(7/1/2015) This article has been moved to a new site. As part of the move, I've tried to update with the latest hardware info where it applies but the picture will take more time to update. Today our housings look slightly different and the pre-punched back plate ships with the necessary screws in the packaging, no extra, loose screws are shipped.
In addition to the back of the enclosure, we also use the epoxy to secure the plug on the spare end. Epoxy is lightly applied on the threads going all the way around in an effort to obtain a water tight seal.
Once the epoxy is applied, the next step is to secure the back plate to the enclosure using the supplied screws. Do not over tighten, but make sure they are good and secure. Once this is secure it’s a good idea to go to the inside of the enclosure and apply a bead of epoxy where the plate and enclosure meet. We apply what may resemble caulking the seam as an additional means to secure and seal.
On the element end, we will again remove the outer insulation, but this time about 6 inches worth. Again, secure the braided poly with a light amount of electrical tape. If you use a light enough amount, the combination of the cord grip and the tape will keep the braided poly secure, and again you won't need the included heat shrink.
The biggest advantage to avoiding the use of the heat shrink will be the flexibility the cable will have. The heat shrink will come across as rather rigid.
Install the plug on the end and once its on, proceed to disassemble the cord grip, or at the very least loosen it up as much as possible without disassembling. The cord grip will slide on to the cable, with the bare threads going the direction of the end of the wire. After you slide the cord grip on, feed the cable through the available hole on the aluminum enclosure and then slide the cord grip down and secure. If you taped the braided poly right you should be able to tighten the cord grip into the enclosure and then secure the poly and cable into grip by tightening the outer ring to its fullest. This will give you a secure, water tight connection.