UL 943B-2017
UL Standard for Safety Appliance Leakage-Current Interrupters (Third Edition)

Standard No.

UL 943B-2017

Release Date

2017

Published By

Underwriters Laboratories (UL)

Status

Be replaced 2017-12

Replace By

UL 943B BULLETIN-2017

Latest

UL 943B BULLETIN-2017

Scope

These requirements cover appliance leakage-current interrupters (ALCIs)@ intended for use only in 2- or 3- wire alternating-current circuits wherein one of the wires is grounded in accordance with the National Electrical Code@ ANSI/NFPA 70. They are intended to interrupt the electric circuit to the load when a fault current to ground exceeds some predetermined value that is less than that required to operate the overcurrent protective device of the supply circuit. An ALCI trips when the current to ground reaches a value in the range of 4 ?C 6 mA. These requirements cover 2-wire appliance leakage-current interrupters for use only in cord-connected appliances intended for connection to alternating-current circuits of 250 V or less. An additional ground conductor may be provided. They are not to be provided with a general-purpose outlet receptacle@ cord-connector body@ or similar devices. Devices complying with these requirements are acceptable for use as components in an end product where the acceptability of the combination is to be determined. The acceptability of an appliance leakage-current interrupter in any particular application depends upon its ability to be used continuously under the conditions that prevail in actual service. Accordingly@ for a particular application@ an appliance leakage-current interrupter may be affected by the requirements for the equipment it is used in@ and it may be necessary to additionally evaluate features or performance characteristics that are not specified in this standard. This standard does not cover ground-fault circuit-interrupters@ which are covered by the Standard for Ground-Fault Circuit-Interrupters@ UL 943.

UL 943B-2017 history

• 2017 UL 943B BULLETIN-2017 UL Standard for Safety Appliance Leakage-Current Interrupters (COMMENTS DUE: October 23@ 2017)
• 2017 UL 943B-2017 UL Standard for Safety Appliance Leakage-Current Interrupters (Third Edition)
• 2016 UL 943B BULLETIN-2016 UL Standard for Safety Appliance Leakage-Current Interrupters (COMMENTS DUE: November 14@ 2016)
• 2013 UL 943B BULLETIN-2013 UL Standard for Safety Appliance Leakage-Current Interrupters (COMMENTS DUE: June 12@ 2013)
• 2012 UL 943B BULLETIN-2012 UL Standard for Safety Appliance Leakage-Current Interrupters (COMMENTS DUE: March 26@ 2012)
• 2011 UL 943B BULLETIN-2011 UL Standard for Safety Appliance Leakage-Current Interrupters (COMMENTS DUE: May 17@ 2011)
• 2011 UL 943B-2011 Appliance leakage-current interrupters
• 2009 UL 943B BULLETIN-2009 UL Standard for Safety Appliance Leakage-Current Interrupters (COMMENTS DUE: October 23@ 2009)
• 2005 UL 943B BULLETINS-2005 Ground-fault circuit-interrupters
• 2005 UL 943B BULLETIN-2005 UL Standard for Safety Appliance Leakage-Current Interrupters
• 2001 UL 943B-2001 UL Standard for Safety Appliance Leakage-Current Interrupters (First Edition; Reprint with Revisions Through and Including February 10@ 2010)