Insulating a stud wall with existing electrical cabling

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I'm currently renovating a my new home which is a late Victorian house, and I've taken plaster off a couple of stud walls in my office. With in the room, there are currently (The house was rewired around 7 years ago).
  • 1 Run of 1.5mm T + E for the lighting Circuit (running from floor to ceiling ~2.7m run)
  • 1 Run of 1.5mm for the light switch
  • 2 x sockets with 2.5mm T + E at 45cm height
I'm wanting to add some sound insulation to these walls, but I understand this will derate the cable if the insulation surrounds the cabling. What is the correct method to deal with it, it leaving some spacing around the wires (if so how much?) or using conduit the correct approach here?
 
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The 1.5mm for the lights is well over rated anyway so you don't have to worry about that. Not so sure about the 2.5mm. Someone will be along shortly no doubt to tell you.
 
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