In addition to being listed under UL 508 for ballast lighting (electric discharge lamp), tungsten and general use ratings, ASCO 920 RC switches have been short circuit tested by UL for use in panelboards:

• 22,000 amps with molded case circuit breaker.
• 100,000 amps with current limiting fuse.

Under UL 67, panelboards having a short-circuit rating over 5000 amps are required to be marked with values specified by UL. Of particular importance is Paragraph 30.2 which states in part:

"A panel board shall not be marked with a short circuit current rating that (1) exceeds the short-circuit, interrupting, or withstand rating of any device intended to be installed therein for that rating..."

When you're selecting remote control switches to meet the short-circuit ratings of your panelboards remember these facts about ASCO 920 remote control switches:

• ASCO 920's can be used in panelboards with molded case circuit breakers which have standard UL ratings through 22,000 amps symmetrical and/or with Class J current limiting fuses which have UL ratings of 100,000 amps symmetrical.
• ASCO 920 ratings are compatible for use with UL listed molded case circuit breakers or current-limiting fuses whose ratings are 125% of the ASCO 920 ratings. The 125% is a minimum value; some ratings are 300%.

For years, ASCO 920 RC switches have been specified by a majority of consulting engineers for use in lighting panelboards. Because all ASCO 920's have short circuit ratings in excess of 5000 amps, they can continue to be specified and used in all panelboards with the assurance that they meet UL 67.

Maximum Voltage Ratings at Rated Amps, Open or Enclosed

When Connected 1 Pole to Load		When Connected 2 Poles to Load on 1Ø and 3 Poles to Load on 3Ø
Ballast	277 VAC	Ballast	480 VAC
Tungsten	250 VAC	Tungsten	250 VAC
General Use	347 VAC	General	600 VAC
For DC service maximum current rating is 75 amps or switch rating whichever is less, with maximum voltage rating of 125 volts when connected 1 pole to load and 250 volts when connected 2 poles to load.

Wire Size For Service And Control1 Connections

Switch Rating (amps)	AL or CU Terminal Lug Wire Range2	No. of Cable per Terminal Lug Connector
30	14-8	1
60-75	12-2	1
100	14-1/0	1
150-200	6-250	1
225	4-400	1
Control circuit connections are supplied with terminals to accommodate a copper wire range of #14 AWG to #10 AWG. Service connections for switches on sub-panels are furnished with solderless lugs to accommodate copper or aluminum wire, except on 30 amp size which is provided with 1/4" studs.

Inrush Current Values and Minimum Recommended
Control Circuit Fuse Size

Switch Rating (amps)	120 Volts, 60 Hz		240 Volts, 60 Hz		277 Volts, 60 Hz		480 Volts, 60 Hz
	Inrush (amps)	Minimum Fuse	Inrush (amps)	Minimum Fuse	Inrush (amps)	Minimum Fuse	Inrush (amps)	Minimum Fuse
30-100	24	8	12	4	11	4	6	2
150-225	30	10	15	5	13	5	7	3
Overcurrent protective device ratings for control circuits should be selected and installed in accordance with the NEC. This table shows the minimum permissible control circuit fuse size, based on the operating coil's momentary inrush current. ASCO-furnished control fuses are rated at 15 amps.

Maximum Distance and Minimum Wire Size
(Between control station and one ASCO 920 switch)

Minimum Wire Size AWG	Maximum Distance (feet)1 for these AC Control Voltages
	120 V	208 V	240 V	277 V
14	750	1650	2760	3950
12	1200	2600	4300	6350
10	2000	4200	6900	10000
1 For Ambient temperatures to 40ºC.