Meter No. 21 | ||||||||
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Resettable meter that registers up to 999 units. These would be fitted to a P.M.B.X. when metering was required. These could be fitted directly to the switchboard or in a wooden Case No. 24, which was fixed to the switchboard. See N1012 for further details. A D91549 plate will accommodate 2 meters and 2 rotary switches, which will allow for two groups of ten lines to have access to a meter each. A D91548 plate will accommodate 5 meters in total. Meters could also be positioned in the jack field section of a switchboard using a Mounting D91550. This mounting accommodates a total of five meters. Meter No. 21A - 20-30volts DC. They required a Metering-Unit No. 3 to operate. Click here for metering schemes and apparatus required - Telephones, PBX, B3104.
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Last revised: August 24, 2024FM | ||||||||
