hhsting
Senior Member
- Location
- Glen bunie, md, us
- Occupation
- Junior plan reviewer
110.26(d) says illumination shall not be control by auto means only. If i have digital override dimmer switch then would that be acceptable?
110.26(d)
- Thread starter hhsting
- Start date
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hhsting
Senior Member
- Location
- Glen bunie, md, us
- Occupation
- Junior plan reviewer
Right but override is digital not manual
Carultch
Senior Member
- Location
- Massachusetts
It needs to have a manual way to override the control. We don't want to put anyone working on the equipment in the dark, after a motion sensor fails to detect them, or an automatic timer turns off.
hhsting
Senior Member
- Location
- Glen bunie, md, us
- Occupation
- Junior plan reviewer
Their is an override switch but its digital you know touch screen instead of manual override switch. I just dont see the word manual in 110.26(D)
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Why would you want to use a dimmer. I believe the building code may require a certain amount of lumens. Not sure about that but it is a bad idea in my opinion.
kwired
Electron manager
- Location
- NE Nebraska
Does "override" remain on indefinitely or does it just add a delay until it turns off? Delay until it turns off is still somewhat automatic control, you don't want to be in a potentially hazardous situation then the lights automatically turn off because the override timed out.
hhsting
Senior Member
- Location
- Glen bunie, md, us
- Occupation
- Junior plan reviewer
Well I thought 110.26(d) means you can have override switch and occupancy sensor. If you override it light come on but then can come off if no one is in the room???
hhsting
Senior Member
- Location
- Glen bunie, md, us
- Occupation
- Junior plan reviewer
Designer does its on plans. Panelboard is in billing office of doctor office
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
So does this digital timer also turn lights on automatically?
Regardless I would tell the designer forget it. Stupid idea imo
Regardless I would tell the designer forget it. Stupid idea imo
If you have to operate something to get it to work, that is manual control. Your digital switch is a manual switch if you can push a button (or touch a touchscreen) to get it to do something.
- Location
- Illinois
- Occupation
- retired electrician
The language is poor in the section, but the intent is that the lights cannot be automatically shut off.
The language in the 2020 code says:
The language in the 2020 code says:
kwired
Electron manager
- Location
- NE Nebraska
separate totally manual switch to bypass the automatic control does satisfy the requirement. Might clash with energy code if it doesn't return to automatic control, automatically - now you have a dilemma which code to comply with, but for safety reasons you still don't want the lights going out on you while doing certain tasks or equipment is in certain conditions.
- Location
- Illinois
- Occupation
- retired electrician
That would get a red tag from me.
The occupancy sensors do not always do a good job of detecting people, especially if they are not moving very much, and that might cause the lights to go out while someone is working on the equipment. That can be very dangerous if the person is doing troubleshooting or other permitted work on energized equipment.
kwired
Electron manager
- Location
- NE Nebraska
On top of that there still might be dead spots in the area where it won't detect occupancy.
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