660.4 Connection to Supply Circuit.
I. General
(A) Fixed and Stationary Equipment. Fixed and stationary X-ray equipment shall be connected to the power supply by means of a wiring method meeting the general requirements of this Code. Equipment properly supplied by a branch circuit rated at not over
30 amperes shall be permitted to be supplied through a
suitable attachment plug cap and hard-service cable or
cord.
660.1 Scope. This article covers all X-ray equipment operating at any frequency or voltage for industrial or other nonmedical or nondental use.
FPN: See Article 517, Part V, for X-ray installations in health care facilities.
Nothing in this article shall be construed as specifying safeguards against the useful beam or stray X-ray radiation.
FPN 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.
FPN 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.
660.2 Definitions.
Long-Time Rating. A rating based on an operating interval of 5 minutes or longer.
Mobile. X-ray equipment mounted on a permanent base with wheels and/or casters for moving while completely assembled.
Momentary Rating. A rating based on an operating interval that does not exceed 5 seconds.
Portable. X-ray equipment designed to be hand-carried.
Transportable. X-ray equipment that is to be installed in a vehicle or that may be readily disassembled for transport in a vehicle.
660.3 Hazardous (Classified) Locations. Unless identi fied for the location, X-ray and related equipment shall not be installed or operated in hazardous (classified) locations.
FPN: See Article 517, Part IV.
(B) Portable, Mobile, and Transportable Equipment. Individual branch circuits shall not be required for portable, mobile, and transportable X-ray equipment requiring a capacity of not over 60 amperes. Portable and mobile types of X-ray equipment of any capacity shall be supplied through a suitable hard-service cable or cord. Transportable X-ray equipment of any capacity shall be permitted to be connected to its power supply by suitable connections and hard-service cable or cord.
(C) Over 600 Volts, Nominal. Circuits and equipment operated at more than 600 volts, nominal, shall comply with Article 490.
660.5 Disconnecting Means. A disconnecting means of adequate capacity for at least 50 percent of the input re quired for the momentary rating, or 100 percent of the input required for the long-time rating, of the X-ray equipment, whichever is greater, shall be provided in the supply circuit. The disconnecting means shall be operable from a location readily accessible from the X- ray control. For equipment connected to a 120-volt, nominal, branch circuit of 30 amperes or less, a grounding-type attachment plug cap and receptacle of proper rating shall be permitted to serve as a disconnecting means.
660.6 Rating of Supply Conductors and Overcurrent
Protection.
(A) Branch-Circuit Conductors. The ampacity of supply branch-circuit conductors and