other works of all descriptions, and in working the undertaking, so as not injuriously to affect, whether by induction or otherwise, the working of any wire or line used for the purpose of telegraphic, telephonic, or electric-signalling communication, or the currents of that wire or line, whether that wire or line is or is not in existence at the time of the laying-down or placing of the electric lines or other works.

At telegraph crossings the electric lines shall pass over or under the telegraph wires or cables, as may be decided by the Minister of Telegraphs, and shall be at least 2 ft. distant. Where it is impracticable to cross above or below, the electric lines may be taken through; but when permitted to be taken through, the crossing shall be made at a pole in a manner to be approved by the Minister of Telegraphs.

Where electric lines and telegraph lines intersect, the latter shall be suitably insulated if deemed necessary, and when the crossing is above and near a pole the spans of the latter on each side of the pole may be insulated. This insulation shall be effected at the expense of the said Council in cases where the telegraph lines existed previously to the erection of the electric lines.

Where overhead electric lines at extra high pressure cross telegraph lines, the electric lines shall be subject to special conditions as may be required by the Minister of Telegraphs in each case of such crossing.

Where deemed necessary, efficient guard-wires effectively earthed, or other approved protective devices, shall be erected, in a manner to meet with the approval of the Minister of Telegraphs, at all crossings or places where electric lines and telegraph lines intersect, or at any place where such protection may be considered necessary.

Such guard-wires shall be carried on substantial supports at a height of 2 ft. above the electric lines if the telegraph wires pass over the electric lines, or 2 ft. above the telegraph wires if they pass under the electric lines. In addition to the above precautions telegraph wires may be insulated if deemed necessary by the Minister of Telegraphs.

Where lead-covered telephone cables are crossed above or below by the electric lines, the latter lines shall be insulated with not less than 600-megohm-per-mile grade of vulcanized rubber throughout the crossing-span, and in every such span the maximum tension in the wire shall not exceed one-half the elastic limit of the wire under the conditions of minimum temperature and wind-pressure specified in clause 11.

In places where it may be required to cross the electric lines through any other aerial wires or cables because of the impracticability of crossing above or below—and crossing above or below shall be done if possible—all such through crossings, if permitted by the Minister, shall be effected at a pole. In every case of a through crossing, no matter whose property the lines crossed through may be, the method of carrying the electric lines across the pole, protecting them thereon, protecting other wires from coming into contact with them, and protecting persons working on the poles from danger of shock shall be to the satisfaction of the Minister. The electric lines shall be insulated with not less than 600-megohm-per-mile grade of vulcanized rubber where they pass through on the poles, and over the whole length of the span on each side of the pole crossed through. Where the insulated wires cross through on the pole they shall be encased in some approved hard protecting substance for the entire length of the arm on such pole. If metal pipe is used to encase the wire it shall be effectively earthed.

The cost of all necessary guard-wires and special provisions required to comply with this clause, or deemed to be necessary as a protection to telegraph or telephone lines generally, shall be borne by the said Council, when the telegraph lines are erected before the electric lines. In cases where the electric lines are erected before the telegraph line, the said Council, on receipt of notice from the local officer of the Telegraph Department that it is proposed to run a telegraph line along the route, shall forthwith make the necessary changes required to comply with this clause at any points at which electric lines already cross such routes, the cost of such charges being borne by the Post and Telegraph Department.

22. Lines not in Commission.

An aerial line shall not be permitted to remain erected after it has ceased to be used for the supply of energy unless the said Council intends within a reasonable time again to take it into use.

23. Lines crossing Metallic Substances.

When an aerial line crosses or is in proximity to any metallic substance, precautions shall be taken by the said Council against the possibility of the line coming into contact with the metallic substance by breakage or otherwise.

24. Railway Crossings.

No work of any nature shall be erected or constructed upon, over, or under any part of New Zealand Government railways

until the said Council has obtained the consent of the Minister of Railways thereto, as required by section 4 of the Government Railways Amendment Act, 1910 (No. 2).

Where overhead lines cross the railway the span between the supports shall not exceed 100 ft. in length where practicable. The poles on each side of the railway shall be embedded in concrete.

The lines over the railway, and for a span each side of the railway, shall be erected with a factor of safety on the basis that a maximum tension in the wire shall not exceed half the elastic limit of the wire under the conditions of minimum temperature and wind-pressure as specified in clause 11.

The minimum clearance above rail-level shall be 24 ft. for all lines working at low pressure, and 30 ft. for all lines working at extra high pressure. The dip or sag shall be calculated on the assumption of a maximum temperature of 122° F. The supports of the lines shall have a factor of safety of four (4) under the conditions of wind-pressure hereinbefore specified.

The conductors shall be hard-drawn stranded aluminium or copper cable.

For any pressure not exceeding 3,300 volts, the conductors shall be insulated with not less than 600-megohm-per-mile grade of vulcanized rubber, taped, braided, and compounded.

For extra high pressure the conductors shall be bare, and earthed bars shall be so fixed under each conductor that in the event of a conductor breaking, contact with the earthed bars shall be made before coming into contact with a passing train.

Telephone wires may be run with a minimum clearance above the rails of 24 ft., and shall be of hard-drawn copper of not less than No. 10 S.W.G. where they cross the railway and for a clear span on either side.

Guard-wires shall be erected by the Railway Department over the railway wires at the expense of the said Council wherever they may be deemed to be necessary.

25. Earth-wires.

Earth-wires, where led down poles, shall be protected by a casing for a distance of 8 ft. from the ground. A test shall be made every twelve months, or oftener if required, to ensure that the earth-wire is intact, and that the earth is effective.

26. Lightning-arresters.

Where any portion of any electric line, or support for an electric line, is exposed in such a position as to be liable to injury from lightning it shall be efficiently protected against such liability.

27. Transformers.

Transformers shall be placed either on poles or in substation. Where transformers are placed on poles they shall be fitted with watertight cases, and attached to the poles at such a height as to make them inaccessible except by means of a ladder or other special appliance. Where transformers are placed within substation, the substation shall be inaccessible except to authorized persons; all extra high-pressure conductors therein shall be thoroughly insulated or protected from accidental contact. A substantial insulating rubber mat or insulated wooden platform and rubber gloves shall be supplied. The cases of all transformers, whether within or without a substation, shall be connected to an efficient earth by a copper conductor in accordance with the rules of the Institution of Electrical Engineers of Great Britain for earthing.

Where cables are led to and from transformers placed on poles they shall be protected on the poles by being run in iron pipes, which shall be effectively earthed.

28. Motor Installations.

The frames of motors shall be connected to an efficient earth by a copper conductor, in accordance with the rules of the Institution of Electrical Engineers of Great Britain for earthing. All metal casings of switches, resistances, fuses, cables, and wires shall be efficiently earthed in a similar manner.

Every motor of 1½ horse-power or over must be controlled by an efficient quick-break iron-clad switch suitable to prevent arcing, and conveniently placed so that the person in charge of the motor can cut off wholly the supply from the motor and all devices in connection therewith.

Efficient fuses or other automatic cut-out must be provided to efficiently protect the conductors in each circuit from excess of current.

Every precaution shall be taken in choosing positions for and in wiring and setting-up of motors, and the necessary devices in connection therewith, so that there shall be no danger of fire being caused by their normal or abnormal action, or of shock being sustained, or in the ordinary handling thereof.