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BEFORE SWITCHING LAMPS WITH A PECU
When considering switching lamps with a PECU it is very important to first of all determine the type of lamp to be switched and to obtain the technical specifications from the lamp manufacturer with regards to power draw. What is of importance is to consider a combination of current draw and the duration of the current draw during each of the power draw phases of a lamp. Though it is almost impossible to consider each possibility the following general rule may be helpful when selecting a PECU.
For filament lamps do not exceed 80% of the rated PECU amperes times the supply voltage. Thus for a 10 AMP 240 VAC PECU the total wattage of filament lamps in the circuit should not exceed approximately 2000 Watt. (10 AMP x 240 VAC x 80%).
For gas discharge lamps do not exceed the highest current draw during the warm-up phase of the lamp. This needs to be checked with the ballast manufacturer. Some 400 Watt gas discharge lamps may use as much as a 6 AMPS during warm-up draw and thus only one lamp may be switched with a 10 AMP PECU in the circuit. Other 400 Watt gas discharge lamps warm-up maximum current draw may only be as low as 3 AMPS which will allow for the switching of 3 such lamps by a single 10 AMP PECU.