NYC Pre-Action System

[mstrlucky74]

Anyone know if they have to be in RGS conduit by NYC code?

 

[hbiss]

Ok, what's a Pre-Action system?

-Hal

 

[ron]

Ok, what's a Pre-Action system?

-Hal

A type of sprinkler system that has supervisory air in the pipe and only allows water to flow into the pipe when the proper conditions activate, either detection (single interlock) OR detection & air exits the pipe (double interlock).

NYC only allows single interlock.

 

[ron]

Anyone know if they have to be in RGS conduit by NYC code?

Yes, sort of but not exactly. You have a few other choices too. See NYC Electric Code Section 760.131(B) https://www1.nyc.gov/assets/buildings/pdf/ll39of2011_electrical_code.pdf

 

[mstrlucky74]

Yes, sort of but not exactly. You have a few other choices too. See NYC Electric Code Section 760.131(B) https://www1.nyc.gov/assets/buildings/pdf/ll39of2011_electrical_code.pdf

Thanks

Sent from my SM-N960U using Tapatalk

 

[hbiss]

A type of sprinkler system that has supervisory air in the pipe and only allows water to flow into the pipe when the proper conditions activate, either detection (single interlock) OR detection & air exits the pipe (double interlock).

NYC only allows single interlock.

Commonly called a dry system. There is an air compressor that keeps the piping charged with air.

-Hal

 

[ron]

Commonly called a dry system. There is an air compressor that keeps the piping charged with air.

-Hal

Probably not worth arm wrestling about, but NFPA 13 defines them differently. Although pre-action systems normally have dry pipes in the protected area, it is different than a dry pipe system. A Pre-action system requires detection to activate.

Technically there is such a thing as a non-interlock pre-action system that is essentially a dry pipe system, but nobody really goes through that listing process when a cheapo dry pipe system listing is easier and cheaper to get.