Grow Lighting on 30A circuit

[Machiavelli999]

I am being asked if I can put 1000W grow lights such as this: https://gavita.com/retail/products/gavita-pro-line-classic/gavita-pro-1000-de/

..on a 30A circuit, instead of 20A. These are cord & plug connected units. And each plug is rated for just 20A. I was going to say no and insist on providing 20A circuits, but I did find NEC 410.62(C)(2) which states:

(C) Electric-Discharge and LED Luminaires.
(2) Provided with Mogul-Base, Screw Shell Lampholders.
Electric-discharge luminaires provided with mogulbase,
screw shell lampholders shall be permitted to be connected
to branch circuits of 50 amperes or less by cords
complying with 240.5. Receptacles and attachment plugs
shall be permitted to be of a lower ampere rating than the
branch circuit but not less than 125 percent of the luminaire
full-load current.


Seems like it's allowed. But what is a mogul-base, screw shell lampholder? Is that just the standard lampholder? Or some special kind?

 

[Greentagger]

Mogul base screw shell is an oversized lamp holder. Probably three times as big as the average ones noted in regular incandescent screw shells.

 

[infinity]

I agree with GT, the fixtures in your link are not mogul base.

 

[augie47]

From the data sheet the power cord is an accessory.
If you wish to hard wire them with a whip I believe there are provisions to put them on the 30 amp circuit under 210.19

 

[winnie]

From the data sheet the power cord is an accessory.
If you wish to hard wire them with a whip I believe there are provisions to put them on the 30 amp circuit under 210.19

Hmm. The power cord is an accessory but it goes to an inlet on the device. You can _change_ the power cord but I don't think you can eliminate it.

To the OP, note the current inrush ratings of these lamps. Whatever you use to control the lamps needs to tolerate this inrush current.

Will these lamps be wired to a 240V L-L single phase supply or a 416/240V 3 phase supply?

-Jon

 

[LarryFine]

Seems like it's allowed. But what is a mogul-base, screw shell lampholder? Is that just the standard lampholder? Or some special kind?

A mogul-based bulb is about 1.5 times the diameter of an Edison-based bulb, and is the base of a typical MV/HPS bulb: