I'm just coming to the end of my 2330 level 3 and have been asked to teach some students Basic Electrical Theory. It is University level and the course is based on lighting for theatre.
I want to explain about bonding of metallic set pieces that have lighting on them and are on stage (i.e actors are either standing on them or could touch them). In the past I have used a 10mm earth clamped to the set piece and taken back to the MET or distribution board (usually a rubber box with commando sockets that has a special earth terminal. Something similar to this http://www.rubberbox.co.uk/on-the-shelf/large-boxes/RUB4201.php
Question is with the 17th Edition assuming that RCD fault protection is in place do I need additional bonding if all the cicuits on the metal set have CPC? Personally I would say it wouldn't hurt to have and extra earth bond but do I really need it? Could I just use 4mm just like supplementary for pipe work, taps, baths etc?
My experience is in the Theatre and live entertainment world so I'm struggling between the domestic/commercial training and my world.
Any comments are gratefully appreciated
I want to explain about bonding of metallic set pieces that have lighting on them and are on stage (i.e actors are either standing on them or could touch them). In the past I have used a 10mm earth clamped to the set piece and taken back to the MET or distribution board (usually a rubber box with commando sockets that has a special earth terminal. Something similar to this http://www.rubberbox.co.uk/on-the-shelf/large-boxes/RUB4201.php
Question is with the 17th Edition assuming that RCD fault protection is in place do I need additional bonding if all the cicuits on the metal set have CPC? Personally I would say it wouldn't hurt to have and extra earth bond but do I really need it? Could I just use 4mm just like supplementary for pipe work, taps, baths etc?
My experience is in the Theatre and live entertainment world so I'm struggling between the domestic/commercial training and my world.
Any comments are gratefully appreciated