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
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
