Page 1: ... or bus and control circuit wires An experienced licensed electrician should install the RC Switch Each ASCO 920 RC Switch has a ratings identification label defining load types and maximum voltage ratings Use the switch only within the limits shown on this label Do not exceed the values on the rating label Exceeding the rating can cause personal injury or serious equipment damage TABLE OF CONTENT...
Page 2: ...es and minimum wire sizes that can be run between a control station and one ASCO 920 switch Table A Line Run Min Wire Size Maximum Distance feet 1 for these AC Control Voltages Wire Size AWG 120 V 208 V 240 V 277 V 14 12 10 750 1200 2000 1650 2600 4200 2760 4300 6900 3950 6350 10000 1 For ambient temperatures to 40 C Do not exceed these distances for proper switch operation Line run can be extende...
Page 3: ...Station Make sure control stations do not have overlapping contacts RC Switch tries to open or close but cannot 1 Check Voltage Make sure control line voltage is at least 90 of nameplate coil voltage 2 Check Line Run Wire Size Make sure control line size and distance is within the requirements of Table A page 1 3 Check VA Burden of Transformer If a transform er is used in the control line make sur...
Page 4: ...ned type control station Acc 53B or 53C Order Catalog 32lA40 and specify relay coil voltage Three Wire Control Optional Accessory 48 Acc 48 is an auxiliary relay panel for 3 wire control of the ASCO 920 It has two relays One relay must be energized to open the ASCO 920 contracts the other relay must be energized to close the ASCO 920 contacts Therefore use a single pole double throw momentary type...
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