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UNDERSTANDING DIMMER CAPACITY

Lighting designers and technicians must understand the science of electricity andhow electrical theory affects lighting applications. One of the more important applicationsof this is determining the number of lighting instruments that can be safely connected tothe lighting system.

A simple mathematical formula related to electrical capacity in a system is W = (V)A or Watts = Voltage x Amperage. This is sometimes called the West Virginia rule for short because of thebecause of the WVA abbreviation. When applied to a lighting system, this simple formulahelps the technician understand how many lighting instruments can safely be pluggedinto one dimmer.

Many dimmers are rated at 20 amps. Standard electrical service in the US is 120 volts.Using the West Virginia rule, we see that each dimmer can safely control up to 2400 watts of power.

W = (V)A . 120 volt service at 20 amps = 2400 watts.

Understanding that each dimmer has a cUnderstanding that each dimmer has a capacity of 2400 watts (2.4 KW) it is simply amatter of adding up the wattage of each lighting instrument to know how many cansafely be plugged into one dimmer. If this number exceeds 2400w, then it is unsafe.If it is less than 2400w, then it is safe. If it equals the amount, it is technically possible but not recommended for use.

Below are a list of common instruments and their wattage. Using the information given, determine if the following scenarios are possible:

•• Source 4 Ellipsoidal 575W• Source 4 Par 575 W• 6” Fresnel 500W• PAR64 1000W (1 KW)• Far Cyc 1000W (1 KW)

Will this number of instruments work, if plugged into 1 dimmer?

1. 2) Source 4’s; 1) 6” Fresnel; 1) PAR6422. 2) 6” Fresnels; 1) Source 43. 2) Far Cyc’s; 1) Source 4 Par4. 1) 6“ Fresnel; 1) PAR 645. 2) Source 4’s; 1) 6” Fresnel

How many dimmers would be required for this number of instruments?

6. 4) Source 4 Pars?7. 6) Far cycs; 10) Source 4 Pars; 2) PAR64; 3) 6” Fresnels88. 2) PAR64; 2) Source 4’s9. 9) 6” Fresnels; 9) Source 4’s10. 5) PAR64

DANCE PRODUCTION: DESIGN & TECHNOLOGY - ©Taylor and Francis 2016

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