Interested in Language
In the manual about safe working practises, section about scaffolding, I have come across this sentence:
Tubular steel scaffolding not to be used for earthing the welding equipment.
Is it really true that tubular steel scaffolding IS used for earthing the welding equipment.
Is this a harmful / wrong practice?
What is your opinion?
Any conductor of electricity (such as metal scaffolding) can be a path to complete an electrical circuit such as the one used for arc welding. Living in China, I've seen some truly scary welding equipment and practices.
Scaffolding has many connections from one end to the other, so it's not a reliable path to ground (or earth). Electric current always seeks the most direct path, and the human body, though not a particularly good conductor, can also become the conductor, and that is why it's not safe to rely on scaffolding.