I will install a receptacle next to a tree. I know it must be protected by a GFCI and weatherproof. But my concern is about how to support it and how high it should be from the ground.
Where in the NEC is the information about these requirements?
What NEC requirements apply to installing receptacle next to a tree
code-complianceoutdoorreceptacle
Related Solutions
Yes, you are right. Current code wants the dishwasher GFCI protected. However, unlike the dishwasher, there is no specific article that explicitly states a disposal requires one.
A Double pole GFCI 20 Amp breaker can protect two individual appliances. The Wiring is known as a MWBC "multi-wire branch circuit" and uses 12-3 "Black, Red, White, and Ground".
However, current code also wants everything in a kitchen, including dishwashers to be ARC-fault protected. One solution is to use a Double-Pole Dual GFCI/ARC fault 20 Amp breaker.
But since you ran two separate branch circuits I don't think code allows you to combine the neutrals as one in the panel because the conductors are not in the same sheath/raceway when they leave the panel. In which case, you would just do as you mentioned using a 2-gang box with one GFCI and one regular outlet, which is probably far way less expensive!
The transformer in that kit is designed for outdoor use, the cord plug should be protected with an "in-use" type receptacle cover.
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Best Answer
The most important code sections to be aware of when installing outdoor receptacles, are 314.15, 314.23, and 406.8(B)(1).
First off, the box should keep water out.
Secondly, the cover should also keep water out even when things are connected.
Lastly, you'll want to make sure the thing isn't laying in the mud. Depending on the Authority Having Jurisdiction (AHJ), you might get away with attaching the box directly to the tree, or supporting it with the conduit used to supply it. The proper way to do it, however, would be according to 314.23 (B). Use a stake.
Common sense says you should install the box up out of puddles, and if you get snow in your area above the normal snow level. There are no code sections that deal with the height above grade, so use your best judgement. And never forget the most important code section of all...