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What is an electrical conduit?

Electrical conduit is an enclosed metal or nonmetallic channel that holds electrical wires or cables. Conduit is one type of raceway.

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By InstaBids editorial team with AI research agents. Updated

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Can steel raceways be installed as a watertight system?

No. Steel raceways can collect condensation even with sealed joints, according to the Steel Tube Institute’s conduit FAQ. “No raceway system is really “watertight”, including those that are glued or have sealed joints.” Source: Steel Tube Institute, read 2026-10-31. “Normally raceways will collect condensation.” Source: Steel Tube Institute, read 2026-10-31.

How does OSHA define an electrical conduit as a raceway?

Electrical conduit is a raceway: an enclosed metal or nonmetallic channel for electrical conductors. OSHA’s workplace definitions explicitly include rigid metal and rigid nonmetallic conduit among raceways. “An enclosed channel of metal or nonmetallic materials designed expressly for holding wires, cables, or busbars, with additional functions as permitted in this standard.” Source: Occupational Safety and Health Administration, read 2026-10-31. “Raceways include, but are not limited to, rigid metal conduit, rigid nonmetallic conduit, intermediate metal conduit, liquidtight flexible conduit, flexible metallic tubing, flexible metal conduit, electrical metallic tubing, electrical nonmetallic tubing, underfloor raceways, cellular concrete floor raceways, cellular metal floor raceways, surface raceways, wireways, and busways.” Source: Occupational Safety and Health Administration, read 2026-10-31.

Can steel conduit/tubing be used as equipment grounding conductors or do you have to use a supplementary conductor?

Yes. The Steel Tube Institute identifies RMC, IMC and EMT as equipment grounding conductors; its FAQ treats an additional wire conductor as a design consideration. OSHA’s federal workplace rule, 1910.305(a)(1)(i), requires effective bonding for metal raceways serving that purpose. “Yes, RMC, IMC and EMT are all permitted as equipment grounding conductors in accordance with NEC 250.118.” Source: Steel Tube Institute, read 2026-10-31. “It is permitted to add a supplementary wire type equipment grounding conductor sized in accordance with NEC 250.122.” Source: Steel Tube Institute, read 2026-10-31. “Metal raceways, cable trays, cable armor, cable sheath, enclosures, frames, fittings, and other metal noncurrent-carrying parts that are to serve as grounding conductors, with or without the use of supplementary equipment grounding conductors, shall be effectively bonded where necessary to ensure electrical continuity and the capacity to conduct safely any fault current likely to be imposed on them.” Source: Occupational Safety and Health Administration, read 2026-10-31.

What is the fire rating of steel conduit/EMT?

Steel conduit and tubing are noncombustible, but have no fire rating themselves, according to the Steel Tube Institute. “Steel conduit and tubing are considered noncombustible by the building codes.” Source: Steel Tube Institute, read 2026-10-31. “They do not have fire ratings.” Source: Steel Tube Institute, read 2026-10-31.

What is the coefficient of expansion for steel conduit/EMT and why is this significant?

The Steel Tube Institute gives steel conduit/EMT a coefficient of 6.5×10-6 in./in./°F, which affects the need for expansion fittings. “The coefficient of expansion for steel conduit/EMT is 6.5×10-6 in./in./°F.” Source: Steel Tube Institute, read 2026-10-31. “This is significant as it relates to whether or not expansion fittings would be required in a particular application.” Source: Steel Tube Institute, read 2026-10-31.

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