For protection of electric chains safety locks of the knife type which color corresponds to a current of protection of a safety lock are used. Serviceability of a safety lock is determined by presence of the wire conductor connecting contacts of a safety lock. For replacement of the failed safety lock previously switch off the corresponding electric chain, take a safety lock from a nest tweezers. If again established safety lock instantly fails when giving tension, check a protected electric chain. If the safety lock protects some chains, they are necessary for connecting in turn in order that by a peregoraniye of a safety lock to determine a faulty chain.
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