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duty in the room where generators are operating.

Oily waste must be kept in approved metal cans, and removed daily. (See Definitions). 3. CONDUCTORS:

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

a. Must be in plain sight, and 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.

d. Must be kept rigidly so far apart that they cannot come in contact.

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

f. Must have ample carrying capacity, to prevent heating. (See Capacity of Wires Table.) 4. SWITCHBOARDS:

a. Must be so placed as to reduce to a minimum the danger of communicating fire to adjacent combustible material. (See Definitions).

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

c. Must be kept free from moisture.

d. Must be made of non-combustible material, or of hard wood in skeleton form, filled to prevent absorption of moisture.

e. Bus bars must be equipped in ac. cordance with Rule 3 for placing con. ductors. 5. RESISTANCE BOXES AND EQUALIZERS:

a. Must be equipped with metal, or other non-combustible frames. (See Definitions).


b. Must be placed on the switchboard, or, if not thereon, at a distance of a foot from combustible material, or separated therefrom by a non-inflammable, non-absorptive, insulating material. 6. LIGHTNING ARRESTERS:

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

b. Must be mounted on non-combustible bases in plain sight on the switchboard, or in an equally accessible place, away from combustible material.

c. Must be connected with at least two “ earths” by separate wires, not smaller than No. 6 B. & S., which must not be connected to any pipe within the building, and must be run as nearly as possible in a straight line from the arresters to the earth connection.

d. Must be so constructed as not to maintain an arc after the discharge has passed. 7. TESTING:—

a. All series and alternating circuits

must be tested every two hours while in operation, to discover any leakage to earth, abnormal in view of the potential and method of operation.

b. All multiple arc low potential systems (300 volts or less) must be provided with an indicating or detecting device, readily attachable, to afford easy means of testing where the station operates continuously.

c. Data obtained from all tests must be preserved for examination by insurance inspectors.

These rules on testing to be applied at such places as may be designated by the association having jurisdiction.


a. Must be wired under the same precautions as with a current of the same volume and potential for lighting. The motor and resistance box must be protected by a double pole cut-out and controlled by a double pole switch, except in cases where one-quarter horse-power or less is used on low tension circuit, a single pole switch will be accepted.

b. Must be thoroughly insulated, mounted on filled dry wood, be raised at least eight inches above the surrounding floor, be provided with pans to prevent oil from soaking into the floor, and must be kept clean.

c. Must be covered with a waterproof cover when not in use, and, if deemed necessary by the Inspector, be enclosed in an approved case. (See Definitions). 9. RESISTANCE BOXES:

a. Must be equipped with metal or other non-combustible frames. (See Defi. nitions).

b. Must be placed on the switchboard, or at a distance of a foot from combustible material, or separated therefrom by a non-inflammable, non-absorptive, insulating material.

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