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11.2 Cord connection
11.2.1 General
11.2.1.1 Other than a flush-wall mounted converter or a converter or inverter for which specific installation
instructions are required, a converter or inverter requiring provision for connection to a source of supply
that will facilitate the interchange of equipment to maintain continuous service or otherwise meet special
conditions of use may employ Type S, SE, SEOO, SO, ST, STO, SJ, SJE, SJEOO, SJO, SJT, SJTO,
SP-3, or SPT-3 flexible cord with a grounding conductor.
11.2.1.1 revised July 8, 1996
11.2.1.2 The current and voltage ratings of a flexible supply cord and attachment plug for a converter or
inverter shall not be less than the input rating of the converter or inverter. The loads drawn by a single or
duplex receptacle shall be included in determining the input rating as described in 55.4.
11.2.1.2 effective April 13, 1993
11.2.1.3 The length of supply cord external to the converter or inverter shall not be more than 3 feet (914
mm) measured from the face of the attachment plug to the point of entry.
11.2.1.3 effective April 13, 1993
11.2.1.4 A power supply cord shall terminate in a grounding-type attachment plug.
11.2.1.4 effective April 13, 1993
11.2.1.5 The ampacity of the attachment plug shall not be less than 125 percent of the marked input
rating of the converter or inverter.
11.2.1.5 effective April 13, 1993
11.2.1.6 A cord-connected converter shall not have more than one single or duplex enclosure-mounted
grounding-type receptacle for general use and there shall be no provision for remotely wired line-voltage
circuits.
11.2.2 Strain relief
11.2.2.1 Strain relief shall be provided to prevent stress on the supply cord or output cord from being
transmitted to terminals, splices, or interior wiring. See 42.1.
11.2.2.2 A metal strain-relief clamp or band is acceptable without supplementary protection on a Type S,
SE, SEOO, SO, ST, STO, SJ, SJE, SJEOO, SJT, or SJTO cord. A metal strain-relief clamp or band is
acceptable on a Type SP-3 or SPT-3 cord only if adequate supplementary nonconductive mechanical
protection is provided over the cord.
11.2.2.2 revised July 8, 1996
11.2.2.3 If a knot in a flexible cord serves as strain relief, the surfaces that the knot may touch shall be
free from burrs, fins, sharp edges, and projections that can damage the cord.
11.2.2.4 Means shall be provided to prevent the flexible cord from being pushed into the converter or
inverter enclosure through the cord-entry hole if such displacement might result in mechanical damage to
the cord, expose the cord to a temperature higher than that for which it is acceptable, or reduce spacings,
such as to a metal strain-relief clamp, below the minimum acceptable values.
11.2.2.4 effective April 13, 1993
OCTOBER 15, 2004 UL 458 24A
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