APPENDIX.

RULES AND REQUIREMENTS

OF THE

TIONAL BOARD OF FIRE UNDERWRITERS

e Installation of Wiring and Apparatus for Electric Light, eat and Power as Recommended by the Underwriters' tional Electric Association.

Edition of January 1, 1896.

GENERAL SUGGESTIONS.

ll electric work conductors, however well insulated, should be treated as bare, to the end that under no conditions, ; or likely to exist, can a grounding or short circuit occur, that all leakage from conductor to conductor, or between or and ground, may be reduced to the minimum.

11 wiring special attention must be paid to the mechanical on of the work. Careful and neat running, connecting, g, taping of conductors and securing and attaching of are specially conducive to security and efficiency, and strongly insisted on.

aying out an installation the work should, if possible, be from a center of distribution, and the switches and cutontrolling and connected with the several branches, be together in a safe and easily accessible place, where they eadily got at for attention or repairs. The load should be as evenly as possible among the branches and all compliid unnecessary wiring avoided.

use of wire-ways for rendering concealed wiring perma

most heartily endorsed and

nonded.

and this method of accessible concealed construction is advised for general use.

Architects are urged, when drawing plans and specifications, to make provision for the channeling and pocketing of buildings for electric light or power wires, and in specifications for electric gas lighting to require a two-wire circuit, whether the building is to be wired for electric lighting or not, so that no part of the gas fixtures or gas piping be allowed to be used for the gas-lighting circuit.

CLASS A, CENTRAL STATIONS.

FOR LIGHT OR POWER

(These rules also apply to dynamo rooms in isolated plants connected with or detached from buildings used for other purposes; also to all varieties of apparatus therein of both high and low potential).

a. Must be located in a dry place.

b. Must be insulated on floors or base frames, which must be kept filled to prevent absorption of moisture, and also kept clean and dry. Where frame insulation is impossible, the Inspector may, in writing, permit its omission, in which case the frame must be permanently and effectively grounded.

c. Must never be placed in a room where any hazardous process is carried on, nor in places where they would be exposed to inflammable gases or flyings of combustible material.

d. Must each be provided with a waterproof covering.

2. CARE AND ATTENDANCE:

A competent man must be kept on duty in the room where generators are operating.

Oily waste must be kept in approved metal cans and removed daily.

Approved waste cans shall be made of metal, with legs raising can three inches from the floor, and with self-closing covers.

From generators, switchboards, rheostats or other instruments, and thence to outside lines, conductors

a. Must be in plain sight or readily accessible.

b. Must be wholly on non-combustible insulators, such as glass or porcelain.

c. Must be separated from contact with floors, partitions or walls, through which they may pass, by non-combustible insulating tubes, such as glass or porcelain.

7. Must be kept rigidly so far apart that they cannot come in act.

e. Must be covered with non-inflammable insulating material cient to prevent accidental contact, except that "bus bars" be made of bare metal

Must have ample carrying capacity to prevent heating. (See -le of Capacity of Wires.)

. Must be so placed as to reduce to a minimum the danger of municating fire to adjacent combustible material.

Special attention is called to the fact that switchboards should not be built to the floor, nor up to the ceiling but a space of at least eighteen inches, or eet, should be left between the floor and the board, and between the ceiling he board, in order to prevent fire from communicating from the switchboard e floor or ceiling, and also to prevent the forming of a partially concealed every liable to be used for storage or rubbish and oily waste.

. Must be accessible from all sides when the connections are he back; or may be placed against a brick or stone wall when wiring is entirely on the face.

. Must be kept free from moisture.

7. Must be made of non-combustible material, or of hardwood keleton form, filled to prevent absorption of moisture.

. Bus bars must be equipped in accordance with Rule 3 for ing conductors.

ESISTANCE BOXES AND EQUALIZERS:—

. Must be equipped with metal, or other non-combustible

les.

he word "frame" in this section relates to the entire case and surroundings : rheostat, and not alone to the upholding supports.

. Must be placed on the switchboard, or, if not thereon, at a ince of a foot from combustible material, or separated thereby a non-inflammable, non-absorptive, insulating material. IGHTNING ARRESTERS:-

. Must be attached to each side of every overhead circuit ected with the station.

. Must be mounted on non-combustible bases in plain sight he switchboard, or in any equally accessible place, away from bustible material.

Must be connected with at least two 'earths" by separate llic strips or wires having a conductivity not less than that of .6 B. & S. wire. These strips or wires must be run as nearly

in a straight line from the arresters to the auth