Should be a single phase appliance.

Current up to 21A, your home wire at least 2.5 square copper wire, otherwise, the wire heat, the meter should also be considered.

No single-phase socket that big, to use a 32A air switch with leakage protection, direct mounting. The enclosure should be grounded.?

Residual current protection, which is earth leakage protection, is about $50 for a 32A? Name brand 95. for safety, or install.

Circuit insurance should also be considered, the selection is not appropriate, easy to short.