Examine the insulation of the auxiliary wire. In case it's required, grease the. An MCB Distribution Box (DB) is the heart of any electrical installation—whether residential, commercial, or industrial. While MCBs are designed for reliability, the distribution box itself requires. Maintain Low Voltage Distribution Boxes with regular inspection, cleaning, and preventive care to ensure safety, reliability, and longer service life. This should include commonly needed items such as fuses, circuit breakers, and control components specific to your distribution box configuration. Inspect for any physical damage to the enclosure.