Which wiring methods are approved for fixed wiring in an area above Class I locations in a major repair garage?

Which wiring methods are approved for fixed wiring in an area above Class I locations in a major repair garage?

• A. Type MI cable
• B. Type TC cable
• C. Type MC cable
• D. All of these

Answer: (D)

In a space that sits above a hazardous Class I location, the wiring method for fixed installations just needs to be listed for general, nonhazardous use. All three of these wiring methods—mineral-insulated cable, thermoplastic-sheathed cable with a metal armor, and metal-clad cable—are specifically listed for fixed wiring in normal areas. That means they’re all permitted options for wiring fixed installations in that area, so any of them can be used. The differences among them are mainly in construction and robustness, not in their eligibility for this nonhazardous space. Therefore, all of these are approved choices.

In a space that sits above a hazardous Class I location, the wiring method for fixed installations just needs to be listed for general, nonhazardous use. All three of these wiring methods—mineral-insulated cable, thermoplastic-sheathed cable with a metal armor, and metal-clad cable—are specifically listed for fixed wiring in normal areas. That means they’re all permitted options for wiring fixed installations in that area, so any of them can be used. The differences among them are mainly in construction and robustness, not in their eligibility for this nonhazardous space. Therefore, all of these are approved choices.