Check the electrical load and ensure that the sensors do not exceed the 10 Amp maximum. Let's walk through how to diagnose and fix this common issue step-by-step. A septic distribution box (D-box) is a concrete or plastic junction that evenly distributes wastewater from your septic tank to all drainfield lateral lines. These can range from minor details to major safety defects. If your inspection report contains some of these, don't be alarmed; we are very picky, and many of the issues addressed here are common practice, if. The switches or circuit breakers can be mounted in a single enclosure, in a group of separate enclosures, or in a switchboard or switchgear.