Unfinished Attics and Roof Spaces. Where wires are run on knobs or through tubes in a closed-in and inaccessible attic or roof space, the wiring is concealed knob-and-tube work; but if the attic or roof space is accessible, the wiring mustanbsp;...
|Title||:||McGraw Hill's National Electrical Code Handbook|
|Author||:||Joseph F. McPartland|
|Publisher||:||McGraw-Hill Companies - 2002|