Step 1: Parts list
My parts were bought and scrounged from other things.
2x receptacle's. this is where the grade and quality comes in. I used hospital grade 20 amp plugs with integrated surge protection and GFI protection on the circuit as well. Scored from ebay for 19 bucks each.
Wire......again pick and chose, something good quality that's meant for use as a portable appliance cord. i used a cord from a 800watt stage spotlight, over kill but heat resistant and uses 12 gauge wire.
(make sure to save a few pieces for jumpers between your plugs, about 6 inches. )
Male Plug - I used a hospital grade 20 amp plug, found in my parts bin. Shop around, home depot would have a basic version of this. Ebay if you want a nice hospital or audio grade plug. Make sure you get one that has the ground plug on it.
Box - I used a dual gang outdoor box with a 3/4" non threaded fitting.
Through tight vapor fitting.....not essential but acts as strain relief. Will be found in the home depot isle close to the box. NOTE: you will also need glue to attach it, your supposed to use pvc glue, but being that its not going outside i just used gorilla glue and its never coming outa there so im not worried about it.
Cover pate.. plastic, metal, whatever you want, i used stainless steel, was the most expensive one there but it looks nice when its all done.
Tools, wire cutters, strippers, and a few screwdrivers.
Step 2: Assembly of the plug.
- Strip one end of your chose cords cover off and strip about 1 cm of cord and curl it into a loop and attach your hot , neutral and ground to the cord cap and crew the cover on.
Sorry for the lack of pictures, mine was already assembled , i found it in the parts box , but there are sites that will explain this in greater detail if you need it.
-next feed the through tight fitting nut over the end of the wire followed by the rubber gasket and insert the end into the fitting on the box.
Don't tighten it down yet as you will need the slack to attach the wires to the plugs.
Step 3: Wiring
Because i am using one GFCI (ground fault circuit interrupter) i am going to feed the second plug through the first one.
Make sure that you put that hot wire, ( if you wired you male plug right this should be the black one) on the hot line side of the plug. On the gfci its labeled on the bottom of the plug hot and white.
The line side means the side of the plug that your power comes into , so from the wall. On most plugs the hot screw is discolored making it visible and therefore less likely to be mistakenly connected in reverse.
The white wire, or the neutral will be attached to the white side or the side with the silver screw.
Hooking these up backwards is not a good thing, hot neutrals can cause shocks and can be dangerous. However some houses are wired wrong and sometimes just cant be helped.
The Load side on the gfci as seen in the picture will be attached to the second plug, in this case the TSS ( transient surge suppressor)
Ground - The gfci has a ground screw , and the second plug as a built in ground wire. Because its not permissible to attach two wires to the ground screw were going to attach the plug ground to the gfci , the box's ground terminal will be attached the second plug and the two will be bonded together by the metal strip shown in the picture
Step 4: Final assembly
Line your receptacles up with the box and pull the cord out till its taunt getting any slack wire out of the inside of the box.
Tighten the screws of the plugs down till they are flat and the plugs are level with each other. you may have to loosen them later to adjust the position of the plug slightly to ensure a proper fit of the cover plate.
finally push the rubber gasket up to the bottom of the fitting and tighten the plastic nut onto the box.
Lastly , attach the cover plate and test.
Note: With the gfci it is shipped in the off or test tripped position. which meant you will have to push the reset button once you have the power connected. in my case i got two green lights on the box.