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Installing the Wires

fig, moulding and method

INSTALLING THE WIRES There are a number of different methods that may be employed in installing the wires, the selection of the method used depending upon the requirements of the Inspection Department, the initial cost, and the general appearance. The simplest and least expensive method of wiring is to place them upon the surfaces of efiz Fig. 12.

Installing the Wires

Fig. 13.

Cleats or Knobs Used for Installing Conductors in Open Work.

walls and ceilings, they being held in place by means of porcelain cleats or knobs, as shown in Figs. 12 and 13. This method is not always per mitted by Inspection Departments; moreover, it is unsightly, and wires are exposed to me chanical injury, which is no small considera tion. Since the wires are all visible and ex posed, this is termed either open work or knob and cleat work.

A second method, which overcomes to a cer tain extent the objectionable features of the method just described, is to place the wires in a wooden or metal casing or moulding, which is fastened to the walls and ceiling, in plain sight. The wires in this case are more or less accessible for inspection at any time, and have good pro tection from mechanical injury. There are a

number of different types of casings in use. One of the least expensive, and still a very serv iceable one, is constructed of wood as shown in Fig. 14. This moulding is made in two parts— a backing and capping—so arranged as to thor Fig. 14. Wooden Casing or Moulding for Conductors.

Fig. 15. Types of Metal Cas ing or Moulding.

oughly encase the wire and afford suitable pro tection from abrasion. The backing is first screwed to the wall or ceiling; and after the wires are put in place, the capping is nailed on.

There are a number of different forms of metal mouldings on the market at the present time which are more compact than wooden ones and are growing in favor (see Fig. 15).

A means of protecting the wires that is much better than using moulding, is, first, to place them in a conduit, which is nothing more than a strong, smooth, water-tight tube having its inner