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#222308 08/17/23 04:47 AM
Joined: Jan 2005
Posts: 5,476
Likes: 3
Cat Servant
Member
Pictured is a four-square box with every knock-out removed. I often find this when the box mounts a control transformer for HVAC work. Within the box is a 120-volt line supplying power to the transformer; outside the box thermostat wires are connected to the transformer output.

I see this so often it can’t be a fluke. Just what are the installers trying to accomplish?

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Joined: Apr 2002
Posts: 7,411
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Previously owned (used) boxes??
Ventilation?
HVAC guys not knowing what they are doing?


John
Joined: Oct 2000
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My guess ventilation.


Bill
Joined: Jul 2004
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G
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Originally Posted by Bill Addiss
My guess ventilation.

Yeah, let that fire in the box breathe wink


Greg Fretwell
Joined: Jan 2005
Posts: 5,476
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Cat Servant
Member
Yeah, these boxes have always puzzled me.
First, I see them so often that I don’t think it’s random chance. Surely the HVAC trade isn’t THAT boring. Maybe it’s just a way they have of disposing the “oops” boxes, where they removed the wrong KO.
My first thoughts went to “ventilation,” but there’s nothing inside to ventilate! The one thing that might get warm — a box-mounted control transformer — hangs outside the box.

Joined: Jul 2004
Posts: 10,006
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G
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HVAC folks are a strange breed. It may be the most sequestered trade. When my wife was banging out houses as fast as they could be built, stacking trades was common but nobody wanted to be there when the HVAC guys had the house.


Greg Fretwell
Joined: Apr 2002
Posts: 7,411
Likes: 8
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Reno:

I think that removing 12 KOs is a really bad 'ooops'

No one can be that bad.


John
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N
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Somebody is bored?


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