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Kitchen upgrade. Electrical installation and isolation switches

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I’m in South Australia in case it makes a difference to rules! Installing a new flat pack kitchen soon with Gas cook-top (bottled gas) and electric under bench oven. I have seen and been told, conflicting things regarding the legal requirements for an isolation switch. If I have a Gas cook-top, do I still have to have an isolation switch installed for the Electric oven??
Thanks in anticipation, Lesley N.