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Can you use a 500V megger tester to test a 6.6KV motor?

You can, and you will get a reading if the leakage is within the operating parameters of the megger or there is a dead short in the windings. Most larger voltage motors need higher testing voltages. A hi-pot tester will deliver these higher voltages.


What size transformer do you need too feed two 200 amp panels?

You could do it with a 10kVA transformer, provided you're not operating either panel at anywhere near full capacity (as in most residences). If you're setting up a commercial installation, you might need closer to 70kVA to operate at full rated capacity (i.e., 80 percent of the load center rating).


What is the most popular polyphase circuit?

Three Phase


Why is not feasible to operate bulbs a low voltages although it amount to high efficiency?

Lamps (not 'bulbs' ; we plant bulbs!) will only produce their rated power at their rated voltage. These values are printed on the glass envelope. Reducing the voltage applied to a lamp will, therefore, reduce the power it produces. In fact, there's not a simple, linear, relationship between a lamp's voltage and its power, and this means that even small reductions in voltage will result in large reductions in power.Operating lamps, or any devices, come to than, at lower voltages really has nothing to do with efficiency. Certainly, operating a lamp below its rated voltage will most-certainly NOT result in high efficiency. Efficiency is defined as the ratio of output power to input power and has nothing to do with voltage.


Why is alternating current low voltage?

Alternating current is not necessairly low voltage, on the controrary AC is more oftenly used for when high voltage is needed. Most power distribution systems (extremely high voltages) use AC because AC is easier to transform to high voltages (using the aptly named transformer). High voltage is needed for power distribution to decreases losses due to transmission.