conduits. (See page 175, Rule 22, e.) RULE 23. DOUBLE POLE SAFETY CUT-OUTS:-

Section a. To be approved, boxes must be constructed, and cut-outs arranged, whether in a box or not, so as to obviate any danger of the melted fuse metal coming in contact with any substance which might be ignited thereby.

Section a. Insulating joints to be approved must be entirely made of material that will resist the action of illuminating gases, and will not give way or soften under the heat of an ordinary gas flame. They shall be so arranged that a deposit of moisture will not destroy the insulating effect, and shall have an insulating resistance of 250,000 ohms between the gas pipe attachments, and be sufficiently strong to resist the strain they will be liable to in attachment.

RULE 38. POWER STATIONS:

Section a. Automatic circuit-breakers should be submitted for approval before being used.

RULE 44. STORAGE OR PRIMARY BAT

TERIES:

Section b. Insulators for mounting secondary batteries to be approved must be non-combustible, such as glass, or thoroughly vitrified and glazed porcelain. RULE 45. WIRE PROTECTORS :

Protectors must have a non-combustible, insulating base, and the cover to be provided with a lock similar to the lock now placed on telephone apparatus or some equally secure fastening, and to be installed under the following requirements:-

1. The Protector to be located at the point where the wires enter the building, either immediately inside or outside of the same. If outside, the Protector to be inclosed in a metallic waterproof case.

2. If the Protector is placed inside of building, the wires of the circuit from the support outside to the binding posts of the Protector to be of such insulation as is approved for service wires of electric light and power, and the holes through

the outer wall to be protected by bushing the same as required for electric light and power service wires.

3. The wire from the point of entrance to the Protector to be run in accordance with rules for high potential wires; i. e., free of contact with building, and supported on non-combustible insulators.

4. The ground wire shall be insulated, not smaller than No. 16 B. & S. gauge. This ground wire shall be kept at least three (3) inches from all conductors, and shall never be secured by uninsulated double-pointed tacks.

5. The ground wire shall be attached to a water pipe if possible; otherwise may be attached to a gas pipe. The ground wire shall be carried to and attached to the pipe outside of the first joint or coupling inside the foundation walls, and the connection shall be made by soldering, if possible. In the absence of other good ground, the ground shall be made by means of a metallic plate or a bunch of

wires buried in a permanently moist earth. MATERIALS:

The following are given as a list of NON-COMBUSTIBLE, NON-ABSORPTIVE, INSULATING materials, and are listed here for the benefit of those who might consider hard rubber, fibre, wood, and the like as fulfilling the above requirements. Any other substance, which it is claimed should be accepted, must be forwarded for testing before being put on the market :1. Thoroughly vitrified and glazed Porcelain.

2. Glass.

3. Slate without metal veins.

4. Pure Sheet Mica.

5. Marble (filled).

6. Lava (certain kinds of).

7. Alberene Stone.

WIRES:

The following list of wires have been tested, and found to comply with the requirements for an approved insulation under Rule 10 (a), Rule 12 (d), and Rule 18 (a): Acme.

Ajax.

Americanite.

Bishop.

Canvasite.

Clark.

Columbia.

Crescent.

Crown.

Edison Machine.

Globe.

Grimshaw (white core).

Habirshaw (red core.)

Kerite.

National India Rubber Co. (N. I. R.).

Okonite.

Paranite.

Raven Core.

Safety Insulated {Requa white core

Safety black core

Salamander (rubber covered).

Simplex (caoutchouc).

U. S. (General Elec. Co.)

}

None of the above wires to be used unless protected with a substantial braided outer covering.