Maintaining the Case

The case of the device provides the following functions:

• Functional insulation between adjacent phases and between the phases and the exposed conductive.

• An insulation barrier to prevent users from touching live parts.

• Protection against the effects of electrical arcs and overpressure caused by short-circuits.

The case also fulfills an operational function by supporting the entire pole operating mechanism as well as the mechanical and electrical accessories of the switch disconnector.

On the case, there should be:

• no traces of grime (grease), no excessive dust, and no condensation which all reduce insulation.

• no signs of burns or cracks which would reduce the mechanical solidity of the case and thus its capacity to withstand short-circuits.

The case must be replaced if there are signs of burns or cracks. Preventive maintenance for the case consists of:

• A visual inspection of its general condition.

• Cleaning with a dry cloth or a vacuum cleaner.

• Measuring the case insulation resistance and the resistance of the breaking unit input/output contact. It is advised to measure the insulation every five years and following trips due to a short-circuit.

All cleaning products with solvents are strictly forbidden.