Fire Alarm EOL

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In a food processing facility they want the bottom 10 feet able to be hosed down for cleanup, so the owner is thinking we should replace metal boxes with PVC. I believe that PVC is allowed in combustible Buildings now, but this Building is a Concrete Tilt Up(non-combustible)
 
I don't know of a fire alarm code reason why you couldn't do that. Someone else might be able to answer your question about the PVC box being allowed in that building.

I know from experience that pretty much any weatherproof box below 10 feet in a food processing area will get hit with high pressure water spray. The gaskets on those boxes are not designed for high pressure. The water will get in the box and cannot drain back out. Eventually you will start getting ground faults on the fire alarm control panel due to water.
 
weressl said:
Hm... the ones I've seen the EOL is installed on the last device's terminals, not requiring a separate box.
Click to expand...

Most of the time the EOLR is installed at the last device. The very old wire wound 120VAC end of line resistors had a separate box because of their size. I've seen some specifications call for a separate box for the modern resistors.

Here is an example of one way it's done, but it won't help in the OPs situation:
MP-300 EOL Resistor Plate
 
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