Answer / virendra

Mr sharma Please note that we have a stady system & all the
equipment is properl earthed . there is no such load like
welding machine is existing.Is it cerculating cureent ??????
as this is a single core cable

Answer / shantanu mishra

This is definitely a case of improper earthing. The
substation earthing is poor. The panel and armoring of cable
need to be more strongly earthed. During normal conditions
there would not be any sparking butwhen there is any fault
on 11kv line nearby, the ground potential suddenly rises and
so the panel comes at a high potential and sparking take
place between panels and armoring of cables which are not
getting proper earth.

Answer / shantanau mishra

Dear Virendra
have you found any solution to your problem. Pl share.

Answer / ahmed

Well,you need to check if you really need to glad the
cables from both side .Or check the type of glad is it
metal or non-metalic .

Answer / rajesh

Use special gland (Gland with bush) at the panel(load side), but ensure the proper gland earthing in first side. The above situation is due to circulating current

Answer / abhishek mishra

Dear Virendra
if you are using CRCA gland plate for glanding then such problem may occur. If you are using single core cables then either use aluminium gland plate or make a thin cut hole to hole in CRCA gland plate

Answer / ravi teja

Mr.Virendra i would like to know the details of load means
which kind of load and ur suitability of ur cable with ur load

Answer / virendra

Dear Ravi,

we are having a load around 300 KW with 200 KW lighting
load & 100 KW of Motive load.

Also note that we have a stable system with balance load

Answer / robertm

It sounds like you have a loop, check and see if the
neutral and the earthing cable are laid down on the same
bars. If this not the incoming service then that could
cause your problem.

Answer / virendra joshi

Guys,

let me clear that the earthing is proper we get the value
0.1ohm. We have used double compress gland which is fixed
in proper way, there no such thing like looping, but still
the problem is there . please share what else can be the
cause ?

Which standard i will refer for size of earthing conductor for equipment? (Eg:415V Switchgear, MCC, DB shall be 50x6mm GI flat)

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