Will 240v tools corrode my hull?
I am fitting out a steel-hulled boat using an extension lead from a shore power base for 240-volt hand lamps and power tools. Will this cause hull corrosion as the boat is in the water at the harbour? It has 24 large anodes.
QDoes ‘harbour’ imply salt water? This has more dangers because of its lower electrical resistance. Twenty-four anodes sounds like a substantial
Aseagoing boat. If you are using mains extension leads to power your tools directly with no boat wiring, you need to be sure an RCD is fitted.
You should also use 110-volt (building site standard) lamps and tools via a proper site transformer to reduce any danger from wires being damaged on steelwork or water/damp getting in. As long as the insulation is not compromised there should be no danger to your hull, because no circuit can exist between the hull, water, land and the electricity company’s earth protection. But if you are using permanent shoreline mains wiring in the boat, safety requires at least one RCD. For that to operate, you will need a single mains earth bond to the hull.
This requires professional advice and ideally fitting by a qualified person who can discuss whether an isolation transformer (pictured, right) or a galvanic isolator (left) would best suit you. Using neither could result in hull corrosion.
Remember, mains electricity can kill so you should take professional advice.