30 amp variac instead of an autoformer?
Hi, I've been looking for a 30 amp autoformer for some time. I wonder if this item would "fill the bill". 30 amp variac $169 Here is the company listing: variable ac transformer
Forum Discussion
Don these devices boost or buck voltage solely by percentage. Forget the dial, it is utterly misleading.
Voltage can not vary to the point of exceeding the percentage allowable. Drooped AC line at 105 volts should be boosted to 120. This is a finite percentage (which I will allow you to calculate)
But if that 105 volts for any reason decide to rise to say 115 volts, multiply the percentage gain to apply to 115 volts base and what do you get?
Boost or buck, percentage calculation, and knowledge of line voltage trends and tendencies will give you the tools to decide if variac usage is rational.
"Been here eight months and line voltage has never gone over 109 volts" is tempting, isn't it?
Voltage can not vary to the point of exceeding the percentage allowable. Drooped AC line at 105 volts should be boosted to 120. This is a finite percentage (which I will allow you to calculate)
But if that 105 volts for any reason decide to rise to say 115 volts, multiply the percentage gain to apply to 115 volts base and what do you get?
Boost or buck, percentage calculation, and knowledge of line voltage trends and tendencies will give you the tools to decide if variac usage is rational.
"Been here eight months and line voltage has never gone over 109 volts" is tempting, isn't it?
