I would keep them in separate channels. If ever the gas pipe has to be repaired then the cable will be in the way, and same goes for future replacement of the cable.
I expect someone will be able to advise better than I can but with regard to what I said 528-02-04 works for me
"Where a wiring system is to be installed in proximity to a non electrical service it shall be so arranged that any forseeable operation carried out on either service will not cause damage to the other"
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local