light not exceeding 50 candle-power.

c. Must not be used except for pendants, wiring of fixtures, and portable lamps or motors.

d. Must not be used in show windows. e. Must be protected by insulating bushings where the cord enters the socket. The ends of the cord must be taped, to prevent fraying of the covering.

f. Must be so suspended that the entire weight of the socket and lamp will be borne by knots under the bushing in the socket, and above the point where the cord comes through the ceiling block or rosette, in order that the strain may be taken from the joints and binding

screws.

g. Must be equipped with keyless sockets as far as practicable, and be controlled by wall switches.

RULE 32. DECORATIVE SERIES LAMPS.

Incandescent lamps run in series circuits shall not be used for decorative purposes inside of buildings.

33. CONVERTERS:-

a. Must not be placed inside of any building, except the Central Station, unless by special permission of the Underwriters having jurisdiction.

b. Must not be placed in any but metallic or other non-combustible cases.

c. Must not be attached to the outside walls of buildings, unless separated therefrom by substantial insulating supports. IN THOSE CASES WHERE IT MAY NOT BE POSSIBLE TO EXCLUDE THE CONVERTERS AND PRIMARY WIRES ENTIRELY FROM BUILDING, THE FOLLOWING PRECAUTIONS

MUST BE STRICTLY OBSERVED:

THE

34. Converters must be located at a point as near as possible to that at which the primary wires enter the building, and must be placed in a room or vault constructed of, or lined with, fire-resisting material, and used only for the purpose. They must be effectually insulated from

the ground, and the room in which they are placed be practically air-tight, except that it shall be thoroughly ventilated to the out-door air, if possible, through a chimney or flue.

35. PRIMARY CONDUCTORS:

a. Must each be heavily insulated with a coating of moisture-proof material from the point of entrance to the transformer, and, in addition, must be so covered and protected that mechanical injury to them, or contact with them, shall be practically impossible.

b. Must each be furnished, if within a building, with a switch and a fusible cutout where the wires enter the building, or where they leave the main line, on the pole or in the conduit. These switches should be enclosed in secure and fireproof boxes, preferably outside the building.

c. Must be kept apart at least ten inches, and at the same distance from all other conducting bodies when inside a building.

36. SECONDARY CONDUCTORS:

Must be installed according to the rules for "Low Potential Systems."

37.

Class E.

ELECTRIC RAILWAYS.

All rules pertaining to arc-light wires and stations shall apply (so far as possible) to street railway power stations and their conductors in connection with them.

38. POWER STATIONS:

Must be equipped in each circuit as it leaves the station with an approved automatic" breaker," or other device that will immediately cut off the current in case the trolley wires become grounded. This device must be mounted on a fireproof base and in full view and reach of the attendant. (See Definitions).

39. TROLLEY WIRES:

•10

Must be no smaller than No. 0

B. & S. copper, or No. 4 B. & S. silicon bronze, and must readily stand the strain put upon them when in use.

b. Must be well insulated from their supports, and in case of the side or double pole construction, the supports shall also be insulated from the poles immediately outside of the trolley wire.

c. Must be capable of being disconnected at the power house, or of being divided into sections, so that in case of fire on the railway route the current may be shut off from the particular section, and not interfere with the work of the firemen. This rule also applies to feeders.

d. Must be safely protected against contact with all other conductors. 40. CAR WIRING:

Must be always run out of reach of the passengers, and must be insulated with a waterproof insulation.

41. LIGHTING AND POWER FROM RAILWAY WIRES:

Must not be permitted, under any pretense, in the same circuit with trolley wires with a ground return, nor shall the same dynamo be used for both purposes, except in street railway cars, electric car houses, and their power stations.