[Shaun Colley]

Hi Matt,

We have removed our UG subs but when we were working in them, we had a dedicated safety observer monitoring the atmosphere at all times including a period of time prior to entry, a tripod removal system for rescue, harness and full general PPE (safety glasses, safety boots, full cover 8cal overalls, safety hard hat, gloves suitable for the tasks undertaken, and non-synthetic undergarments).
Our subs had internal extractor fans, so these were on at all times prior to and during entry.
A confined space permit was also in force for the duration of the entry.

Any other works were case by case with site specific arc flash calcs undertaken/provided by the asset management/engineering team.

Can get you specifics for equipment etc if required 🙂

Regards Shaun