Routing bonding conductors

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Surely any cabling run outside should be mechanically protected in some way- in this case - conduit :?:
 
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I recall the 16th OSG indicates...
- 10mm insulated IF mechanically protected (conduit)
- 16mm insulated if NOT mechanically protected
- 25mm bare if NOT insulated + NOT mechanically protected

DNO can impose their own size requirements.

I recall the 17th has changed this area slightly.
 
IMO mini-trunking looks better.

You can also paint it (non-drip glosss) to blend in

paint BEFORE fitting or you will get smudges on the brickwork.
 
Another vote for pvc conduit here, preferably black so it doesn't stand out as much.
 

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