Pòt dife yo klase nan Klas A, Klas B ak Klas C selon rezistans dife yo. Tan rezistans dife nan pòt dife Klas A pa dwe mwens pase 1.5 èdtan, sa a nan pòt dife Klas B pa dwe mwens pase 1 èdtan, ak pòt dife Klas C pa dwe mwens pase 0.6 èdtan. Diferan kote yo dwe ekipe ak pòt dife nan nivo korespondan pou itilize.

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