How to Label an Industrial Control Enclosure

Industrial control enclosures are cabinets, consoles, computer furniture and panels that will contain industrial electrical equipment. These enclosures are designed to hold items that run at high voltages and that would normally be extremely dangerous if left open. Enclosures are weatherproof and not only protect the electrical equipment from outside forces, but also protect everything around the enclosure from the electrical device held within. Industrial enclosures must be labeled following strict guidelines provided by the National Electric Code, or NEC. This code was put in place to avoid any possible hazards when the item is checked, moved or repaired.

Instructions

- 1
  Ensure that the enclosure's manufacturer's trademark, name or other identifying information appears on the label. You will frequently see the name of the manufacturer as well as a serial number for that specific enclosure.
- 2
  List the frequency, full load current, phase and voltage of the power supply used in the enclosure.
- 3
  Display the SCCR. The SCCR is the short circuit current rating and indicates the maximum current the enclosure can withstand for 50 milliseconds before the device shorts. Originally, the SCCR was not needed, but as of 2005, the NEC changed the guidelines, and the SCCR must be displayed on all industrial enclosures. The method of calculating the SCCR can be found in the UL508A Supplement SB or by a method used by a local engineer or electrical inspector that has been approved.
- 4
  Make a note that the industrial enclosure is a piece of service equipment if this is applicable. Include the rating number of the enclosure and a diagram of the electrical wiring or an index number that refers to a specific wiring diagram. The rating number refers to the environment where the enclosure is placed. Factors that play into the rating are the size, type and location of the enclosure.

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