CAP. 103]
[r. 13 cont.] Service lines.
Erection of line conductors at different voltages on same supports.
Inspection and maintenance of lines.
Materials used.
Factor of safety of line conductors.
Electricity Supply.
(8) Service lines shall be connected to line conductors at a point of support only and shall be fixed to insulators on consumers' premises. Every part of a service line (other than a neutral conductor connected with earth) which is accessible from a building with the use of a ladder or other special appliance shall be efficiently protected either by insulating material or by other means approved by the Director of Public Works.
(9) Where line conductors forming parts of systems at different voltages are erected on the same poles or supports adequate provision shall be made to guard against danger to linesmen and from the lower voltage system being charged above its normal voltage by leakage from or contact with the higher voltage system; and the type of construction shall be subject to the prior approval of the Director of Public Works.
(10) Every overhead line, including its supports and structural parts, and electrical appliances and devices belonging to or connected therewith, shall be regularly inspected and efficiently maintained.
(11) All materials used shall at the time of erection conform to the specifications for the time being in force of the British Engineering Standards Association and the Post Office (London) for the construction of aerial lines, so far as the same are applicable and are not inconsistent with this regulation.
PART II.—Specific.
(Applicable according to the voltage between line conductors where no part of the system is connected with earth, or according to the voltage to earth where part of the system is connected with earth.)
A.—For voltages not exceeding 650 volts direct current and 325 volts alternating current.
(12) The factor of safety of line conductors shall be 2. The factor of safety shall be based on the breaking load and shall be calculated on the assumption that the line conductors are at a temperature of 70° F. and that they are subjected to a wind pressure of 40 lb. per square foot:
184
CAP. 103]
[r. 13 cont.] Service lines.
Erection of line conductors
at different voltages
on same
supports.
Inspection and
maintenance of lines.
Materials used.
Factor of safety of line conductors.
Electricity Supply.
(8) Service lines shall be connected to line conductors at a point of support only and shall be fixed to insulators on consumers' premises. Every part of a service line (other than a neutral conductor connected with earth) which is accessible from a building with the use of a ladder or other special appliance shall be efficiently protected either by insulating material or by other means approved by the Director of Public Works.
(9) Where line conductors forming parts of systems at different voltages are erected on the same poles or sup- ports adequate provision shall be made to guard against danger to linesmen and from the lower voltage system being charged above its normal voltage by leakage from or contact with the higher voltage system; and the type of construc- tion shall be subject to the prior approval of the Director of Public Works.
(10) Every overhead line, including its supports and structural parts, and electrical appliances and devices belonging to or connected therewith, shall be regularly inspected and efficiently maintained.
(11) All materials used shall at the time of erection con- form to the specifications for the time being in force of the British Engineering Standards Association and the Post Office (London) for the construction of aerial lines, so far as the same are applicable and are not inconsistent with this regulation.
PART II.-Specific.
(Applicable according to the voltage between line conductors where no part of the system is connected with earth, or according to the voltage to earth where part of the system is connected with earth.)
A.-For voltages not exceeding 650 volts direct current and 325 volts alternating current.
(12) The factor of safety of line conductors shall be 2. The factor of safety shall be based on the breaking load and shall be calculated on the assumption that the line conductors are at a temperature of 70° F. and that they are subjected to a wind pressure of 40 lb. per square foot:
184
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