unistrut lighting system

[Cadgey123]

As you said there is no cpc in this circuit, or have I got the wrong end of the stick?

Ah yesss I missed this.

Well swap for at least a class II fitting or rewire the circuit if you are going to change all the fittings anyway. Small cost probably.

 

[bomjac]

Half the lighting systems in the North Sea are installed using unistrut and braid armored cables run inside them. Said cables then pop out of the capping at each end of the fitting for glanding.

I don't see an issue using the Unistrut here as a raceway, but I would use a sheathed flex rather than singles. Certainly it's going to be much cheaper than installing trunking for everything and represents a reasonable middle road here.

 

[drzsta]

Don't really understand the issue here? Factory manager has already agreed to rewire the lighting so just use something with sheathing like nyyj or fp.

 

[snowhead]

When I started in 1967 we were using a lighting trunking made by FAL (Fluorescent Applications limited.)
It had exactly the same profile as Unistrut does now, it's advantage then over thin sheet trunking was needing far less supports.
It was available in Zinc /Galv or whatever Unistrut is now and also available powdercoated, to any colour if you bought enough.
It had plastic or metal capping and fixings specifically for hanging fittings.

I beleive FAL trunking developed into Unistrut, but can't find any online reference.

 

[Toneyz]

That looks like lighting trunking to me. You say there is no CPC this may be because the containment is the CPC.

 

[rockrose]

yea there is no cpc and looks like the unistrut is the earthing.I think Snowhead is correct it dates to the 70/80 time period.Will give the boss all the options as discussed thanks for all your help everyone

 

[Marvo]

From what I see in the photos the unistrut looks like it's in good serviceable condition and looks to be competently installed. As already mentioned it may be that it's also being used as CPC.

From the info given by others in this thread it doesn't sound like it would warrant any kind of non-compliance coding so if they're not keen on replacing with trunking I personally wouldn't see a problem with the unistrut staying if the earth impedance tests are good or can easily be restored by installing an additional CPC wire.