BATTERY-UNITS

For supplying power for day loads not exceeding 4Ah. at 22V.

Used with Rectifier No. 33B on A.C. mains or with exchange power-lead (30V min).

Introduced in 1948.

There are Mark 1 and Mark 2 models.  The Mark 1 had a fuse and lamp test circuit keys, for current tests, which are omitted on the Mark 2.

Dimensions - 8.25" x 10.25" x 20.25".

Includes:-

2 x Brackets, Mounting, BH.
1 x Block, Terminal, No. 21 /2.
1 x Block, Terminal No. 21 /12.
2 x Fuse-mountings, No. 101A.
1 x Rectifier-element No. 4/6AA.
1 x Relay No. 500A or 5001.
1 x Relay Cover AK.

To he requisitioned separately:-
1 x Rectifier No. 33B.
2 x Fuses No. 1/1.5.
9 x Connectors Secondary, Cell No. 10.
10 x Cells, Secondary, Portable No. 10.
2 x Fuses No. 1/015.

Drawing - 63750 (Mark 1).

Diagrams - N634/0 (Mark 1) and N634/1 (Mark 2).

Description - EI Power, General S1211.
Installation - EI Power, General S3211.
Annual charges - EI Power, General S0901.

This unit was superseded by the Battery-Unit No. 1A.

Battery-Unit N634 Mark 1 - With cover removed
 

Battery-Unit No. 1A
A grey painted wooden box that housed up to 12 cells.

For supplying power for day loads not exceeding 4Ah at 22V.

Used with Rectifier No. 93A on A.C. mains.

Includes:-
2 x Fuses No. 36/1 and clips for mounting Hydrometer 18A.
13 x Connectors, Secondary, Cell No. 10.

To be requisitioned separately:-
12 x Cells, Secondary, No. 10.
1 x Hydrometer No. 18A.
Cord, flexible, 250V., PVC. 0-0006 sq. in.
When used with Rectifier No. 93A.

This item supersedes Battery-unit N634 with Rectifier No. 33B.

Drawing - 91631.

Diagram - N658.

Description - EI Power, General S1212.
Annual charges - EI Power, General S0901.
 

Battery-Unit No. 2A
A grey painted wooden box that housed up to 24 cells.

Used in subscribers' premises for providing 50-volt supply for Switchboards P.M.B.X. Nos. 2/2A, 2/3A.

Used on A.C. mains with Rectifier No. 94A.

Includes:-
2 x Fuses No. 36/1
1 x Clips for mounting Hydrometer 18A.
25 x Connectors, Secondary, Cell No. 10A.

To be requisitioned separately:-
24 Cells, Secondary, No. 10.
1 x Hydrometers No. 18A.
Cord, Flexible, 250V., PVC. 00006 sq. in.

Drawing - 91630.

Diagram - N658.