Comply with standards: Follow NEC, IEC, or local codes. Use UL/CE-certified parts and record installation details for future inspections. Schedule regular maintenance and inspections to ensure long-term reliability. Electricians without relevant knowledge shall not dismantle the distribution box. No sundries shall be piled around the distribution box, whether the metal fence is damaged, and whether the protective ground wire of the metal fence is firmly crimped. Check whether the contact of switch and. Strictly speaking, the word “Distribution Box (D-box)” can refer to two categories: electrical distribution boxes and septic tank distribution boxes.