More than rated current.Acquaintance just connected a 208 3 phase grill to a 240 system ignoring advice to install B-B transformers. In the real world what can they expect ?
More than rated current.
Wouldn't the current be less? If its 208 @20amps then 240 would be 17.33 amps.
Wouldn't the current be less? If its 208 @20amps then 240 would be 17.33 amps.
You have to use ohms law and figure the resistance of the heating elements at rated voltage...
Thanks, I see the increase now. Not sure what I was thinking in my post above.
That one could still be a little tricky as incandescent lamps are not a fixed resistance, the resistance of the filament will vary with temperature changes, that means if you are not applying full 120 volts the temp will not be as high and resistance may be lower then it is when operating at 120 volts.I remember I got this wrong on a Physics test in high school. We were given a question with a 60W and 100W lightbulb in series on a 120V circuit, and asked what the power used by each bulb would be. I didn't realize that the wattage ratings were only valid with a voltage drop of 120V, and thought the answer was 100W and 60W.
Can the heat elements be re-configured in any way or are they fixed?Acquaintance just connected a 208 3 phase grill to a 240 system ignoring advice to install B-B transformers. In the real world what can they expect ?
Although it's output will be higher it might last a long time without any problems. I've been running a 208 volt heater at 240 volts (actual voltage is about 248 volts) for years in my garage.
This is a case where I would not do it for a customer or my own home.
To do so with full knowledge that the elements are going to be running much much hotter than they, the element mounting means, the terminals on the elements or the enclosure they are contained in are designed for is at best a poor choice and at worst a fire.
Think about resistive heating.Wouldn't the current be less? If its 208 @20amps then 240 would be 17.33 amps.
I identified a good deal on a back boost transformer to buvkmthe voltage but was ignored. They continue to replace motors.
???
I'm assuming you meant "buck" boost transformer and can only guess you were saying "buck the" for the part in red.