It was the same frustration with worthless contractors that led me to qualify in the first place. Today I make sure that when I go sleep I have made an installation safe for someone somewhere. I now have the knowledge and tools to ensure that the legal requirements have been met. At least you have taken your family's safety into consideration and asked questions Didditmiself, as Leecat pointed out, there are a lot of factors to consider and scary stuff out there. The salesman at the supplier is just that, a salesman, not an electrician. He also does not know where and how you intend to use the installation. If the suppliers are interested in anything other than money, why is it so difficult to get 4pole isolators. They should be kept in stock yet when I ask for one I am given a blank stare "no-one uses them" is the reason given why it has to be ordered.
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