Earthing the base of a metal standard lamp

[Msitekkie]

But the base doesn't need earthing, the lampholder does!

Struggling with that, as the original earth appears to have been connected to the base (does that count as "manufacturers instructions"? ) & Some here suggesting there is no earth connection on the original lamp holder.
Let's say for arguments sake the cable became frayed at the base of the lamp holder from the cable being moved about & the body of the lamp became live, are we still relying on the earth to the lamp-holder?
I should possibly mention here that the core of the lamp is also telescopic.

 

[westward10]

What was done in the past is neither here nor there. You need a new lamp holder which incorporates an earth terminal, a lamp holder which will fit securely to the existing thread.

 

[davesparks]

Struggling with that, as the original earth appears to have been connected to the base (does that count as "manufacturers instructions"? ) & Some here suggesting there is no earth connection on the original lamp holder.
Let's say for arguments sake the cable became frayed at the base of the lamp holder from the cable being moved about & the body of the lamp became live, are we still relying on the earth to the lamp-holder?
I should possibly mention here that the core of the lamp is also telescopic.

It doesn't matter where the original earth was connected, the original cable and connections are obviously long gone and how it was done will forever be a mystery.

As you are rewiring this you are taking responsibility of manufacturer for this.

The metal base etc contains an insulated and sheathed cable, the only part of the lamp which contains single insulated conductors is the lampholder. Therfore the part which needs to be earthed is the lampholder.
The rest of the metal parts will obviously have a connection to earth via the lampholder being screwed onto it.

If the cable becomes frayed in any normal and foreseeable use of the lamp then you have failed to secure it or protect it correctly.

 

[Msitekkie]

What was done in the past is neither here nor there. You need a new lamp holder which incorporates an earth terminal, a lamp holder which will fit securely to the existing thread.

OK. What

It doesn't matter where the original earth was connected, the original cable and connections are obviously long gone and how it was done will forever be a mystery.

As you are rewiring this you are taking responsibility of manufacturer for this.

The metal base etc contains an insulated and sheathed cable, the only part of the lamp which contains single insulated conductors is the lampholder. Therfore the part which needs to be earthed is the lampholder.
The rest of the metal parts will obviously have a connection to earth via the lampholder being screwed onto it.

If the cable becomes frayed in any normal and foreseeable use of the lamp then you have failed to secure it or protect it correctly.

OK. Thanks for that. I will do as suggested & PAT test the earth resistance at the base. Hopefully OK. Just a little concerned about the number of moving parts between lamp holder & base (screw on brass ring plus telescopic pieces, that might potentially get oiled) & how much resistance this might introduce. I think the telescopic bits are brass (are on the outside anyway), so hopefully not liable to corrosion.

 

[westward10]

It is only the brass lamp holder which needs to be earthed. If the cord is installed correctly and correctly protected/restrained where it enters the lamp it is fine.

 

[Msitekkie]

It is only the brass lamp holder which needs to be earthed. If the cord is installed correctly and correctly protected/restrained where it enters the lamp it is fine.

OK.Thanks for that reassurance.