Is it OK to Install Fire Alarm Cable underground?
|Post Indicator Valve with Fire Department Connection|
Direct Burial Cable as an Alternate to Conduit
|Backfloe Preventor with OS$Y Switches for Fire Alarm|
Junction boxes that are run out into the middle of a remote area without an anchor point must have the schedule 80 PVC embedded in the concrete to support the box. Another method is to attach the box to a post that is either driven or buried in the ground 18" and connects directly to the schedule 80 PVC conduit. Junction boxes should be installed at least 12" above grade but not more than 18" for the unattached method.
See also conduit bending videos.
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