What is EMT? - ECN Electrical Forums

Sorry about this string of silly questions,
but what is EMT? as a wiring system.
Is it like Mineral Insulated Metal Sheathed cable?.
Could someone please help?. [Linked Image]

TIA

The only truly silly question is one that goes unasked. [Linked Image]

EMT is short for Electrical Metallic Tubing
The NEC definition is......

Quote

An unthreaded thin-wall raceway of circular cross section designed for the physical protection and routing of conductors and cables and for use as an equipment grounding conductor when installed utilizing appropriate fittings.EMT is generallymade of steel (ferrous) with protective coatings or aluminum (nonferrous).

It is available in 1/2" through 4"trade size and available in 10 foot lengths.

Donnie

[This message has been edited by txsparky (edited 06-07-2003).]

Txsparky,
So EMT is a steel(metallic) conduit wiring system.
What sort of wire is normally pulled trough these conduits?.
Thanks for your advice Donnie!. [Linked Image]

thhn, thwn, etc etc....

Hey Sparky,
I don't wan't to sound dis-respective or anything, but I don't know what you mean with respect to thhn and twhn wires.
We don't use these sorts of wire designations over here in NZ. [Linked Image]

THHN Heat-resistant thermoplastic

THWN Moisture- and heat-resistant thermoplastic

Emt is used as a raceway, the same as Rigid and Intermediate conduit. The biggest differences are the EMT is to thin to be threaded and it is not as durable in corrosive areas. Emt is mainly used indoors, but is also used outdoors above grade.

Russ

http://www.alliedtube.com/html/mechdiv.html
http://www.wheatland.com/wtchp.htm

[This message has been edited by russ m (edited 06-07-2003).]

EMT

[This message has been edited by iwire (edited 06-07-2003).]