EMT Type Conduit for Med Voltage Feeders
EMT Type Conduit for Med Voltage Feeders
(OP)
Is EMT type coduit UL approved for use as a raceway means for med voltage (13.8 kV) feeders?
Joseph D. Legge, PE
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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EMT Type Conduit for Med Voltage Feeders
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RE: EMT Type Conduit for Med Voltage Feeders
Look like maybe it can. Sure wouldn’t want to ever rely on it for served-equipment grounding.
RE: EMT Type Conduit for Med Voltage Feeders
RE: EMT Type Conduit for Med Voltage Feeders
RE: EMT Type Conduit for Med Voltage Feeders
RE: EMT Type Conduit for Med Voltage Feeders
Section 36, High-Voltage Installations (>750 V)
36-100(2) Except as permitted in Paragraphs 1(b), 1(c), and 1(d), conductors used indoors or attached to buildings outdoors shall be:
(a) Installed in metal conduit; or
(b) Metal enclosed busways; or
(c) Cables having a continuous metal sheath, steel wire armour, or of the interlocking armour type; or
(d) Type TC tray cable installed in cable tray in accordance with Rule 12-2204.
As busbar says, EMT is tubing, not conduit.
RE: EMT Type Conduit for Med Voltage Feeders
"Conduit means a raceway of circular cross-section, other than electrical metallic tubing and electrical nonmetallic tubing, into which it is intended that conductors be drawn."
RE: EMT Type Conduit for Med Voltage Feeders
I had a chance to review the NEC on this item last night. What I found was:
NEC (1996) 710-4 Did NOT allow EMT to be used for this application.
NEC (1999) 300-37 Allows EMT to be used for this application.
It appears from 1996 to the 1999 code the writers had a change in heart about this issue.
Joseph D. Legge, PE