EMT Voltage Permissions

Question: I have six four-inch runs inside the building supported overhead to feed two unit substations. Is it permissible to run these 13,800 volt circuits in EMT?

Answer: Yes, NEC Section 300.37 specifically permits EMT for this purpose. Underwriters Laboratories in the listing states: “EMT is suitable for enclosing circuits above and below 600 volts.”

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