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American electric Railway Engineering Association

34 pp. (English).
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 Summary

34c

Adopted 1914: Amended 1914; 1915; 1916 I"s 2c —-^

(Supersedes Ds 2a and Ds 2b)

SPECIFICATION FOR 600 VOLT DIRECT CURRENT OVERHEAD *- TROLLEY CONSTRUCTION.

nPOBEPKA

I — DEFINITIONS

CLASSES:

1. Overhead trolley construction will be classed as»» j j. uy, • : g»

(a) Direct suspension. |f ii Hii}

(b) Catenary suspension.

direct suspension:

2. Direct suspension comprises all forms of overhead trolley construction in which the trolley wires are attached, by suitable devices, directly to the main supporting system.

CATENARY SUSPENSION:

3. Catenary suspension comprises all forms of overhead trolley construction in which the trolley wires are attached, by suitable devices, to one (1) or more messenger cables which in turn are carried:

(a) In simple catenary, by main supporting system.

(b) In compound catenary, by secondary messengers which in

turn are carried by the main supporting system.

SUPPORTING SYSTEMS:

4. Supporting systems for direct or catenary suspension will be classed as:

(a) Simple span, comprising all those systems having at each

point of support a single flexible member attached at both sides of the track or tracks.

(b) Compound span, comprising all those systems having at

each point of support two (2) or more flexible members attached at both sides of the track or tracks, the upper member carrying part or all of the vertical load of the lower member.

(c) Bracket, comprising all those systems having at each point

of support an arm or similar rigid member attached at one side only of the track or tracks.

(d) Bridge, comprising all those systems having at each point

of support a rigid member attached at both sides of the track or tracks.

SUPPORTING STRUCTURES :

5. Supporting structures are the devices which sustain the support-No. S 12 (I9t6)


 
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