Ques. How should feeders and mains be run?
Ans. It is advisable to install them in iron pipe even though the circuit wires be run otherwise. Since the former carry the main supply of current it is important to have them well protected as they usually run up side walls.
The underwriters make numerous restrictions against open or moulding work on brick walls and require good protection, and this is an additional reason for piping the mains and feeders.
Ques. How much load should be placed on the branch circuits?
Ans. In laying out the branch circuits, it is not good practice to use up the underwriters' circuit allowance of 660 watts.
Fig. 1,002.—View of outlet pocket showing base board, and cover supports in position.
If a circuit be wired with the full allowance of lamps, no additions could be made without violating the underwriter's requirements.
Ques. If concealed wiring is to be installed in a finished building what should be done first?