Farmers with moulding machinery can make their own moulding.
The code prescribes it shall be of straight-grained wood; that the
raceways for the wires shall be separated by a tongue of wood one-half
inch wide; and that the backing shall be at least 3/8 inch thick. It
must be covered, inside and out, with at least two coats of
moisture-repellant paint. It can be had ready-made for about 2 cents a
foot.

_Special Heating Circuits_

If one plans using electricity for heavy-duty stoves, such as ranges
and radiators, it is necessary to install a separate heating circuit.
This is the best procedure in any event, even when the devices are all
small and suited to lamp circuits. The wire used can be determined by
referring to the table for carrying capacity, under the column headed
"rubber-covered." A stove or range drawing 40 amperes, would require a
No. 4 wire, in moulding. A good plan is to run the heating circuit
through the basement, attaching it to the rafters by means of
porcelain knobs. Branches can then be run up through the floor to
places where outlets are desired. Such a branch circuit should carry
fuses suitable to the allowed carrying capacity of the wire.

_Knob and Cleat Wiring_

Knob and cleat wiring, such as is used extensively for barns and
out-buildings, requires little explanation. The wires should not be
closer than 2-1/2 inches in open places, and a wider space is better.
The wires should be drawn taut, and supported by cleats or knobs at
least every four feet. In case of branch circuits, one wire must be
protected from the other it passes by means of a porcelain tube. It
should never be used in damp places, and should be kept clear of dust
and litter, and protected from abrasion.

[Illustration: Knob and cleat wiring]

Knob and tube wiring is frequently used in houses, being concealed
between walls or flooring. In this case, the separate wires are
stretched on adjoining beams or rafters, and porcelain tubes are used,
in passing through cross beams. For a ceiling or wall outlet, a
spliced branch is passed through the plaster by means of porcelain
tubes or flexible loom.

Wires from the house to the barn should be uniform with transmission
wires. At the point of entry to buildings they must be at least six
inches apart, and must take the form of the "drop loop" as shown in
the illustration. A double-pole entrance switch must be provided,
opening downward, with a double-pole fuse. In passing ove