What I was envisioning from the OP's post was an area possibly chain fenced off in the production room (based on "in the factory environment"). Heck to the no. Outside the production room is a must IMO, because I don't want the guy who just governed his overalls in oil to have to walk the production floor for a bathroom break.
No, in all of my many years in the UK food industry, I've never seen that. I doubt that was what was meant. That said, most engineering teams have a room just off plant in most areas. So for example, in high care or high risk they may not have one or if they do it's for assembly only, no lubrication, no cutting, no welding. In low risk, they will have one and it will have change coats or over clothing for cutting and grinding. I've never seen an engineer cover themselves in oil despite knowing some extremely incompetent ones. But these engineers normally have distinctive clothing to operators. So yes, it's theoretically possible if they did cover themselves in oil to need to go out via low risk production. Although if it was really bad, I'd expect them to go straight out of the fire door and potentially to an emergency shower. I don't see a massive risk in it. If your engineers are that dirty then it might be some time for a bit of training...
Some sites also have an out of production area away from the main plant but this normally necessitates equipment going fully outside then back in. Not ideal either. Places which have this normally only use it for storage of parts and delivery and assembly of new equipment. But I've had some micro nightmares due to situations like this.
Edited by GMO, Today, 06:21 AM.