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If the marking requirement is not complied by lug vendors on the pad/tongue of the lugs, the same can be pressed into the lugs during crimping, using appropriate dies. Is this acceptable?
I say this because the pressed marking on the crimping part would be compared with the factory markings on the pad/tongue of the lugs for verification.
Even if the factory markings are not provided, the pressed marking on the crimping part would be verified with the catalogues /datasheet of the lugs.
The lugs usually come with a size of lug already stamped on it from the manufacturers (On the flat part of the lug)....... say a 95/12 would mean that this lug is for a 95mm cable and has a 12mm hole - so it can/should be connected by a 12mm threaded bolt.
I think the requirement is for your crimping tool to stamp the lug with the size of die used to do the crimp. (So don't use a pin type crimping tool or pliers or anything else that wont stamp the size of tool used)
Is this some sort of very specialist installation in something like a nuclear plant? Or is it a generic cut and paste spec? If it is the latter go back and question it and ask why explaining that you will be using manufacturers lugs (whoever) and the CSA will be impressed on to the lug by the die.