EQUIPMENT FOR MINING, OIL AND CHEMICAL INDUSTRIES
Type N1882B shown
The need for a modern desk telephone for colliery offices has led to the development of this intrinsically safe version of the Etelphone, which is not only more convenient than the wall instruments in current use but also has the technical and mechanical advantages of the standard Etelphone.
Types N1882B and N1883A are identical except that the latter includes an Operator Recall push-button, whilst the former has a dummy button.
It is approved for pit-bottom offices when connected to the Mine P.A.X. or P.A.B.X. via an E.T.L. Safe Link Unit located above ground; it is not suitable for installation in Mine roadways.
The dial numbers, being external to the dial, are unobstructed and cannot be defaced as they are on the underside of the number ring. The push-button (or dummy button) is above the dial.
Non-slip feet are attached to the telephone baseplate.
OPERATIONAL EFFICIENCY AND APPARATUS
All components are of proven reliability. The risk of low-insulation faults in connecting wires and cords is minimised by the high grade p.v.c. insulation, which is impervious to moisture, fire-resistant, and not subject to attack by insects or mould growth.
The extensible handset cord is p.v.c. insulated.
External wires connect to screw terminals in a moulded desk terminal block which is connected to the instrument by a 4-way p.v.c. insulated straight cord. Terminals for a Type N3130A extension bell are included in the desk block.
The stock telephone is black and is suitable for use in the tropics.
The dial has a 2:1 break-make pulse ratio and a speed of 10 i.p.s. unless otherwise ordered. Marking on the number ring can be modified to customer's requirements.
Taken from the Ericsson Catalogue No. 60
Last revised: October 04, 2019