Usually double sockets at 10 amp single phase, work with your electrical system designer to ensure you have both general coverage around the house for items such as vacuum cleaners - as well as task outlets for items such as a free-standing lamp or appliances. 

Be sure to let your designer know if you have any special requirements - such as grinders in the workshop, or extra points in the bathroom so you can plug in the straightening tongs and hairdryer without having to unplug the electric toothbrush every time!

Devices such as Audio equipment should have their own circuits and connected equipment such as projectors or subwoofers should be looped from the same circuit. 

Failure to plan for this in the design stage can mean your AV system winds up carrying earth potential imbalances for your electrical system and this appears as a 50 cycle buzz on the audio system or slowly scrolling wide dark band on your display equipment.

Some devices require permanent connection such as the heated towel rail, your designer will advise you on where these are required. Items that are commonly controlled by a lighting and automation system are fans, towel rails, heated mirror pads, louvres etc. make sure you decide which devices you would like controlled by the system so they can be wired back to the control system.

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