Creepage & Clearance

Creepage is conduction of Electric Charges along the surface of an insulating material, in contact with air.

IEC 60079-7

The required values of creepage distance are dependent on the working voltage, the
resistance to tracking of the electrical insulating material and its surface profile.

Creepage distances between bare conductive parts at different potentials shall be as
given in Table 2, with a minimum value for field wiring connections of 3 mm for Level of
Protection “eb” or 1,5 mm for Level of Protection “ec”, and shall be determined as a function
of the rated voltage specified by the manufacturer of the equipment. Alternatively, for Level of
Protection “ec”, creepage distances for other than field wiring connections shall be permitted
to conform to the values given in Annex H (IEC 60079-7)

(Main)