IEEE Std 1653.6 pdf download IEEE Recommended Practice for Grounding of DC Equipment Enclosures in Traction Power Distribution Facilities 5.2 NEC requirements ln accordance with NEC Article 90.2(B)(1),installation for railways for generation，transformation,transmission, and distribution of power used exclusively for the operation of rolling stock are not coveredby the NECR[B4].5 5.3 Solid grounding Solidly grounded dc enclosures are connected to earth...