How does the ground box keep water out of the connection areas?
There are two main connection areas in the ground box. The first area is where the wires enter the box from the feed in the ground. These wires enter and connect inside a NEMA 6P (IP68) wiring enclosure — it has gasket seals and has been tested to perform under six feet of water for over 24 hours. The second area is in the cover. It has a diving bell (air pocket) design that traps air and maintains a constant air pressure — keeping water out of the connection area. It’s like turning an empty cup upside down and pushing it into a bucket of water — same concept.
If I have something plugged in and it starts raining, will the box be safe to use?
Yes, it will. The Legrand Outdoor Ground Box is the first “while in use” box on the market that is designed and UL listed to go into the ground and be safe to use even if unexpected weather moves in.
How does the box keep from filling up with water?
The box may fill with water — in fact, the box is designed to allow water to enter into it. Here’s the important part — it is also designed to keep water out of the connection areas with a NEMA 6P (IP68) wiring enclosure and the air pocket design.
Once the box fills up with water, how do you get the water out?
You don’t have to — a series of openings at the bottom of the ground box allow the water to drain out naturally through the ground.
Are there replacement parts for the box?
Yes, there are. If the cover is ever damaged, it can be replaced. We can also replace the egress doors, spring pins and cover plates.
Will the ground box leak if it cracks or breaks?
No. As long as the inner liner does not crack or break, the box will not lose its air pocket seal.
What is the standard warranty on this box?
The standard warranty is 1 year from installation or 2 years from point of purchase — whichever comes first.
What color options are available?
The ground box is offered in three colors — black, gray or brown.
Are there any other ground boxes on the market?
Yes, there are a few other boxes on the market. The Legrand Outdoor Ground Box is the only one rated NEMA 6P (IP68) — safe while in use. All of the other boxes are rated NEMA 3R in the closed un-activated position.
Can the ground box be installed inside?
Yes, it can — providing you follow the installation instructions and have proper drainage.
Are there concerns with the box withstanding frost heaves?
The Outdoor Ground Box was evaluated by a civil engineer and our installation recommendations are based on their analysis.
What is the maximum gauge wire that can be used in the ground box?
Due to NEC requirements, the maximum gauge wire that can be used in the ground box is a #6 gauge conductor.
If temperatures drop below freezing and water inside the ground box turns to ice, will it cause damage during expansion?
The box was subjected to the UL 2996 Icing Test and additional Legrand lab testing where it was cycled through intervals of freezing and thawing with no resulting damage, cracks, or breaks. SEE HERE
How do you connect the conduit to the bottom of the box and then connect the module?
Place a male fitting to the end of a PVC feed pipe and connect using the a lock nut tool. Visit the installation video page to SEE HOW IT’S DONE
Can the Outdoor Ground Box be installed on rooftops or underground parking structures?
Yes, the ground box can be installed in either location providing it is installed per the instructions- meaning, the box has to sit on gravel, allow for proper drainage, and the conduit feed must enter the box properly.
As long as the well system is under the box to allow drainage, can the box be encased in concrete around the outside (i.e. 2”, 4”)?
Yes, you can pour concrete around the box as long as you do not encase the entire ground box in concrete. The bottom of the box has to be allowed to drain through the weep holes.
How many 1¼” conduits feed the box?
There are two - one for feeding the box and the other to daisy chain to another box if needed.
How does the ground box stay level when the aggregate settles?
There are level requirements which can be found in the INSTRUCTION SHEET
and CUT SHEET
. As long as the instructions are followed and the ground is tamped properly, there will be no settling issues.
Are the egress doors susceptible to opening if you step on them when not populated- causing a trip hazard?
No, there are spring loaded pins that lock the egress door when the cover is in the closed position, with no cables exiting the box. The ground box meets the construction requirement from UL 2996; 5.4, stating that an in-ground box shall have a means of securing the cover in the closed position both when in use and when not in use.
Does the Outdoor Ground Box require GFCI protection?
Yes, per Article 250 of the NEC, all outdoor branch circuits require GFCI protection. The ground box does not provide a GFCI receptacle - one must be placed upstream to ensure that all live components are protected. The product is labeled with this requirement in compliance with UL 2996.
Does the ground box have a drainage pipe?
No, the box drains through a series of rectangular weep holes.