- Location
- Massachusetts
I have to disagree there.
In my opinion that is the wall switch or contactor, etc. used to control the fixture.
Time clock controlled outlets in pot growing operation
- Thread starter electrofelon
- Start date
- Status
I have to disagree there.
In my opinion that is the wall switch or contactor, etc. used to control the fixture.
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
Help me out here, brain is fuzzy.
Are you saying that a device used to control, not disconnect, a HID fixture must break all ungrounded conductors?
- Location
- Massachusetts
Yes, 'switching device' includes both the disconnecting means and the controler.
If they had only meant the 'disconnect' it would say disconnecting means.
Here is an example from Article 424 that demonstrates that concept.
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
But every pole light wired with L-L voltage with a twist lock photo cell that I have worked on breaks only one leg.
The internal quick connect breaks L-L for maintenance.
Last edited:
- Location
- Massachusetts
Last edited:
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
What does that have to do with what the NEC clearly requires?
So, it would be a case where a UL rated fixture can be wired that way, but I cannot field wire a fixture like that.
That's messed up.:rant:
hillbilly1
Senior Member
- Location
- North Georgia mountains
- Occupation
- Owner/electrical contractor
But that is part of the fixture, manufactures do not have to follow the NEC. I think the reasoning behind fixtures having both lines disconnected is if one or more ballasts fails, voltage and amperage could flow causing the other fixtures to try to operate at the lower voltage, provided it is a grounded system.
Here is a good question.
Does a 480 volt twist lock photocell switch two poles?
I just looked at the specs to many different brands and none of them say whether or not they do..:blink:
- Location
- Massachusetts
I think they all have only three prongs, hot, hot (or neutral) and switched hot.
Yup Two hots and a neutral.
Jumper raised a good point,,I supose you could just remove the photocell to open both hots.
Sorry my point just left my mind...:blink::lol:
hillbilly1
Senior Member
- Location
- North Georgia mountains
- Occupation
- Owner/electrical contractor
Removing the photocell does not remove both hots though, only power to the photocell and one hot to the fixture, the other hot is fed straight through to the ballast.
|
Doesn't that create a violation of 410.104(B) ?.
410.104(B) Switching. Where supplied by the ungrounded conductors
of a circuit, the switching device of auxiliary equipment
shall simultaneously disconnect all conductors.
hillbilly1
Senior Member
- Location
- North Georgia mountains
- Occupation
- Owner/electrical contractor
Not if its a listed part of the fixture. Manufactures are not governed by the NEC.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
Does not matter what product is grown, we already have equipment designed for the application of growing things for products that are not questionable. There alread are all kinds of commercial greenhouses growing many fruits, vegetables, and other plants for all kinds of purposes. Many of them already use automated control systems for heat, light, water, fertilizer, etc.
Agree 547 primarily applies to livestock buildings. For those that don't ever go into livestock operation buildings, they don't really understand what kind of conditions are encountered in those places. Here on this forum, horse barns is the application that seems to come up the most. Horse barns are actually a pretty mild environment compared to beef, swine or poultry operations, I have been in enough each of those types to put some of you to shame on any comments involving them especially when it comes to what really goes on in such installations. Code and practicality do not always get along in those buildings and you sometimes need to compromise. OTOH some of you have been into enough huge industrial plants to do the same to me.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
As I see it, this actually recognizes that the conditions do NOT apply to controllers unless that controller is also used to meet the disconnecting means requirement. I do not necessarily disagree with your point, but the code section you quoted does not support that point.
The section on lighting clearly refers to any switching device for a luminaire as having to disconnect all ungrounded wires. What is not clear to me from that is whether it applies to switches which are neither part of the luminaire itself nor manually operable.
mivey
Senior Member
Define auxiliary equipment 1st. Auxiliary equipment brings to mind things that are integral to the operation of the HID fixture like a ballast, capacitor, etc. Where does the code group a switch and/or contactor in with the fixture? It seems to me the contactor should be grouped with the switch instead.
mivey
Senior Member
I agree. I do not see the contactor as having to be the disconnect means.
- Location
- Massachusetts
You guys have lost me entirely.
I have not said the contactor must be the disconnecting means.
What I have said is that any switching device controling an HID fixture must open all ungrounded conductors.
A switching device could be a wall switch, a contactor, a safety switch etc.
- Location
- Massachusetts
I have absolutely no idea what you are trying to say.
The contactor is not aux equipment, I never said it was.
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
Most of the lighting is LED, however there is some HID lighting. I have always had this philosophy that the NEC sort of ends at a receptacle. I am open to some code references or precedents on this, but can someone violate the NEC by plugging in a UL listed device into an outlet? The example in this thread is having 250v outlet with one pole switched. If that itself is not a violation, can it become a violation depending on what I plug into it? Is it a violation for someone to plug a light into their small appliance circuit?
- Status