I can’t tell you how many times I have had to replace an entire main panel (and sometimes more), just for want of a little bit of caulk. Depending on the cable and conductor routing, the water damage can have devastating effects.
Inside the main panel, typically situated below the meter box and in a basement, the service cable, having had its outer sheathing stripped to allow the conductors within to be connected to the main breaker and neutral bar, allows the water to drip inside the panel box. In any event, water enters the meter box through this point and then, because of how the connections are arranged inside the meter box, the water, guided by gravity, follows the load-side conductors down and out of the meter box, traveling inside the service entrance cable. However, this sealant dries out and cracks over time, or in many instances, no sealant was ever used.
Traditionally, installers have used a compound called duct seal. For this reason, it is required that installers seal the top of that connector. This is mainly due to slight differences in riser cable dimensions from different manufacturers. The problem of course, is that the connector is often not rain tight. Under these circumstances, the electrical service riser cable that comes down the side of the house typically enters the top of the meter box through a so-called rain tight connector. This circumstance occurs when a customer has an overhead service, as opposed to an underground service, and when the meter box is on the outside of the house. It can be mystifying for a homeowner unfamiliar with the inner workings of their panel box or meter box how this can occur but it’s quite simple and predictable (and as easily prevented).
#Electrical putty waterproof professional
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