UL 508A Industrial Control Panels Power …

1 2002 Eaton Corporation. All rights 508 AIndustrial Control PanelsPower Distribution and ControlLunch & Learn TrainingAgendazWho is UL and what role do they play?zWhat is the UL 508a Standard?zImplementation of the Standard Component Selection Short Circuit Current RatingszCommon Application QuestionszHow can Eaton help?zQ & AUL s RolezWho is UL and what role do they play? Independent Testing Company Offer 3rdParty Certification USA Centric, but Going Beyond (cUL) Consistent with NEC Offer a Variety of Listing Services UL 891 Deadfront Switchboards UL 1058 Drawout ACBs UL 67 Panelboards UL 98 Disconnect Switches UL 489 Molded Case Circuit Breakers UL 508a Industrial Control Panels UL 508E Self Protecting MMPs UL 508F Combination Motor Controllers (CMCs)UL 508a The StandardzThe Standard Industrial Control Panel Assemblies which may contain.

2 Motor controllers Overload relays Fused Disconnects / Circuit Breakers Buttons, Switches, Timers & Controllers Wiring Terminals Enclosures zFour Parts Part 1 General Use Part 2 Specific Use Part 3 Specific Component Requirements Part 4 Short Circuit Current RatingsUL 508a The StandardzGuideline for Construction and General Design First Edition was Released in April 2001 Revised September, 2005 Subsets of the Guideline General Use Specific Use Enclosures Industrial Machinery Crane Control Service Equipment Use Manufacturers that adhere to the requirements are eligible for UL 508a Listing of their product.

3 Flame Control Marine Use Air Conditioning and Refrigeration Elevator ControlUL 508a The Standard UL 508a Industrial Machinery The following types of machines are identified as Industrial machinery: metalworking machine tools, machines that cut or form metal Plastics Machinery, including injection molding, extrusion, blowmolding, specialized processing, thermoset molding and size reduction machines Wood machinery, woodworking, laminating and sawmill machines Assembly Machines Material handling machines, including Industrial robots and transfer machines Inspection and testing machines including coordinate measuring and in-process gauging machines UL 508a Industrial Control zPanels for Industrial Machinery are rated.

4 600V or less 40 CzUL 508a Industrial Rating does notinclude Panels for Hazardous Locations NRBX which is covered under UL698A Applying the StandardzBefore we apply Control Circuit vs Power CircuitApplying the StandardzBefore we apply Branch Circuit vs. Feeder CircuitApplying the StandardzBefore we apply Control Circuit vs Power CircuitzComponent Selection What can be used in UL 508a Control Panel Category Control #Applying the StandardzCategory Control Numbers Four to Five digit alphanumeric code Identifies product categories in UL s Listed Product and Recognized Components Directory AAAA (No Suffix) = Listed AAAA2 (Suffix 2 ) = Recognized AAAA7 (Suffix 7 ) = Listed for Canada AAAA8 (Suffix 8 )

5 = Recognized for Canada For example NITW is CCN for Industrial Control Panels and DIVQ for branch circuit protection (UL489 devices)UL s Website ( )Click onCertificationsUL s Website ( )Can search by a wide variety parameters for componentsUL s WebsiteIf we search by DIVQ we can find the s WebsitePage 2 DIVQ (con t)If we search by DIVQ we can find the the StandardzBefore we apply Control Circuit vs Power CircuitzComponent Selection What can be used in UL 508a Control Panel Category Control # Examples of Component SelectionComponent SelectionComponent SelectionzBranch Circuit Protection (DIVQ) Molded Case Circuit Breaker (DKPU2) Recognized Component Instantaneous-trip Circuit Breaker -*Procedure Described (PAQX) LV AC Power Circuit Breaker (JDDZ) Fuses (NKJH)

6 Self Protected Combination Motor Controller NOSupplementary Protectors NOMMPsApplying the StandardzSupplementary Protectors UL 1077 (QVNU2) Procedure Defined Future Product DevelopmentsBranch Circuit ProtectionPanelboardwith MCCBBRANCH CIRCUIT PROTECTIONUL 489 NEC 210wiring systemOUTLETOUTLETOUTLETS upplementary ProtectionApplication: Supplementary Protectors are to be used for overcurrent protection withinappliances or electrical equipment, where branch circuitprotection is already provided or not requiredDefinition of a Branch Circuit (NEC Article 210) the circuit conductors between the final overcurrent device protecting the circuit and the outlet(s), where.

7 The overcurrent device is the branch circuit protection the Outlet(s) is a point on the wiring system at which current is taken to supply utilization equipmentSupplementary Overcurrent Protection (NEC Article 240-10) where it shall not be used as a substitute for branch circuit O\C devices or in place of the branch circuit protection in Article ProtectionUL489\ \CSA CircuitProtectorUL508 ManualMotor Controller(UL508E MMPorUL508F CMC)MMControl Circuit TransformerPLCI/OContactorCoilsRelaysNEC 430 Part F\CECUL1077UL1077UL1077UL1077UL1077480 -120 Motor Control +Universal RotarySupplementary ProtectorApplying the StandardzBranch Circuit Protection Component Selection.

8 But what about Feeder Protection Branch Protection Components TransformersApplying the StandardzShort Circuit Protection Panel Rating New Standard requirements effective April 2006 Panel Builders will have to label with a value Panel Builders can use breakers or fusesShort Circuit Current RatingszRequires marking SCCR (Short Circuit Current Rating) on Industrial Control Panels . To provide info for safe installation and inspection of Panels based on application: available fault current to not to be considered in Short Circuit Current Ratings Transformers, reactors, dry-type capacitors, resistors,varistors, and voltmetersFault Current in a SystemMainControlPanelUnlimited Fault Current2,500kVA, Z = Fault12 Feet, 3,200A Copper FeederBusway3,200A3,200A Bus12,470V 480Y/277V60 Feet(3) 1-Conductor#4/0 CopperTHW InsulationSteel Conduit200A200A150A100 Feet(3) 1-Conductor#2 CopperTHW InsulationSteel ConduitBus PlugNote.

9 Obtain specific impedancevalues for each not assume the valuesshown here will be at 100% Motor Contributions10,96829,56064,32852,296 Applying the StandardShort Circuit Current Ratings OEM / Panelbuilderdetermines SCCR on panel by: Short circuit test of the panel constructionor Obtain documented tested combinations of components list from a manufacturer who has tested and documented combinations of components, and add these combinations topanelbuilder sUL procedure. Evaluate panel per UL508A, Supplement B (required by 4-06 if jurisdiction does not adopt 2005 NEC earlier).

10 All components in Power circuit must have ratings Ratings of starters are typically based on HP rating Supplement SB, Table , provides tables of components w/o marked short circuit ratingsApplying the StandardzSupplement SBDetermining Panel Compare SCCR of all Power components to SCCR of branch CPD. Use smaller value for line side of branch overall SCCR of panel:Determine per SB (next slides)YesMultipleDetermine per SB aboveYesSingleLowest SCCR for any Power component or Control overcurrent protection deviceNoSingleRatingBranch CPDB ranch CircuitCPD = Circuit Protective DeviceApplying the Feeder Components that limit Short Circuit Power Transformers Current Limiting Circuit Breakers FusesApplying the StandardzSB TransformersRatingSecondary VoltageSecondary DevicesSCCR on line side of circuitless than or = 10kVA not specifiedgreater than or = 5kAUse rating on primary overcurrent deviceless than or = 5kVA 120V maximumgreater than or = 2kAUse