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Answer for USA, Canada and countries running a 60 Hz power supply service.You need a transformer. Either a 277 to 240 volt transformer, to change the voltage, or a buck-boost transformer, to reduce the voltage.


Easy answer, you can't.

Difficult answer, most devices may tolerate a 10% deviation in supply, but some cannot. A 277 Volt ac panel is used primarily for fluorescent lighting, I would not even attempt to use it for anything else.

277 volts is the star point voltage of a three phase 480 volt system. This voltage is too high to try and connect any 240 volt device to it.

Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized


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โˆ™ 2009-11-28 20:44:37
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Q: How can a 240 volt circuit be wired to a 277 volt panel?
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Related questions

How is a circuit breaker panel wired?

how to connect cables to switches 240 box

How do you wire a 240 volt street light circuit?

A 240 volt street light circuit is wired in parallel connections. In the base of the street fixture an inline fuse is connected into the circuit that goes up to the fixture to protect the lamp head.

Can a standard 40 amp 208-240 volt single phase oven be wired to a 240 volt three phase circuit without using a transformer?

See Discussion Page

What size amp circuit breaker should be used for garage?

For the 120 volt outlets on the wall use a 20 amp breaker wired with AWG #12 wire. The circuit must be GFCI protected. Any 240 volt outlets must be wired according to what they will be powering.

Can you convert a 240V circuit on your service panel to two 120V circuits?

A 240 volt breaker can be removed and replaced with 2 - 120 volt breakers. The existing 240 volt breaker should not be used to supply 2 separate circuits.

Why would two 240 volt transformers on different primary phases have their secondary windings wired in series?

What you are probably looking at is a 240 volt three phase system with the secondaries wired in an open delta configuration.

What size wire do you need for a 30 amp 240 volt circuit 400 feet to panel?

A #4 copper conductor will limit the voltage drop to 3% or less when supplying 30 amps for 400 feet on a 240 volt system.

What size neutral for 60 amp circuit?

what kind of circuit? if it's a subfeed from one panel to another same size as hot wires. if it's a straight 240 volt circuit #8. depends on what kind of circuit.

Can one leg of a 240 volt circuit be capped and the circuit breaker changed to make an existing 240 volt outlet into a 120 volt outlet?

Yes, you can always have heavier wire than code requires.

Is 24 voltage a lot?

It depends on the use it is being put to. It is sufficient for a 24 volt circuit. Too much for a 12 volt circuit and too little for a 240 volt circuit.

Can you install gfci on 240 volt circuit?

Yes, GFCIs can be installed on 240 volt circuit. GFCIs protect against electric shocks from ground faults. They trip the circuit if the current is more than a certain level.

Is there any way to split a 30-amp 240-volt circuit so that one branch of it is 30-amp 120-volt and the other branch remains 30-amp 240-volt?

No. This is due to the configuration of the distribution panel. Every breaker to neutral bar is 120 volts. To obtain 240 volts the breaker has to span two of these adjacent breaker spaces. To accomplish what you want will take three spaces. One for the 30 amp 120 volt and two spaces for the 30 amp 240 volt circuit.

How much 6 watt per foot 240 volt heat tape can be put on a 20 amp 240 volt circuit?

A 20 amp 240 volt circuit can provide 4800 watts.4800 watts / 6 watt per foot = 800 feet.

Do you need a 240 volt fuse in each leg of a 240 volt circuit or should you use two 120 volt fuses?

Both legs of a 240 branch circuit need to be fused with a fuse rated at 240 volts or better. The voltage potential across the load is what governs the fuse voltage ratings.

Nz colours in 240 volt circuit what are they?

red orange and yellow

Can you run a 240 volt circuit from a 480 volt supply?

in the direct way no , you must use a converter

Can you supply three 220 -240 volt 16.6 amp infrared heaters with one circuit?

Can you supply three 220 -240 volt 16.6 amp infrared heaters with one circuit?

In a 240 volt single phase circuit A phase is 4000 watts B phase is 7000 watts what is the neutral load?

Question is incorrect. in a 240 Volt single phase circuit, how can you have A phase and B phase?

What causes a 30 amp 240 volt circuit breaker to trip when you turn on the dryer?

Short Circuit

Are Ground fault circuit interrupter GFCI devices available for use on 240 volt 480 volt and 600 volt circuits?

Yes, in the form of GFCI circuit breakers, not as a receptacle.

Is a 10 ampere fuse suitable for 240 volt?

Yes a 10 amp fuse can be used to protect a 240 volt circuit. The amperage rating of a fuse is based on the given amperage load of the circuit. The voltage rating on a fuse must match or be higher than the voltage that is applied to the fuse. In other words you can not use a 240 volt fuse on a 277, 347, 480 or 600 volt circuit but it can be used on a 120 volt, Manufactures of switching equipment today make it impossible to interchange different voltage fuses to be installed in higher voltage switches.

Can you use 240 volt 3 phase to run a machine that is 240 volt single phase?

If it is a four wire (ie grounded) circuit, and the phase to neutral voltage is indeed 240 volts, then you can.

Will GFCI work properly if 240 volt split into one 3 wire 120 volt circuit?


Where do the 240 breakers go in panel?

A two pole, (220-240 volt) circuit breaker can go anywhere in a panel where it will physically fit, connecting to two poles on the buss bar. However, if you don't know this already, you probably shouldn't be fooling around in a live electrical panel. You can get seriously hurt or burned.

What happens if two 240 volt loads are connected in parallel to a 240 volts service?

Nothing happens. That is the way that combined loads are connected from a service distribution panel. If there is only one load on the circuit from the distribution panel it can also be classed as a series connected load. More than one load on the circuit then the classification is changed to parallel.