Sec. 10-21. Rigid metal conduit, metallic tubing or armored
metal cable; surface metal raceways.
All installations of electrical wiring in buildings to be used
for industrial or commercial purposes, public use, and churches
shall be installed in rigid metal conduit or electrical metallic
tubing. All installations of electrical wiring in all other buildings,
including multiple family dwellings, shall be installed in
rigid metal conduit, electrical metallic tubing or may be wired
in armored cable or nonmetallic sheathed cable with grounding
conductor. Electrical wiring with voltage not exceeding
fifty volts between conductors may be installed in any building
without the use of conduit or tubing.
Where flexibility is required for connections, flexible metallic
conduits may be permitted in lengths not to exceed four feet.
The city electrician may authorize the use of surface metal
raceway for the extension of existing electrical wiring. (Code
1959, § 10-23; 2-6-61; 3-19-62; 5-6-68; 7-31-69.)
