Don't listen to the others, that looks great. Just don't leave the Commando joint or the charger brick on the ground where they could sit in water.Whats am interlock? A switch? I wondered that but its got trip switches now so maybe just a little tingle!
Here are my leads and granny. not that happy with the granny it seems a little light and cheap but it seems to work well and goes up to 16 amps.
My extension is a 25m 2.5mm cable! Sure is a heavy beast!
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An interlocked outlet is one with a switch that can only be live with a plug in it. Mainly needed where you have children or stupid people around, so essential for me.