Isolated Power Systems Equipment

UL 1047

1 Scope

1.1 These requirements cover isolated power systems equipment rated 600 Vac or less, intended for installation and use in nonhazardous areas in health care facilities in accordance with the requirements in Article 517 of the National Electrical Code, NFPA 70, and in the Standard for Health Care Facilities, NFPA 99.

1.2 These requirements cover isolated power centers, either cord-connected or permanently wired, consisting of a distribution panel that incorporates an isolation transformer, one or more isolated ungrounded secondary circuits terminating in integrally mounted grounding-type receptacles, a reference grounding bus bar, and line isolation monitor. Isolated power centers may have provision for connection of grounding conductors to remote grounding jacks, the room bonding points, and patient equipment grounding points. A permanently wired isolated power center may also have provision for connection to remote receptacles or indicators.

1.3 These requirements cover convertible system units that facilitate a temporary conversion of the power supply for a power center from a grounded supply to an isolated supply.

1.4 These requirements cover isolated power panelboards that incorporate the same features as permanently wired isolated power centers except that:

a) They may be supplied from remote isolation transformers, and

b) The secondary isolated circuits are intended to be connected by conduit to remotely located receptacles.

1.5 These requirements cover wall modular units containing isolated power systems.

1.6 These requirements cover cord-connected isolated power centers, and panels intended to supply x-ray equipment only.

This new edition is a periodic re-issuance to ensure that UL Standards remain up-to-date with regard to format and editorial issues such as renumbering, repaginating, correction of editorial errors, correction of cross-references and updating titles of referenced Standards.

In addition, this new edition includes revisions in accordance with the UL bulletins on this subject dated March 5, 2003 and July 7, 2003.