EnergySafe Magazine Winter 2018, issue 51 - Page 16

16 Electrical Q&A  Your electrical questions answered! Compiled by ESV’s Electricity Technical Advisor, Simon O’Leary energysafe continues its regular series featuring some of the questions that ESV receives on a range of electricity installation issues, some of them relating to gas installations. Also provided are the references to the Acts, Standards, Regulations and Clauses that apply to them. Question Answer Standard When will the new AS/NZS 3000, wiring rules be out? The new AS/NZS 3000:2018 – The Australian/New Zealand Wiring Rules, were published on 26 June 2018. AS/NZS 3000:2018 will supersede AS/NZS 3000:2007. AS/NZS 3000:2018 Clause ESV acknowledges that some electrical installation work would have started before the publication of the 2018 edition and will therefore not mandate the 2018 edition until 1 January 2019. This will allow the electrical industry a six-month transition period to complete the electrical installation work currently undertaken to the 2007 edition. The standards can be purchased online from SAI Global. Looking at the new 2018 Wiring Rules, is it correct that all final subcircuits in a house need to be on RCD? Yes. The 2018 Wiring Rules states that: “Additional protection by RCDs with a maximum rated residual current of 30 mA shall be provided for all final subcircuits in domestic and residential electrical installations. AS/NZS 3000:2018 Clause AS/NZS 3000:2018 Clause Electricity Safety (Installations) Regulations 2009. Regualtion 238 Where protection of final subcircuits is required, RCDs shall be installed at the switchboard at which the final subcircuit originates.” I am replacing a switchboard in a house, and only the circuits for the socket-outlet are on RCDs. Looking at the new 2018 Wiring Rules, do I need to put an RCD on all the final subcircuits if it’s just the switchboard I am working on? Yes. You will need to install RCDs to protect all the final subcircuits. Alterations to installations and replacement of switchboards, of the new Wiring Rules states that: “Additional protection by RCDs shall be provided in existing electrical installations where alterations or a switchboard replacement is completed. The following provisions shall apply: (b) Switchboard replacement Where all of the circuit protection on a switchboard is replaced, additional protection by RCDs as required by this Clause (2.6) shall be provided for the final subcircuits supplied from that switchboard.” How many apprentice electricians can an A-class electrician effectively supervise? An employer of electrical workers should ensure that the ratio of supervisors to apprentices is 1:2 under direct supervision and 1:4 under general supervision. One supervisor is to supervise no more than two apprentices under direct supervision at any one time. One supervisor is to supervise no more than four apprentices under general supervision at any one time. ESV has produced an extensive guide on the requirements for the effective supervision of apprentice electricians. This is available on our website. ESV has also produced two training videos to assist in supervisors of apprentice electricians. The first video is designed to provide guidance for the supervisors of apprentice electricians. The second video is designed to provide guidance to the apprentice electricians and make them aware of some of the hazards they might encounter working in the electrical industry. These videos along with other information are available on our website −