Their placement and number usually follow from that geometry, in relation to the chloride profile, for example. With this type of system the anodes can be placed exactly where corrosion hotspots have been found. Slots are usually cut between the anodes to conceal the connections, so the wiring is less visible and less vulnerable to damage. Drilled-in anodes are particularly suitable where depth of effect is needed, for instance at expansion joints in viaducts.
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