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Correction

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[...] whenever dealing with powering portable dimmers, follow these guidelines: * Always read the specifications of any equipment before applying power * Never power a device using voltage other than the rated voltage of a device * Only qualified personnel should attempt to configure power distribution equipment A circuit breaker is designed to protect against an overload or a short circuit. When you are powering a portable dimmer from a branch circuit (meaning the circuit fed from a common circuit breaker in the final leg of the power distribution), then the rated voltage of the device should match the voltage of the circuit.

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									Correction


Powering Portable Dimmers in the Theatre
[We at Stage Directions made an error that we would like to           a 15-amp, 20-amp, 30-amp, or more, device. If it has
correct immediately. In the process we hope to open new por-          an Edison plug (NEMA 5-15) then it should be a 15-A
tals of discovery for the practicing theatre electrician or techni-   device. If it has a 20-amp plug (NEMA 5-20) then it
cian. Richard Cadena, editor of PLSN magazine and an ETCP             will still work with an Edison T-slot receptacle (NEMA
Certified Entertainment Electrician and an ETCP Recognized            5-20R) because it is a 20-amp circuit that works with
Trainer, explains more below. —Jacob Coakley, editor, Stage           15A and 20A plugs. If the device needs more than 20
Directions]                                                           amps then it should have a connector that will not
                                                                      plug into an Edison receptacle.


I
   n the article “Mind Over Fiscal Matters” by Dave McGinnis             In a 120/208V four wire plus ground system (green,
   in the March issue of Stage Directions, there were some            white, black, red, and blue wires), the voltage across
   inaccuracies. The subject of concern centers on the                any hot leg (black, red, or blue wire) to the white
proper application of portable dimmers, supply capacity to            neutral conductor is 120V and the voltage across any
feed those dimmers, and overcurrent protection devices,               two hot lets on different phases is 208V. A 208V circuit
commonly known as circuit breakers.                                   uses a double-ganged circuit breaker with two poles
                                                                      that feed from two hot legs on different phases. These
  In short, whenever dealing with powering portable                   branch circuits are typically connected to a locking
dimmers, follow these guidelines:                                     receptacle such as a NEMA L6-15 or an L6-20. There are
  • Always read the specifications of any                             a few different connectors that could be used for 208V
    equipment before applying power                                   devices, so if the portable dimmer pack doesn’t have
  • Never power a device using voltage other                          an Edison connector, then be sure to check the specs
    than the rated voltage of a device                                and match the voltage to the circuit correctly.
  • Only qualified personnel should attempt                              Portable dimmers that have two power cables are
    to configure power distribution equipment                         using two distinct circuits to double their dimmer
                                                                      capacity. For example, the Leprecon ULD-360 dimmer
   A circuit breaker is designed to protect against an                has two NEMA 5-15 plugs. Each plug is capable of sup-
overload or a short circuit. In North American theatres               plying 15A at 120V, which is 1800 watts. By using two
we most often use a molded case single-pole circuit                   power cables, a single dimmer pack can supply 3600
breaker, meaning it switches only one wire, which is                  watts. This is typically done so that you can us
								
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