Earthing SWA at lampposts with plastic fuse enclosures ?

[Paulbrown95]

Hi All,

Just finished testing lamp post supplies pre LED upgrade for a company where the measured Zs exceeds maximum permitted on all circuits. DB change is in the pipeline but brings its own issues with inrush current and what type of MCB to utilise due to the poor Zs readings. Current earth for the lamp posts is the SWA of the 6mm SWA which is jubilee clipped with a 6mm flying lead, this has led to corrosion which i think is affecting the earth readings. The fuse carrier enclosures are plastic and wont take an SWA gland.

Does anyone know of any clamps that are allowed for use with SWA ? I've seen ones for use with 11kv and 33kv cables which have solid spit rings to prevent crushing the cable, is there any alternative for a smaller sized armour ?

Thanks

 

[SparkyChick]

Something like these....

Central Earth Terminal (CET) for Steel Wire Armour (SWA) Cable Termination of Street Lighting Cables

Central Earth Terminal (CET) - THORNE & DERRICK are Specialist Distributors of LV MV HV Jointing, Earthing, Substation & Electrical Eqpt. Contact us today.

www.powerandcables.com

 

[loz2754]

All the lamp post cutouts I've ever seen have a twin swa gland plate built in to the base.