Faulty or inadequate grounding can cause dangerous electrical shock hazards, equipment failure, and system instability. How to Identify: If you notice frequent tripping of ground fault circuit interrupters (GFCIs) or unusual electrical behavior, the issue may stem from improper. Poor grounding Grounding is an important measure to ensure electrical safety. If the distribution box is poorly grounded, it may cause electrical system leakage, short circuit and other faults, and even cause electric shock accidents. Wrong phase sequence The phase sequence in the distribution. If you've ever found yourself scratching your head over whether that metal door on your distribution cabinet really needs a grounding wire, you're not alone. In factories, construction sites, and even commercial buildings, this question pops up all the time. Each DISTRIBUTION BOX and controller must be grounded. 26 mm 2 (10 AWG) ground wire must be used, and in all other markets a 6 mm 2 must be used. Solution: Ensure that the distribution box is reliably grounded, and the grounding wire should have sufficient cross-sectional area and be. Next, we describe directional elements suitable to provide ground fault protection in solidly- and low-impedance grounded distribution systems.