What Do I Need For EX/ Hazardous Rated Cable?

Hi Guys

Was wondering if anyone has experience of EX areas . I have a project that requires EX cameras and Security Equipment. The choice of Equipment is straightforward. The grey area is what type of cables to use within these EX areas.

I have contacted different Cable Manufacturer's for advise. The advise given has ranged from

1. Don't Know

2. Standard cable ( Beldon 9504 Etc)

3. Screened cable with a specific gel within the insulation . This prevents a spark travelling through the cable if cut or damaged.

As you can see it's very vague

Thanks

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