Figs. 870 to 872.—Metal moulding. An approved form consists, as shown, of two pieces: base ([fig. 870]), and cap ([fig. 871]), so formed as to snap together, the cap snapping over the base as in [fig. 872]. The entire moulding should be galvanized or coated with a rust preventive. When the base is held in place by screws or bolts from the inside surface, depressions must be provided so that the heads of the screws will be flush with the surface of the moulding.
Ans. Metal moulding, as shown in figs. 870 to 872.
Metal moulding is permitted on circuits requiring not more than 660 watts and where the pressure is not over 300 volts. Special fittings must be used with this class of moulding so that it is continuous both mechanically and electrically. The moulding should be grounded. The installation rules are practically the same as those governing conduit work.
Ques. What is a kick box?
Fig. 873.—"Kick box;" a device used to protect wires encased in porcelain tubes where they pass through floors.
Ans. A fitting, as shown in [fig. 873], for protecting wires at the points where they enter or emerge from the floor.
Ques. How is moulding work installed on brick or plaster walls which are liable to dampness?