Discuss Joe's answer to: Can fire sprinkler systems work while the main water valve is shut off? How can you tell if the system if pressurized? Are gauges standard?

Can fire sprinklers work while the main water valve is shut off? How can you tell if the system is pressurized? Are pressure gauges standard?

So I'm at a commerical plaza in Las Vegas.We have one main water shut off valve to each building.HOA says we are on a loop system, does that mean the main shut off valve works more domestic water and the fire line water?

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