[Roller Shutter 1 Or 2 Contacts?]

I was wondering is there any regs reguarding when a roller shutter is wide enough to need a contact on both sides? I have a job starting soon and the R/Shutters are about 3.3m wide.

Over 6 feet wide, 2 Contacts. Measurement gives age of advice but holds well. Not nice to see door wedged open other side to contact and access gained by undesireables.