When should I choose a non-interlock electric release preaction system for code compliance?
A non-interlock electric release preaction Integrated Fire Protection System opens when detection operates or when sprinkler piping loses supervisory air pressure. It is typically chosen when faster water admission is preferred over the added security of double interlock logic.
Choose non-interlock electric release when you want preaction protection with detection input, but you also want the system to operate if the sprinkler piping opens before detection completes the release sequence.
What the option means
In a non-interlock electric release arrangement, the releasing panel controls a solenoid valve. When detection satisfies the release condition, the valve opens and the system fills with water. FireFlex documentation also notes that opening of the sprinkler piping can open the deluge valve.
When to choose it
- the hazard benefits from preaction protection,
- detection is available,
- faster transition to water-filled piping is preferred,
- the design does not require double confirmation before water enters the piping.
When not to choose it
Do not choose it when the owner or designer wants the highest protection against accidental water entry into the sprinkler piping. In that case, a double interlock arrangement is often the better fit.
Compliance point
This option must still be paired with a listed releasing control panel and compatible detection system, and the full installation must follow the applicable code and manufacturer limitations.
Frequently Asked Questions
Is non-interlock the same as dry pipe?
No. It is a preaction arrangement with electric release logic, although some configurations can still operate in a dry-system-like mode if release does not occur.
Does detection have to be provided?
Yes. FireFlex documentation states it is controlled by an approved releasing control panel with compatible detection.
Is this a good choice for water-sensitive spaces?
It can be, but single or double interlock may be preferred when accidental water entry must be minimized further.
Technical references used
TOTALPAC 3 non-interlock electric release datasheet; TOTALPAC N2 non-interlock electric release datasheet.