Galvanised Band as Earthing?

[biggal5]

Hi,

just a quick one please. I'm doing a CU change over domestic, all initial tests are fine with final circuits etc. Just one thing concerned about. the main earthing conductor is a galvanised band type welded onto the incoming sheath (TN-S), screwed to the metal cut-out main fuse housing (1361 Type2), then onto the MET.?

I haven't seen this before so was just wondering if that is acceptable amongst you more experienced electricians? The Ze is all fine and well within limits (0.26)... I dont want to cut off the existing connection to the incoming as this seems well connected and I don't want to compromise.??

Thanks.

 

[Darkwood]

Sounds like a typical earthing band found on some incoming DNO supply cables ... a pic would be good?

 

[7029 dave]

Quite standard your ze is fine, why are you worried?.

 

[biggal5]

Thanks, wasn't worried, just curious as haven't seen it before and wasn't sure if it was standard or typical practise at some time. thought i'd try get some feedback.

 

[overskilled]

Probably tinned copper, queried it with a local dno as saw something similar on a lead sheathed TNS supply recently...with a less than neat make off...Ze was 0.06 so appearances in this case were deceiving.

 

[Rockingit]

Probably tinned copper, queried it with a local dno as saw something similar on a lead sheathed TNS supply recently...with a less than neat make off...Ze was 0.06 so appearances in this case were deceiving.

Would galv/tinned band be up for a Pefc of around 4K, though? I have no idea, but it sounds a little on the puny side to me.

 

[VoltzElectrical]

See it all the time on streetlighting. One incomer (lead sheath) into Pillar, then 3 or 4 outgoing. All cables with sweated on perforated band then usually a robust bare cable bolted to it going onto a bolt on the pillar itself.

Usually tests out fine.

 

[Engineer54]

Probably tinned copper, queried it with a local dno as saw something similar on a lead sheathed TNS supply recently...with a less than neat make off...Ze was 0.06 so appearances in this case were deceiving.

Yep, the band (normally perforated with 2BA or larger holes) will almost certainly be tinned copper!!!

 

[telectrix]

geordie's the best expert on this subject:

1. he used to be in a band.

2. he wants galvanising to preserve for future generations.


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