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Data Regarding Third Rail Clearances, and on Statement 2, pages 1 to 6, inclusive, Data Regarding Overhead Clearances. The recommendations of the Committee are given under the conclusions.

(8) Collaboration with Committee XVI–Economics of Railway

Location In Appendix G the Committee reports the result of its collaboration with Committee XVI on the economics of railway location as affected by the introduction of electric locomotives and its recommendations are given under the conclusions.

(9) Standardization In Appendix H the Committee submits Railroad Specifications for (a) Commercial Adhesive Tape for Electrical Purposes, and (b) Rubber Insulated Tape, for approval and printing in the Manual as recommended practice. These specifications are prepared with the view of standardizing materials and objects in accordance with the recommendation of the Committee on Standardization.

CONCLUSIONS 1. The Committee recommends that the report on Electrical Interference, being Appendix A, be accepted as information, published in the Proceedings and the subject continued.

2. The Committee recommends that the report on Water Power, being Appendix B, be accepted as information, published in the Proceedings and the subject continued.

3. The Committee recommends that the report on Electrolysis and Insulation, being Appendix C, be accepted as information and published in the Proceedings, that the subject be continued and the Committee authorized to continue its representation on the American Committee on Electrolysis and that the report of the American Committee on Electrolysis be accepted, printed in the Manual and in the Bulletin for convenient reference.

4. The Committee recommends that the report on the National Electrical Safety Code, being Appendix D, be accepted as information, published in the Proceedings and the Committee authorized to continue its conferences with the U. S. Bureau of Standards.

5. The Committee recommends that the progress report on Overhead Transmission Line Construction, being Appendix E, be accepted as information, published in the Proceedings and the subject continued.

6. The Committee recommends that the Third Rail and Overhead Clearance Tables, being Statements 1 and 2 of Appendix F, be accepted as information and published in the Proceedings.

7. The Committee recommends that the report on collaborating with the Committee on Economics of Railway Location, being Appendix G, be accepted as information and the coöperation continued.

8. The Committee recommends that (a) the Railroad Specifications for Commercial Adhesive Tape for Electrical Purposes, and (b) th Railroad Specifications for Rubber Insulated Tape, being Appendix H, be approved and printed in the Manual as recommended practice.

Recommendations for New Work The Committee recommends that in addition to continuing the present uncompleted assignments as enumerated, under the Conclusions, the following new subjects be added :

1. Review the Railroad Specifications for Electric Light, Power Supply and Trolley Lines Crossing Steam and Electric Railways (as printed in the Proceedings, Volume 21, page 208), with the view of bringing the specifications up to date and correcting any minor inaccuracies, in coöperation if possible, with the American Electric Railway Engineering Association, the American Telephone and Telegraph Company and the Western Union Telegraph Company.

2. Study and report on (a) Insulators, (b) Knife and Snap Switches, with the view of preparing plans and specifications for standardizing one or both of these objects, working in conjunction with appropriate committees of the Signal and Telegraph and Telephone Sections of the American Railway Association.

Respectfully submitted,

THE COMMITTEE ON ELECTRICITY,

Edwin B. KATTE, Chairman.

Appendix A

ITEM (2) ELECTRICAL INTERFERENCE

W. M. VANDERLUIS, Chairman;
J. C. DAVIDSON, Vice-Chairman;
R. BEEUWKES,

J. V. DUER,
S. WITHINGTON,

Sub-Committee.

The Committee was instructed to continue the study and report on electrical interference with telephone and telegraph lines caused by propulsion circuits, including recommendations for eliminating, as far as practicable, interference with signal and telephone and telegraph lines caused by propulsion circuits and adjacent transmission lines.

Previous reports to the A.R.E.A. on the subject of electrical interference may be found as noted below.

A.R.E.A. Proceedings, Vol. 20, 1919, pp. 203 and 204.
A.R.E.A. Proceedings, Vol. 21, 1920, pp. 272-274, inclusive.

A.R.E.A. Proceedings, Vol. 22, 1921, pp. 128-139, inclusive. On account of the confliction of interests involved in any attempt to mitigate electrical interference troubles, it seemed advisable to secure coöperation of the committee of the T. & T. Section of the A.R.A. handling the subject of inductive interference. Two meetings have so far been held with that committee.

There is attached a statement of the mitigating measures which may be employed, which statement has the tentative approval of Committee No. 7, T. & T. Section, and your Committee.

It will be noted that mitigating measures listed under the three heads "A," “B” and “C” are divided into three sections: First, measures which may be employed by the communication companies, including the railroad communication interests; second, measures which may be employed jointly by the communication interests, and the power and traction interests; third, measures which may be employed by the power and traction interests.

It is recognized that electrolysis should be classed under the heading of "Electrical Interference.” This matter has been handled completely by the American Committee on Electrolysis, whose final report is now in print, therefore under this heading reference is only made, for the convenience of the members, to that report, which will eventually appear in the Proceedings of the A.R.E.A.

These various measures have been assigned to members of two Committees, with a view to having worked up a text to cover simple statements of the troubles experienced, together with the method of handling these troubles. This work already is progressing satisfactorily.

Your Committee therefore submits, as a progress report only, the following statement, covering possible mitigating measures which may be employed, and suggests that the Committee be continued with a view to presenting later a discussion of the various items as included in the statement.

In listing mitigating measures, or measures used for other purposes which might mitigate interference, the Committee, at this time, makes no definite recommendations as to their practicability.

(“A”) Measures to minimize telephone and telegraph interference caused by alternating current propulsion distribution circuits.

SECTION I
1. Neutralizing transformers in telephone and telegraph circuits.
2. Shunts, filters and drainage coils in telephone and telegraph

circuits.
3. Balance of telephone circuits.
4. Transposition of metallic circuits.
5. Insulation of telephone and telegraph circuits.
6. Adjustment of operating current of telegraph circuits.
7. Cables for telephone and telegraph circuits.
8. Carrier circuits.
9. Metallic telegraph circuits.
10. Telephone and telegraph protectors.
11. Shielding conductors.

SECTION II
12. Relative position of telephone and telegraph circuits and propul-

sion circuits. 13. Avoidance of common ground connections for power and communication circuits.

SECTION III 14. Frequent transformer sub-stations feeding trolleys and feeders

with provision for sectionalization.
15. Avoidance of stub end feed.
16. Auto-transformers, distribution system as installed on the New

York, New Haven & Hartford Railroad.
17. Track booster transformers.
18. Feeder booster transformers.
19. Return feeders.
20. Current limiting reactors.
21. High speed circuit breakers and relays for power circuits.
22. Potential-neutralizing conductors.
23. Reduction of track leakage.
24. Track bonding.
25. Double trolley.

(“B”) Measures to minimize telephone and telegraph interference caused by direct current propulsion distribution circuits.

SECTION I

1. Balance of telephone circuits.
2. Transportation of metallic circuits.
3. Cables for telephone and telegraph circuits.
4. Carrier circuits.
5. Metallic telegraph circuits.
6. Ground potential regulator,
7. Insulation of telephone and telegraph circuits.
8. Telephone and telegraph protectors.

SECTION II 9. Relative position of telephone and telegraph circuits and pro

pulsion circuits. 10. Avoidance of common ground connections for power and con

munication circuits.

SECTION III
11. Elimination of tooth ripples in generators by

(a) Design of generators.
(b) Use of resonant shunts.
(c) Phase adjustment of two generators mechanically

coupled.
12. High speed circuit breakers with resistance.
13. Flash suppressors.
14. Frequent sub-stations.
15. Return feeders.
16. Track bonding.
17. Reduction of track leakage.
18. Double trolley.

("C") Measures to minimize telephone and telegraph interference caused by transmission circuits for A.C. and D.C. propulsion systems and for other supply lines.

SECTION I
1. Shunts, filters and drainage coils in telephone and telegraph

circuits.
2. Balance of telephone circuits.
3. Insulation of telephone and telegraph circuits.
4. Adjustment of operating current of telegraph circuits.
5. Cables for telephone and telegraph circuits.
6. Carrier circuits.
7. Metallic telegraph circuits.
8. Telephone and telegraph protectors.

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