SUMMARY OF REQUIREMENTS
The following is a brief summary of the revised paragraphs in the Standard for
Medium-Voltage AC Contactors, Controllers, And Control Centers, UL 347, which have a future Effective Date of January 2, 2019 and the action that may be required to determine compliance.
Paragraphs / General Subject and Comment /4.202 / Standard fault interrupting ratings are 40 kA and 50 kA symmetrical. No action required, as other interrupting ratings are allowed.
4.204.2 / Defines starting duty for solid state controllers. May require construction changes
5.3.203 / Ground bus required for all equipment with extendable power bus and all assemblies with multiple vertical sections. May require construction changes for products previously investigated to UL 347B.
5.3.204 / New requirements for grounding provisions. May require construction changes.
5.3.205 / Grounding required in the test position. May require construction changes.
5.3.208 / Provision for bonding of conductor shields to ground bus. May require construction changes.
5.10 / Markings required in language appropriate for country. May require construction (marking) changes.
5.10.201 / Serial number, date code, or equivalent now required. May require construction (marking) changes.
5.10.202 / Additional markings required.
5.10.204 / Additional markings required.
5.10.205.1 / Markings for Service Equipment required. Only affects devices intended for use as service equipment.
5.10.206 / Specific information required in instructions, diagrams, etc.
5.11.201 / Additional interlocking required in certain cases. May require construction changes.
5.11.202.1 / Additional requirements for drawout elements. May require construction changes.
5.11.203 / Additional door interlocks in some cases. May require construction changes.
5.11.204 / Interlocks for start and run contactors in autotransformer starters. May require construction changes for any of these starters rated over 7.2 kV.
5.12.201 / Strengthened requirements for visible evidence of isolating distance, windows and indicators. May require construction changes.
5.13 / Optional degree of protection markings. (IEC IP type ratings)
5.17 / Insulating materials shall have HB or better flammability rating. May require construction changes and retesting.
5.102.204 / All covers of medium voltage compartments shall be bolted closed, not simply closed by a latch. Additional hinge requirements. All doors shall be capable of being opened to a minimum of 90 degrees from the closed position. May require construction changes.
5.102.210 / Outdoor enclosures must be lockable. May require construction changes.
5.201 / Additional requirements for latched contactors. May require construction changes.
5.202 / Additional requirements for power circuit isolating means. May require construction changes.
5.203(k) / Thermal sensor must be provide on hottest heat sink in each phase. May require construction change.
5.203(o) / Requirements for voltage dividers. May require construction changes.
5.204 / Requirements for service equipment. May require construction and marking changes.
5.207 / Requirements for bus bar connections of control centers. May require construction changes.
5.208 / Requirements for connector and grounding kits. May require construction and marking changes.
5.21 / Wire bending space requirements strengthened to require instructions and consideration of stress cones, etc. May require construction changes and additional instructions.
5.211 / Requirements for accessories intended for field installation. May require construction changes.
5.212 / Requirements for blank space and future controller spaces. May require construction changes.
5.213 / Requirements for insulated bus bars (when provided). May require construction changes.
6.1 / Tests to be conducted at RATED frequency. May require retesting at proper frequency for some tests.
6.2.201.2 / New impulse test procedure. Will require new methods be used. No retest required on currently Listed equipment, but new method to be used on all future tests.
6.2.201.3 / Test requirements when surge arresters are used. May require retest.
6.2.202.5 / Dielectric testing required for bus insulation. May require retest.
6.2.203 / Partial Discharge Test for products over 7.2 kV. May require retesting
6.4 / Measurement of contactor resistance required before and after testing. May require retest.
6.5.2 / Clarification of test method for controllers with extendable bus. May require retest.
6.5.5.201 / Temperature test method has changed for solid state controllers. May require retest.
6.6.2 / Short time Current withstand and moment current withstand test requirements, including ground bus. May require retest.
6.101.2 / Mechanical endurance test increased to 10,000 operations (from 6000). May require retest.
6.101.3 / Interlock integrity test, requiring 1000 operations. May require retest.
6.102.202 / Make and break capability test for solid state controllers has changed. May require retest.
6.103.206 / Overload test for solid state controllers has changed. May require retest.
6.104.203 / Contact resistance measured before and after the fault interruption test. May require retest.
6.104.205.2 / Fault interruption test has changed for solid state controllers. May require retest.
6.104.206(f) / Additional requirements for sealed interrupters. May require retest.
6.202.2 / Short time capability test has changed for solid state controllers. May require retest.
6.205 / New enclosure ground integrity test. May require testing.
6.206 / New shutter integrity test. May require retest.
6.207 / New rod entry test. May require retest.
Section 7 / Routine tests added. Will require follow up program.