11.1.3. Electric chains
For protection of electric chains safety locks of knife type which color corresponds to 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 the protected electric chain. If the safety lock protects several chains, then they need to be connected in turn in order that to determine a faulty chain by burn-out of a safety lock.