Article 660 X-Ray Equipment
Nothing in this article shall be construed as specifying safeguards against the useful beam or stray X-ray radiation.
Informational Note No. 1: Radiation safety and performance requirements of several classes of X-ray equipment are regulated under Public Law 90-602 and are enforced by the Department of Health and Human Services.
Informational Note No. 2: In addition, information on radiation protection by the National Council on Radiation Protection and Measurements is published as Reports of the National Council on Radiation Protection and Measurement. These reports can be obtained from NCRP Publications, 7910 Woodmont Ave., Suite 1016, Bethesda, MD 20814.
Long-Time Rating. A rating based on an operating interval of 5 minutes or longer.
Momentary Rating. A rating based on an operating interval that does not exceed 5 seconds.
Exception: The disconnecting means for the X-ray equipment shall not be required under either of the following conditions, provided that the controller disconnecting means is lockable open in accordance with 110.25:
- Where such a location of the disconnecting means for the X-ray equipment is impracticable or introduces additional or increased hazards to persons or property
- In industrial installations, with written safety procedures, where conditions of maintenance and supervision ensure that only qualified persons service the equipment
Informational Note: The minimum conductor size for branch and feeder circuits is also governed by voltage regulation requirements. For a specific installation, the manufacturer usually specifies minimum distribution transformer and conductor sizes, rating of disconnect means, and overcurrent protection.
Exception: Battery-operated equipment.