1.1 This standard prescribes mandatory requirements for installation and application of DC power systems (stationary storage batteries and battery chargers/ rectifiers), uninterruptible power supply (UPS) systems, and solar photovoltaic systems. This document may not be attached to nor made part of purchase orders. 1.2 This standard does not apply to the following: • Storage batteries for motive power service • Battery chargers for communications applications • Batteries and battery chargers for stationary engine cranking service • Batteries for self contained emergency lighting fixtures • Photovoltaic systems for cathodic protection.