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Installing Spa-Side Controls Properly
This spa-side switch is mounted too low - in violation of manufacturer recommendations - and is immersed even when the spa is off. Moreover, the back of the unit wasn't properly sealed, and as a result, water flowed back into the electrical panel.
The installation manuals for these spa-side units spell out where these panels should be installed, whether inside the spa near and above the waterline or on the deck within arm’s reach of the spa. The manuals make it very clear that manufacturers don’t want the panels installed at or below the waterline. Even though these units are designated as waterproof and getting soaked is not a problem, their suppliers generally want them to stay reasonably high and dry. These units are typically connected to a threaded PVC pipe through which the wires pass back to the main panel at the equipment pad. This back connection should be sealed with silicon sealing compound — all very simple and straightforward.
The Scenario: I was called onto a project as a representative of California’s Contractors State License Board to inspect a situation where the pool was leaking every time the spa was activated. The raised spa was located about two feet above the pool’s surface and about the same two to three feet above the equipment pad.
When the spa was turned on, the water level in the vessel would rise slightly, partially covering a spa-side control panel mounted at the tile line. At the same time, the water level in the pool would drop. We quickly discovered that water was flowing into the conduit line and then flooding the bottom of the electrical panel — never a good idea.
Another consequence of this particularly poor spa-side switch installation is that water was able to migrate from the point of the leak and made its way all the way around to flow out through the dam wall, where the slow leaking resulted in an unsightly mineral build-up.
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Scott Cohen is president and supervising designer of The Green Scene, an outdoor design and construction firm based in Northridge, CA. He provides consultation for clients nationwide and gives seminars on designing landscapes, swimming pools and outdoor kitchens.