Boat anodes do an essential job on any boat. However, unless you check the resistance when you replace one, your new anode may do absolutely nothing to protect your boat's systems.
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It is often assumed that if you bolt an anode to something it will automatically be electrically connected to it. This is often the case but not always.

In my day job I work offshore and when we mobilise our systems on to ships or platforms one of the very first things we do is connect the earth cable from our container to the vessel. (We operate underwater robots and on some systems we send 3000 volts subsea, so the consequences of a mistake could be fatal) After connecting the earth cable - a crimped ring terminal on a large diameter copper cable - to the welded earth stud on the vessel, the resistance is measured. It is often found to be out of limits and the connections need to be cleaned with a wire brush and the connection remade to obtain the low resistance required...

Many of us will have seen boat anodes which have been in the water for a season or more and don't appear to be wasting away. Due to the low voltages involved in cathodic protection systems it doesn't take much resistance at all to prevent anodes doing their job. This can easily be avoided by taking 30 seconds to check the resistance with a multimeter whenever you replace an anode. We show you how to do that in this video.

This is an excerpt from the following "Boat Work" video: [ Ссылка ]

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