We often get questions and see repairs with problems that can be traced back to the generator, cord, or plug being used while on the roof. This article covers best practices and our suggestions for generators, cords, and plugs for roofing tools like the VARIMAT, SARNAMATIC, and TRIAC ST.
The size of generator you need depends on which tool, and how many, you are using. When using a generator, ensure that the maximum current capacity is never reached as the resulting voltage spikes can damage equipment. We recommend that a generator is not run above 85% of its rated power. If the generator begins to roar, it may have reached its maximum capacity.
The minimum generator capacity required when using only a VARIMAT is 6000W with at least 5000W of continuous output; for a BITUMAT minimum 8000W with at least 7000W of continuous output; for a SARNAMATIC minimum 8500W with at least 7500W of continuous output. If a 120V hand tool, such as the TRIAC ST, will be used simultaneously a continuous output of 10,000W or higher is recommended.
Never turn the generator on or off with the tool connected and switched on. Dirty or water-contaminated fuel, undersized generators, or poorly maintained extension cords can cause voltage spikes which may blow fuses or damage circuit boards in the equipment.
Do not put undue stress on a tool’s electrical cord. Carrying the tool by the cord, using the cord to correct tracking, or otherwise pulling on the cord should be avoided.
Be sure to use a 10 gauge or thicker cable if you plan to make a 30 metre (100 foot) or longer extension cord.
If the cord feels hot to the touch, check that the plug contacts clamp down on the bare wire only and not on the conductors around them.
When installing a plug, be sure to screw down the wire contacts onto the bare electrical wire only and not clamp down on the insulation of the wire. Bad contacts cause sparking which may cause the cord to heat up and could damage the equipment.
When connecting a 230V twist-lock plug to a cord:
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