Questions and Answers Attachment 1 - MC Cable.pdf

UFC 3-520-01

October 6, 2015

Change 1, 20 Mar 2019

NFPA 70

Article Raceway/Cable Type Authorization

328 MV – Medium Voltage Cable

Authorized. For interior applications, MV cable must be installed in raceway or a fully enclosed cable tray.

Refer to UFC 3-550-01 for additional applications.

330 MC – Metal-Clad Cable Prohibited for feeder circuits other than feeder circuits for aerial messengers between buildings.

Prohibited for embedded or direct buried locations.

Prohibited for concealed locations, except as allowed below.

Allowed for branch circuits only in the following dry locations:

• New construction in exposed locations.

• Renovations in exposed locations.

• Concealed in renovations in existing areas where walls and ceilings are not disturbed.

• Cable trays.

332 MI – Mineral-Insulated, Metal-Sheathed Cable Authorized.

334 NM, NMC, NMS –

Nonmetallic-Sheathed Cable

Allowed only in one- and two-family dwellings and their attached or detached garages, and their storage buildings.

336 TC – Power and Control Tray Cable

Authorized.

338 SE, USE – Service- Entrance Cable

Authorized.

340 UF – Underground Feeder and Branch- Circuit Cable

Prohibited.

342 IMC – Intermediate Metal Conduit

Authorized.

344 RMC – Rigid Metal Conduit

Authorized. Only threaded-type fittings are allowed for wet and damp locations.