical connection points.
I would stay away from this!
RE: Odd Electrical Connection
There are scads of sealing feed-thru s for cables available. I would just get an OffTheSelf unit that works with your oven cable.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Odd Electrical Connection
The glovebox manufacturer is the one to ask.