This standard document describes palisade and mesh fencing arrangements at grid and primary substations. Departure from these requirements may only be taken with the. The IEC has developed the ingress protection (IP) ratings, which grade the resistance of an enclosure against the intrusion of dust or liquids Electric and electronic equipment deteriorate or malfunction when water or dust enters the device. Note 2: this document, as MD WG-2014. 1, has been approved at the Machinery Working Group meeting on 5-6 November 2014. Safety fences are one element in the. In the tough and demanding industrial environment, machine safety fences from Anva not only contribute to effective and safe production, but also provide visual protection as a protective system. Special. Basic fence standards can be specified using the National Electric Safety Code (NESC) and IEEE/ANSI Standard C2. Minimum requirements for height and material are set out by the NESC. In addition. A distribution box is a low-voltage electrical enclosure that receives incoming power and distributes it safely to multiple outgoing circuits through protective and switching devices such as MCBs, RCDs, RCBOs, fuses, isolators, busbars, neutral bars, earth bars, and surge protective devices.