V/mm\text{V/mm}

volt per millimeter

Electric field strengthexact by definition

One volt per millimetre, equal to 1000 V/m exactly and therefore identical to one kilovolt per metre. It is the unit printed on insulation datasheets in the lower ranges, and on creepage and clearance tables.

Why it is written V/mm\text{V/mm}: V/mm and kV/m are the same unit written two ways, and both are in circulation. Insulation people write V/mm because their thicknesses are millimetres; power people write kV/m because their clearances are metres.

1 V/mm\text{V/mm} 1,000 V/m\text{V/m}

One volt per millimeter in every electric field strength unit

1,000volt per meter (V/m)
1,000newton per coulomb (N/C)
10volt per centimeter (V/cm)
1kilovolt per meter (kV/m)
1volt per millimeter (V/mm)this unit
0.001kilovolt per millimeter (kV/mm)
0.001megavolt per meter (MV/m)
0.0254volt per mil (V/mil)
0.0000254kilovolt per mil (kV/mil)