What are Cable Zones?

Earlier in the week I was asked a question by another tradesman, a tiler to be precise… the question was… "shouldn’t that cable be put into conduit to protect it? Won’t someone get electrocuted if they put a nail or screw through it?" From this, it was clear that he clearly didn’t know about cable zones and why RCDs are some important, especially when creating any new circuits or electrical work in certain areas of a home… READ ON:

Firstly, all electrical cables should be in “zones” - why? So that YOU know where they are in the walls and therefore won’t drill or nail into them! So, directly above a socket or switch, below, to the right or to the left. Usually, if you look closely enough, sockets will be the same height in a room, so it’s likely the cables will be running to the left or right of the socket, or directly below or above… cables should never run diagonally across a room. So, if you plan to hang a picture… check there isn’t a socket directly below or above or at the same height you plan to hang that picture! 

In the image below you can see an example of what not to do... as you can see the light switch is where you'd expect to find it, however when I started working on this it became clear that the cable was running from the switch and then diagonally running up to the light.

To Sum Up:

Cable zones are important to be aware of because they help ensure safety, efficiency, and compliance when installing, modifying, or maintaining electrical cabling. Here’s why they matter:

1. Safety

• Avoids accidental damage: Knowing where cables are routed prevents drilling or cutting into them when making modifications to walls, floors, or ceilings

• Reduces electrical hazards: Damaged cables can lead to electric shocks, fires, or short circuits

  
  

2. Compliance with Regulations

• Building & standards: All wiring in the UK follows the BS7671 Wiring Regulations that define where cables must be placed to minimise risks

• Legal responsibility: Incorrect cable placement could lead to failed inspections or liability issues

  
  

3. Ease of Maintenance & Future Modifications

• Predictable locations: If cables are installed in designated zones, electricians and contractors can quickly locate and service them

• Prevents unnecessary disruptions: Knowing where cables are prevents excessive opening of walls or ceilings to locate or repair wiring

  
  

4. Aesthetics & Functionality

• Minimises visible cabling: Keeping cables within proper zones helps maintain a clean, professional appearance

• Prevents interference: Properly zoned data cables reduce interference from electrical wiring, improving performance

Never drill or add a nail to the left or right of a socket or light fixture!

I am Richard Speller, and I am the Director and Owner of Speller's Sparks LTD (Electrical Services) - I am a Which? Trusted Trader, and member of NAPIT.

If you need any electrical work, or have any queries, please do call Rich now on 01761 325 007 or email info@spellerssparks.co.uk