EMT Fittings
- Thread starter jkim780
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hurk27
Senior Member
- Location
- Portage, Indiana NEC: 2008
Re: EMT Fittings
1. Stainless steel is used in high corrosive areas that a die cast would not hold up to. IE: acid baths salt storage. But cost allot more and wouldn't be cost effective to use on every job.
2. Two piece compression fittings allow us to install a piece of EMT between two boxes with out removing one. the other reason is the old school required them for concrete. even though a set screw fitting is listed for concrete.
But again the compression fitting will cost more.
So if you want to drive up the cost of a job just use SS compression fittings.
:roll:
Oh I forgot the last part of your question:
Eddited to add the last question
[ August 23, 2004, 08:03 PM: Message edited by: hurk27 ]
1. Stainless steel is used in high corrosive areas that a die cast would not hold up to. IE: acid baths salt storage. But cost allot more and wouldn't be cost effective to use on every job.
2. Two piece compression fittings allow us to install a piece of EMT between two boxes with out removing one. the other reason is the old school required them for concrete. even though a set screw fitting is listed for concrete.
But again the compression fitting will cost more.
So if you want to drive up the cost of a job just use SS compression fittings.
:roll: Oh I forgot the last part of your question:
As far as SS fittings yes 300.6 requires them and the FPN give's you an idea what kind of enviroments they will be required in.
Eddited to add the last question
[ August 23, 2004, 08:03 PM: Message edited by: hurk27 ]
hurk27
Senior Member
- Location
- Portage, Indiana NEC: 2008
Re: EMT Fittings
Paul:
Look at this:
Info on Raintight compression fittings from UL
Paul:
Not any more UL has pulled raintight listing from these connectors.
Look at this:
Info on Raintight compression fittings from UL
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Re: EMT Fittings
It can make a difference on the type of fitting. Setscrew is reported to be the best. There is a study done by the Univ of Georgia, its in the Soares Book on Grounding, they tested various types of fittings
It can make a difference on the type of fitting. Setscrew is reported to be the best. There is a study done by the Univ of Georgia, its in the Soares Book on Grounding, they tested various types of fittings
charlie tuna
Senior Member
- Location
- Florida
Re: EMT Fittings
780,
are you sure you mean stainless steel or actually "steel"? i recently witnessed an electrical fire where a phase to phase fault was surching it's way to find a ground potential. as i looked at the 2 1/2" emt raceway supported by minerallacs i noticed there were no fittings at the joints in the raceway??? pipe and elbows just dangling on the insulated feeder cables. then i looked on the floor and saw puddles of melted metal below each joint location. the fault current flowing through the raceway caused the fittings to melt! the end result was major system damage because the fault could not find a good path to ground to clear the fault! the selection of die cast or steel --- set screw or compression materials is determined by the job's specifications.
780,
are you sure you mean stainless steel or actually "steel"? i recently witnessed an electrical fire where a phase to phase fault was surching it's way to find a ground potential. as i looked at the 2 1/2" emt raceway supported by minerallacs i noticed there were no fittings at the joints in the raceway??? pipe and elbows just dangling on the insulated feeder cables. then i looked on the floor and saw puddles of melted metal below each joint location. the fault current flowing through the raceway caused the fittings to melt! the end result was major system damage because the fault could not find a good path to ground to clear the fault! the selection of die cast or steel --- set screw or compression materials is determined by the job's specifications.
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