CO129-464 - Public Offices - 1920 — Page 115

actory este

2

111

(b)

(0)

(a)

3.

A steel tape from 40 to 45 mils thick to

be evenly laid on with a 2-inch right-hand

lay. In cables containing not more than

25 pairs of conductors this steel tape to

be 1-1/8 in. wide, and in larger cables 1-3/4

in. wide.

A second steel tape, similar to the first,

to be evenly laid on with a 2-inch right-hand

lay centrally over the gap left by the first.

Two servings of jute saturated with Stock-

holm tar and ozokerite composition to be laid

on in reverse lay. The first serving to

completely cover the steel tapes and the

second serving to completely cover the first..

All cables shall be tested during manufacture

at the Makers' Works and expense and shall comply with

the requirements of the above specification.

The lead sheath of the cable must be capable of

standing an internal pressure of 75 lbs. per square

inch and tests will be applied to selected lengths to

ascertain that this requirement is fulfilled. Pieces

of the lead sheath will be expanded to double ite

diameter to ascertain that it is of proper ductility

and purity. When thus expanded there must be complete

absence of cracks and flaws.

and

Each length of cable is to be submerged in water

for 24 hours, after the ends have been sealed. The

insulation resistance, the electrostatic capacity,

the continuity of all the conductors will then be

tested by the Engineers. Five per cent, of the con-

ductors will also be tested for ohmio resistance.

The

results must accord with the requirements set forth in

Clause 1.