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No. 10 of 1902.
33
No. 10 of 1902.
TRAMWAY.
(i) that the current passing from the earth connexious through the indicator to the generator shall not at any time exceed either two amperes per mile of single tramway line, or five per cent, of the total current out- put of the station.
(ii) that if at any time and at any place a test be made by connecting a galvanometer or other current-indicator to the uninsulated return to any pipe in the vicinity, it shall always be possible to reverse the direction of any current indicated by interposing a battery of three Leclanche cells connected in series if the direction of the current is from the return to the pipe, or by interposing one Leclanche cell if the direction of the current is from the pipe to the return.
In order to provide a continuous indication that the condition (i) is complied with, the company shall place in a conspicuous position a suitable properly connected and correctly marked current-indicator, and shall keep it connected during the whole time that the line is charged.
The owner of any such pipe may require the company to permit him at reasonable times and intervals to ascertain by test that the conditions specified in (ii) are complied with as regards his pipe.
7. When the return is partly or entirely uninsulated a continuous record shall be kept by the company of the difference of potential during the working of the tramway between the points of the uninsulated return furthest from and nearest to the generating station. If at any time such difference of potential exceeds the limit of seven volts, the company shall take immediate steps to reduce it below that limit.
8. Every electrical connexion with any pipe shall be so arranged as to admit of easy examination, and shall be tested by the company at least once in every three months.
9. Every line and every insulated return or part of a returu except any feeder shall be constructed in sections not exceeding one-half of a mile in length, and means shall be provided for insulating each such section for purposes of testing.
10. The insulation of the line and of the return when insulated, and of all feeders and other conductors, shall be so maintained that the leakage current shall not exceed one-hundredth of an ampere per mile of tramway. The leakage current shall be ascertained daily before or after the hours of ruming when the line is fully charged. If at any time it should be found that the leakage current exceeds one-half of an ampere per mile of tramway, the leak shall be localised and removed as soon as practicable and the running of the cars shall be stopped unless the leak is localised and removed within twenty-four hours: Provided that where both line and returu are placed within a conduit this regulation shall not apply.
11. The insulation resistance of all continuously insulated cables used for lines, for insulated returns, for feeders, or for other purposes, and laid below the surface of the ground, shall not be permitted to fall below the equivalent of ten megohms for a length of one mile. A test of the insula- tion resistance of all such cables shall be made at least once in each month.
12. Where in any case in any part of the tramway the line is erected overhead and the return is laid on or under the ground, and where any wires have been erected or laid before the construction of the tramway in
TRAMWAY.
the same or nearly the same direction as such part of the tramway, the company shall, if required so to do by the owners of such wires or any of them, permit such owners to insert and maintain in the company's line one or more induction-coils or other apparatus approved by the company for the purpose of preventing disturbance by electric induction. In any case in which the company withholds its approval of any such apparatus the owners may appeal to the Governor in Council, who may, if he thinks fit, dispense with such approval.
13. Any insulated return shall be placed parallel to and at a distance not exceeding three feet from the line when the line and return are both crected overhead, or eighteen inches when they are both laid underground. 14. In the disposition, connexions, and working of feeders the company shall take all reasonable precautions to avoid injurious interference with any existing wires,
15. The company shall so construct and maintain their system as to seenre good contact between the motors and the line and return respectively.
16. The company shall adopt the best menus available to prevent the occurrence of undue sparking at the rubbing or rolling contacts in any place and in the construction and use of their generator and motors.
17. In working the cars the current shall be varied as required by means of a rheostat containing at least twenty sections or by some other equally efficient method of gradually varying resistance.
18. The company shall, so far as may be applicable to their system of working, keep records as specified below. These records shall, if and when required, be forwarded for the information of the Governor in Commeil.
Daily records.
Number of cars running. Maximum working current.
Maximum working pressure.
Maximum current from the earth connexions (vide rulo 6 (i)). Leakage current (cide rule 10).
Fall of potential in return (vide rule 7),
Monthly records.
Condition of earth connexions (vide rule 5). Insulation resistance of insulated cables (ride rule 11).
Quarterly records,
Conductance of joints to pipes (ride rule 8).
Occasional records.
Any test made under the provisions of rule 6 (ii).
Localisation and removal of leakage, stating time occupied.
Particulars of any abnormal occurrence affecting the electric working of the tramway.
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