Electricity Supply.
each of those wires shall be not less than one-tenth
of an inch in diameter.
(c) Where the mains are enclosed in a lead sheath the sheath shall be not less than one-tenth of an inch in thickness and shall be permanently and efficiently connected with earth.
(8) Extra high pressure mains for single phase supply and all cables connected therewith shall consist either of two concentric conductors or of separate conductors. Where concentric conductors are used the insulation shall be maintained efficiently throughout except that the outer conductor shall be connected with earth at one point, and where separate conductors are used provision shall be made as in the case of mains for three-phase supply to ensure that neither the ground nor any neighbouring electric line or conductor can become charged by leakage.
(9) An extra high pressure electric line shall not be brought into use for the supply of energy before it has been completely laid, properly jointed, examined and tested or until it is in the sole charge of the company, and every such line shall during its use be in the sole charge of the company.
(10) Extra high pressure mains shall not pass through the same street box with other mains, unless they are enclosed in strong metal casing; and street boxes containing high pressure mains shall not contain pipes for water, gas or other service, or electric mains belonging to another undertaking: Provided that any such street box may contain telephone wires belonging to the company.
(11) Sub-stations supplied at extra high pressure shall be established in suitable places and shall be in the sole occupation of the company.
(12) Sub-stations constructed below the surface of any street after 2nd December, 1921, to which an extra high pressure is to be given shall not contain switches or other apparatus than transformers.
(13) The transforming apparatus at any sub-station supplied at extra high pressure shall be so arranged that there shall be no danger of any mains connected therewith
195
[CAP. 103
Electricity Supply.
each of those wires shall be not less than one-tenth
of an inch in diameter.
(c) Where the mains are inclosed in a lead sheath the sheath shall be not less than one-tenth of an inch in thickness and shall be permanently and efficiently connected with earth.
(8) Extra high pressure mains for single phase supply and all cables connected therewith shall consist either of two Where concentric conductors or of separate conductors. concentric conductors are used the insulation shall be main- tained efficiently throughout except that the outer conductor shall be connected with earth at one point, and where separate conductors are used provision shall be made as in the case of mains for three-phase supply to ensure that neither the ground nor any neighbouring electric line or conductor can become charged by leakage.
(9) An extra high pressure electric line shall not be brought into use for the supply of energy before it has been completely laid, properly jointed, examined and tested or until it is in the sole charge of the company, and every such line shall during its use be in the sole charge of the company.
(10) Extra high pressure mains shall not pass through the same street box with other mains, unless they are in- closed in strong metal casing; and street boxes containing high pressure mains shall not contain pipes for water, gas or other service, or electric mains belonging to another undertaking: Provided that any such street box may con- tain telephone wires belonging to the company.
(11) Sub-stations supplied at extra high pressure shall be established in suitable places and shall be in the sole occupation of the company.
(12) Sub-stations constructed below the surface of any street after 2nd December, 1921, to which an extra high pressure is to be given shall not contain switches or other apparatus than transformers.
(13) The transforming apparatus at any sub-station supplied at extra high pressure shall be so arranged that there shall be no danger of any mains connected therewith
195
[CAP. 103
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