to Supply Circuit.
(A) Fixed and Stationary Equipment Fixed and stationary X-ray equipment shall be connected to the power supply by means of a wiring method
complying with applicable requirements of Chapters
1 through 4 of this Code, as modified by this article.
Exception: Equipment properly supplied by a branch circuit rated at not over 30 amperes shall be permitted to be supplied through a suitable attachment plug and hard-service cable or cord.
(B) Portable, Mobile, and Transportable Equipment.
Individual branch circuits shall not be required for portable, mobile, and transportable medical X-ray equipment requiring a capacity of not over 60 amperes.
(C) Over 600-Volt Supply. Circuits and equipment operated on a supply circuit of over 600 volts shall comply with Article 490.
517.72 Disconnecting Means.
(A) Capacity. A disconnecting means of adequate capacity for at least 50 percent of the input required 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.
(B) Location. The disconnecting means shall be operable from a location readily accessible from the X-ray control.
(C) Portable Equipment. For equipment connected to a 120-volt branch circuit of 30 amperes or less, a grounding-type attachment plug and receptacle of proper rating shall be permitted to serve as a disconnecting means.
517.73 Rating of Supply Conductors and Overcurrent
Protection.
(A) Diagnostic Equipment.
(1) Branch Circuits. The ampacity of supply branch- circuit conductors and the current rating of overcurrent pro tective devices shall not be less than
50 percent of the momentary rating or 100 percent of the long-time rating, whichever is greater.
(2) Feeders. The ampacity of supply feeders and the current rating of overcurrent protective devices supplying two or more branch circuits supplying X-ray units shall not be less than 50 percent of the momentary demand rating of the largest unit plus 25 percent of the momentary demand rating of the next largest unit plus 10 percent of the momentary demand rating of each additional unit. Where simultaneous biplane examinations are undertaken with the X-ray units, the supply conductors and overcurrent protective devices shall be 100 percent of the momentary demand rating of each X-ray unit.
FPN: 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 disconnecting means, and overcurrent protection.
(B) Therapeutic Equipment. The ampacity of conductors and rating of overcurrent protective devices shall not be less than 100 percent of the current rating of medical X-ray therapy equipment.
FPN: The ampacity of the branch-circuit conductors and the ratings of disconnecting means and overcurrent protection for X-ray equipment are usually designated by the manufacturer for the specific installation.
517.74 Control Circuit Conductors.
(A) Number of Conductors in Raceway. The number of control circuit conductors installed in a raceway shall be determined in accordance with 300.17.
(B) Minimum Size of Conductors. Size 18 AWG or 16
AWG fixture wires as specified in 725.49 and flexible
cords