If it is necessary for the gland to form part of the circuit protective conductor, a gland that provides a protective connection to earth should be selected, in accordance with the following recommendations in IEC/BS/EN 62444
Category A glands should be selected for use in installations where the cable has light armour or braid, which might be the limiting factor for the magnitude and duration, of the earth fault current. Where glands of category A are used, an adequate earth connection can be achieved by fixing the gland into a suitably earthed metal enclosure.
Category B glands should be selected for use in installations where the magnitude and duration of the earth fault current could exceed the maximum values at which a category A gland is tested. For category, B either a gland with an integral earth connection or a suitable accessory (e.g. an earth tag) should be used.
Category C glands should be selected for use in installations where the magnitude and duration of the earth fault current could exceed the maximum values at which a category B gland is tested. For category C a gland with an integral earth connection should be used. CCG has a full range of glands independently tested to perform to categories A, B and C.
Earthing is the process of creating an alternative path for the flow of fault/excessive currents safely into the ground in the presence of minimal resistance or impedance.
Integral Earth Cable Glands
The CCG IE gland is designed for MV and HV installations where an external protective connection with low resistance from the gland to earth is needed.
The CCG IE gland range has been independently tested to the maximum short circuit fault current ratings as per IEC 62444 which are:
Insulated Cable Glands
The CCG Insulated gland is designed for earth neutral systems whereby the armour of the cable is isolated from the equipment in order to reduce electromagnetic interference on sensitive instruments or for stopping circulating eddy currents developing on single-core cable installations.