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Electronic Theatre Controls Inc

Sensor Module and Rack AIC ratings

Module/Rack AIC Ratings

A.I.C. is an acronym for "Ampere Interrupt Current". It has been replaced recently by the term "RMS Symmetrical Current". The AIC rating is the maximum current that can flow through a piece of equipment without permanent damage. If a direct short is applied between the phase bars of a rack, this allows the current protection to trip before damage occurs.

At ETC, we typically use this term when referring to dimming racks. Here are the guidelines:

Sensor SR/SRN Series Racks

The dimmer module in the rack with the lowest AIC rating determines the AIC rating for the entire dimming rack.

For Unison DR Series Racks

The racks have the following AIC ratings:

DR6 Maximum of 10,000 AIC
DR6 at 277V Maximum of 14,000AIC
DR12 Maximum of 22,600 AIC
DR12 with Aux Rack  Maximum of 66,800 AIC

You apply the DR rack rating first and then, the dimmer module in the rack with the lowest AIC rating determines the AIC rating for the entire dimming rack. (A D20 with an AIC of 100,000 in a DR6 would give you a total AIC for the installation of 10,000)    

AIC ratings for Dimmer Modules

Model # Description Risetime Voltage AIC Compliance
D15 Dual 1.8kw dimmer 350uS 120v 100,000 UL, cUL
D15E Dual 1.8kw dimmer 500uS 120v 100,000 UL, cUL
D15AF Dual 1.8kw dimmer 500uS 120v 100,000 UL, cUL
D15AFN Dual 1.8kw NC dimmer 500uS 120v 100,000 UL, cUL
D15AFG Dual 1.8kw GFI dimmer 500uS 120v 100,000 UL, cUL, UL943
D15F Single 1.8kw (3 wire Fluorescent) Dimmer 0uS 120v 10,000 UL, cUL
CC15 Dual 15A Constant Current Circuit Breaker 0uS 120v 10,000 UL, cUL
BC15 Dual 15A Branch Circuit Breaker 0uS 120v 10,000 UL, cUL
R15AF Dual 1.8kw relay N/A 120v 10,000 UL, cUL
D20 Dual 2.4kw dimmer 350uS 120v 100,000 UL, cUL
D20E Dual 2.4kw dimmer 500uS 120v 100,000 UL, cUL
D20AF Dual 2.4kw dimmer 500uS 120v 100,000 UL, cUL
D20AFN Dual 2.4kw NC dimmer 500uS 120v 100,000 UL, cUL
D20AFG Dual 2.4kw GFI dimmer 500uS 120v 100,000 UL, cUL, UL943
D20HR Single 2.4kw dimmer 800uS 120v 100,000 UL, cUL
D20F Single 2.4kw (3 wire Fluorescent) Dimmer 0uS 120v 10,000 UL, cUL
CC20 Dual 20A Constant Current Circuit Breaker 0uS 120v 10,000 UL, cUL
BC20 Dual 20A Branch Circuit Breaker 0uS 120v 10,000 UL, cUL
R20AF Dual 2.4kw relay N/A 120v 10,000 UL, cUL
D50AF Single 5kw dimmer 500uS 120v 100,000 UL, cUL
D50AFN Single 5kw NC dimmer 500uS 120v 100,000 UL, cUL
D50HR Single 5kw dimmer 800uS 120v 100,000 UL, cUL
CC50 Single 50A Constant Current Circuit Breaker 0uS 120v 100,000 UL, cUL
D100AF Double 12kw dimmer 500uS 120v 100,000 UL, cUL