Alan Wilson asks this question of the day about the main equipotential bonding conductor to oil and duct work in a workshop. It is answered by the ECA (Theme – Fire & Safety):
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| Pipes in a workshop need a main earth bond? |
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Question: Do pipes carrying oil in a mechanic’s workshop require a main earth bond?
These pipes do not leave the building and carry the oil from plastic tanks contained within the same building. The pipes are also suspended off the main steelwork of the building, which has a main equipotential bonding conductor to it. The oil is pumped through the pipes with the use of air, so there are no electrical connections anywhere in the system.
Secondly, there is ductwork running down the workshop to extract fumes out the building - the fan itself is situated outside on top of a raised concrete platform (about 6m high). The ducting again is suspended from the steelwork of the building. Would this require a main equipotential bonding conductor back to the MET?
Answer: If the pipes and ductwork are suspended from the structural steelwork, it is likely they are effectively connected to the MET through the steelwork. Check the continuity to see if this is so.
If for some reason they are not effectively connected, bond them to the structural steel, which is - in turn - bonded.
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