a question about standard

[MAC702]

Many welding machines, including some Millers, in the US Market are listed with the Canadian Standards INSTEAD of UL.

[eleven7856]

I know that C22.2 No.60-M1990 covers plasma cutting equipment, but if the welding machine is for US market, which standard should be used? Also, I don't know which standard covers rectifier type machine. Beacuse the socpe of UL551 says that it do not cover that kind of machine.

[MAC702]

Keep in mind it may not necessarily be a UL Standard for all machines. Some are listed with the Canadian Standards. That is my limit of knowledge on this subject. I hope you get your answer.

[eleven7856]

Can anyone kindly tell me which UL standard covers the rectifier-type welding machine and plasma cutter.