How to Install Electric Bells, Annunciators, and Alarms. / Including Batteries, Wires and Wiring, Circuits, Pushes, Bells, Burglar Alarms, High and Low Water Alarms, Fire Alarms, Thermostats, Annunciators, and the Location and Remedying of Troubles

by Norman H. Schneider

Joints.

Upon the care with which a joint is made much depends, a loose or poorly made joint will offer much resistance to the current.

The correct way to start a joint in annunciator, or office, wire is shown in [Fig. 22]. About three inches of each wire to be joined is bared of its insulation and scraped bright. The ends are then bent at right angles to each other, hooked together and one end firmly twisted around the other, as shown in [Fig. 23]. Any projecting pieces are cut off, and the joints should then be soldered to prevent corrosion.

Fig. 22

Fig. 23

Fig. 24

Adhesive tape (“friction tape”) is wrapped around the joint, [Fig. 24], and pressed firmly together so that there is no chance of its unravelling. The tape wrapping should extend across the joint and on to about a half inch of the insulation around each wire.