Could I simply install pilot lamp, phase indication on the load side of the isolation point?
This approach has been trialed before by our clients and generally takes the form of fixed pilot lamps that can be read by a non electrician. The thinking being that prior to initiating the isolation all lamps are illuminated and after performing the isolation all lamps are extinguished. This result is taken as being a confirmed isolation. The disadvantages of this approach are as follows: • Poor pilot lamp to neutral connections yield shock voltages on the isolated side of a healthy switch. This point alone is reason enough not to pursue pilot lamps as it leads to potential electric shock situations. • Using a strict testing approach, which is what is required when confirming an isolation, the approach to achieving a high integrity test result involves testing the lamps, testing the switch, testing the lamps = confirmed result. Clearly, when using pilot lamps, the last “testing the lamps” step can not be conducted without reversing the isolation or installing costly self-test circuitr
This approach has been trialed before by our clients and generally takes the form of fixed pilot lamps that can be read by a non electrician. The thinking being that prior to initiating the isolation all lamps are illuminated and after performing the isolation all lamps are extinguished. This result is taken as being a confirmed isolation. The disadvantages of this approach are as follows: • Poor pilot lamp to neutral connections yield the risk of shock voltages on the isolated side of a healthy switch. This point alone is reason enough not to pursue pilot lamps as it leads to potential electric shock situations. • Using a strict testing approach, which is what is required when confirming an isolation, the approach to achieving a high integrity test result involves testing the lamps, testing the switch, testing the lamps = confirmed result. Clearly, when using pilot lamps, the last “testing the lamps” step can not be conducted without reversing the isolation or installing costly self-t
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