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415v Plasma Cutters
3 phase power requirements limit this equipment to industrial use or connection to a generator. Various models to suit all output demands.

415v Plasma Cutters FAQs

Straight answers to the questions people ask most when choosing and using three-phase plasma cutters.

What does a three-phase plasma cutter offer over a single-phase one?icon-minus-redicon-plus-red

A three-phase connection can provide much more power to the machine, so three-phase plasma cutters can reach higher outputs, cut thicker material and work for longer. The power draw is also spread across three conductors, which is smoother and puts less strain on the installation.

They are the usual choice for industrial fabrication, heavy repair and production cutting.

Is 415 volt the same as 400 volt?icon-minus-redicon-plus-red

In practice, yes for most buyers. The UK three-phase supply is commonly called 400 V or 415 V depending on the era and the label, and machines of this type are designed to run on it.

Always check the machine's data plate for its accepted voltage range, and confirm your premises supply falls within it before connecting.

Can I run a three-phase plasma cutter from a normal socket?icon-minus-redicon-plus-red

No. A three-phase machine needs a three-phase supply, and the right plug, socket and protection for its input current. A normal single-phase socket cannot power it.

If you do not have three-phase, you can look at a single-phase machine instead. Do not attempt to modify the supply yourself; have a qualified electrician install or inspect it.

Can I run a three-phase plasma cutter from a generator?icon-minus-redicon-plus-red

Possibly, if the generator has a three-phase output of sufficient continuous rating and stable voltage. The generator must be rated for the machine's full input power with a margin, and be suitable for welding or cutting equipment.

Check the data plate and the generator's manual, and if unsure ask the manufacturers. An undersized generator may cut out or damage electronic equipment.

Does the phase rotation matter when connecting the machine?icon-minus-redicon-plus-red

It can, depending on the design of the machine. Some machines are unaffected by the order in which the three phases are connected, while others, especially those with a cooling fan or built-in air compressor, may run backwards or report a fault if the rotation is wrong.

The manual and data plate for your machine state whether rotation matters. If a fan runs the wrong way or a fault shows after connection, isolate the machine and have a qualified electrician check and correct the wiring rather than guessing.

What size of cable, plug and fuse does a three-phase machine need?icon-minus-redicon-plus-red

That depends on the machine's input current, shown on the data plate and in the manual. The cable, plug, socket and protective device must all be rated for it, and the installation should follow current wiring regulations.

Have a competent electrician fit the supply and check earthing. Never replace a fuse or breaker with a larger one to stop it tripping.