669.1 Scope. The provisions of this article apply to the installation of the electrical components and accessory equipment that supply the power and controls for electroplating, anodizing, electropolishing, and electrostripping. For purposes of this article, the term electroplating shall be used to identify any or all of these processes.
669.3 General. Equipment for use in electroplating pro- cesses shall be identified for such service.
669.5 Branch-Circuit Conductors. Branch-circuit con- ductors supplying one or more units of equipment shall have an ampacity of not less than 125 percent of the total connected load. The ampacities for busbars shall be in accordance with 366.23.
669.6 Wiring Methods. Conductors connecting the electrolyte tank equipment to the conversion equipment shall be in accordance with 669.6(A) and (B).
(A) Systems Not Exceeding 50 Volts Direct Current. In- sulated conductors shall be permitted to be run without insulated support, provided they are protected from physical damage. Bare copper or aluminum conductors shall be permitted where supported on insulators.
(B) Systems Exceeding 50 Volts Direct Current. Insu- lated conductors shall be permitted to be run on insulated supports, provided they are protected from physical damage. Bare copper or aluminum conductors shall be permitted where supported on insulators and guarded against accidental contact up to the point of termination in accordance with 110.27.
669.7 Warning Signs. Warning signs shall be posted to indicate the presence of bare conductors.
669.8 Disconnecting Means.
(A) More Than One Power Supply. Where more than one power supply serves the same dc system, a disconnecting means shall be provided on the dc side of each power supply.
(B) Removable Links or Conductors. Removable links or removable conductors shall be permitted to be used as the disconnecting means.
669.9 Overcurrent Protection. Direct-current conductors shall be protected from overcurrent by one or more of the following:
(1) Fuses or circuit breakers
(2) A current-sensing device that operates a disconnecting means
Other approved means