Junction boxes are usually laid out so that the circuit splices are located in the basement and in the attic. Attic junction boxes have to have a vertical clearance of three feet above it to make it legal.
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the height will depend on local building codes' requirements and also what time of outlet (ground, countertop for kitchen and bath, and ceiling such as in garage doors). Typically wall outlets are 16 inches on center from the finish floor.
The floor load in an overseas container is the amount of load the floor is capable of holding.
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While electric floor heating systems are great for heating, they generally fair poorly in cooling. Additionally, many contractors may not be familiar with an electric floor heating system setup.
I use a hammer from the floor to the bottom of the outlet. This equates to about 13". Usual construction specifications from the electrical engineers is 300mm or 12 inches to center of the device.