520-9. Branch Circuits. A branch circuit of any size supplying one or more receptacles shall be permitted to supply stage set lighting. The voltage rating of the receptacles shall not be less than the circuit voltage. Receptacle ampere ratings and branch-circuit conductor ampacity shall not be less than the branch-circuit overcurrent device ampere rating. Table 210-21(b)(2) shall not apply.
210-20(a) Continuous and Non-continuous Loads. Where a branch-circuit supplies continuous loads or any combination of continuous and non-continuous loads, the rating of the overcurrent device shall not be less than the non-continuous load.
Exception: Where the assembly, including the overcurrent devices protecting the branch circuit(s), is listed for operation at 100 percent of its rating, the ampere rating shall not be less than the sum of the continuous load plus the non-continuous load.
And words from ETC:
Since the ETC dimmers are rated at 1200 or 2400 watts, and if your overcurrent protection is a branch circuit breaker listed for 100% operation, you can fully load the dimmer. If your loads operate in a non-continuous manner (continuous is defined as "A load where the maximum current is expected to continue for three hours or more"), you should also be able to load the dimmer beyond the 80% limit.
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Topic: 2 575 Watt Fixtures on a 1200W Dimmer - Will they hold? (Read 5918 times)