Garage exhaust and lighting control box

[BreeStephany]

View media item 108647
View media item 108648
View media item 108649
View media item 108650
Recently wired up a control jbox for controlling the exhaust fans and lighting in a garage on a project I am working on. I admit this isn't the cleanest job I have ever done, but am pretty happy with how it turned out.

The lighting is controlled by an occupancy sensor and can be overridden by a switch in-line on the load side.

The smaller of two exhaust fans in the garage is to be constantly on, however, I felt it important to pass the circuit through the control box just in case they ever change their minds on how to control the fan, as it will allow changes in control to be accomplished quickly and easily.

The larger of the two exhaust fans is controlled by a hand/auto switch which then leads directly to the fan SL for hand and through a low voltage controlled powerpack which is controlled by a NO2/CO detector in the garage.

I am not the biggest fan of having both low voltage and high voltage in the same enclosure without a physical barrier / separation, but do believe it is compliant with NEC Section 725-54(a)(1), Exception No. 2 as the line voltage in the enclosure is all 125V for all circuits. Regardless, I tried to keep as much separation on the internal wiring as possible between the two systems.

Working in the trades for a few years now, I absolutely hate opening up control boxes and having to figure out what circuits are what and what exactly they control so I made sure to well label both the low and high voltage wiring and wireways in the junction box and will be putting a vinyl printed line diagram of the control on the inside of the cover to make things easier on the next person that might have to open it up for whatever reason.

Would love the input of the good people of Garage Journal and always appreciate input on how to better my work.

 

[Bert_]

Diagrams are good. I admit I'm not good about leaving diagrams when I wire a control panel. I always do label all the starters at least.

 

[Terry D]

Very nice job

Sent from my SM-G960U using The Garage Journal mobile app

 

[nadogail]

Your work looks very good to me.

 

[wssix99]

Nice job.

I have a similar setup (except all 120V) but drive the fans off of the garage lighting. I was able to use ASHRAE formulas to confirm that running the fans off of my automatic garage door lights would evacuate any accumulated CO, so was able to avoid any other ventilation or CO detectors.)

Here's my setup. https://www.garagejournal.com/forum/showpost.php?p=5429850&postcount=39 I highly recommend adding indicator lights if it's not too late. They are really handy for telling if things are running because one of the door timers is commanding the circuit on or if its on because I have a wall switch thrown.

 

[BreeStephany]

Nice job.

I have a similar setup (except all 120V) but drive the fans off of the garage lighting. I was able to use ASHRAE formulas to confirm that running the fans off of my automatic garage door lights would evacuate any accumulated CO, so was able to avoid any other ventilation or CO detectors.)

Here's my setup. https://www.garagejournal.com/forum/showpost.php?p=5429850&postcount=39 I highly recommend adding indicator lights if it's not too late. They are really handy for telling if things are running because one of the door timers is commanding the circuit on or if its on because I have a wall switch thrown.

The contactor is actually located above a drop ceiling in the hallway outside of the garage area, so indicators probably wouldn't be of much use, as no one, outside of the electricians or HVAC techs, would check above the ceiling if there were issues.

In other control cabinets, like ones located in electrical rooms or control rooms, indicator lights are DEFINITELY of a good use.

Just my two cents.