Air curtain plunger door switch

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sw_ross

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I installed 3 air curtains at a business. These air curtains came with a door plunger switch to turn the air curtain on when the door is open.

The plunger switch is mounted on the door frame which is steel framed, and operates at line voltage.
Nothing in the instructions say anything about bonding the door frame. My thinking is that if something happened and the metal frame became energized due to the switch there would be no way for the fault current to return to the source and trip the OCPD.

Any thoughts? I might go ahead and install a bonding strap between the door frame and the air curtain for peace of mind.
 
sw_ross said:
The plunger switch is mounted on the door frame which is steel framed, and operates at line voltage.
Nothing in the instructions say anything about bonding the door frame. My thinking is that if something happened and the metal frame became energized due to the switch there would be no way for the fault current to return to the source and trip the OCPD.
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There is no EGC or metallic conduit with the switch wiring?
 
No. The switch is an enclosed plastic case that has a small sized SO cord connector. It has 3 terminals, Common, NO, and NC. It mounts to the frame with 2 screws that go through the frame of the switch.
 
How about the air curtain mechanism itself? I assume it's also powered, and grounded. Is it fastened to the door frame with metal connecting parts?

Are you sure the switch doesn't activate a relay in the air curtain controls?
 
That air curtain mounts above the door. It doesn't physically mount to the door frame. It has a factory installed cord & plug. I installed receptacles for each air curtain.

The door switch came with the unit. Instructions show mounting the switch on door frame and running a cord into the unit, instructing where to enter the unit, then using the NC terminal. It then shows a diagram on how to splice the switch wires into the factory wires in the unit (basically inserting the switch into the power supply cord).

Doesn't say anything about bonding anywhere in the instructions.

It doesn't say what size or type of wire to use, which surprised me. I could see a maintenance guy trying to install it and using t-stat wire because it's "what I had handy"!

The unit's are rated for 0.38 kW, a little over 3 amps.
 
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