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Introduction. Introduction. Overview of Code Changes in NEC Article 409. Highlights from 2005 NEC Article 409 . Overview of Supplement SB from UL 508A. Overview of Supplement SB from UL 508A.

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Introduction l.jpg

Introduction


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Introduction


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Overview of Code Changes in NEC Article 409


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Highlights from 2005 NEC Article 409


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Overview of Supplement SB from UL 508A


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Overview of Supplement SB from UL 508A

  • Paragraph SB3.2.1 states that the primary short circuit protective device for the Control Circuit is also included in the calculation for the SCCR for the Power Circuit.

  • Therefore, the SCCR of a Supplementary Protector or set of Fuses used on the primary side of a Control Power Transformer are included in the determination of the SCCR of the Control Panel.

  • Control Circuit Components downstream of these devices would not be included in the calculation of the SCCR

  • Examples of Control Circuit Components:

Control Circuit Components are not included in the Panel SCCR calculation


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Overview of Supplement SB from UL 508A

  • SB4.2 - Determine the SCCR of Individual Power Circuit Components

    • From the device markings

    • From a UL Table that lists the assumed max SCCR for unmarked components

    • From Manufacturer’s UL listed Combination Motor Controller testing of multiple components

  • SB4.3 - Modify the SCCR when using Current Limiting Feeder Components

    • Review the Peak Let-through Currents

    • Current Limiting Circuit Breakers

    • Fuses

  • SB4.4 - Determine the SCCR of the Control Panel based on the lowest SCCR of any component or circuit


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Overview of Supplement SB from UL 508A

  • SB4.2 - Determine the SCCR of Individual Power Circuit Components

    • From the device markings

    • From a UL Table that lists the assumed max SCCR for unmarked components

    • From Manufacturer’s UL listed Combination Motor Controller testing of multiple components

  • SB4.3 - Modify the SCCR when using Current Limiting Feeder Components

    • Review the Peak Let-through Currents

    • Current Limiting Circuit Breakers

    • Fuses

  • SB4.4 - Determine the SCCR of the Control Panel based on the lowest SCCR of any component or circuit


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SB4.2 - Determine the SCCR of individual power circuit components – 3 Possible Methods

SHORT CIRCUIT 5KA, 600V


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SB4.2 - Determine the SCCR of individual power circuit components – 3 Possible Methods


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SB4.2 - Determine the SCCR of individual power circuit components – 3 Possible Methods


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SB4.2 - Determine the SCCR of individual power circuit components – 3 Possible Methods


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PD&C Internet Resource Center for SCCRs


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PD&C Internet Resource Center for SCCRs


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PD&C Internet Resource Center for SCCRs


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PD&C Internet Resource Center for SCCRs

In this summary document there are multiple tabs for different product combinations


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PD&C Internet Resource Center for SCCRs


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PD&C Internet Resource Center for SCCRs


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Layout of Tables for UL Tested Combinations

1st half of chart provides SCCRs for the individual components

2nd half of chart provides SCCR for the combination of components


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PD&C Internet Resource Center for SCCRs

}

Detailed Breakdown of the Summary File


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PD&C Internet Resource Center for SCCRs


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PD&C Internet Resource Center for SCCRs


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UL Listed High SCCR for SIRIUS Component Assemblies with Breakers, Fuses & MSPs

This data can be used by the customer for calculation of their panel SCCR, but it can not be posted to the UL website


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UL Listed High SCCR for SIRIUS Component Assemblies with Breakers, Fuses & MSPs

}

UL Files for Support Documentation


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UL Listed High SCCR for SIRIUS Component Assemblies with Breakers, Fuses & MSPs

  • Excerpt from the UL File for 3RT102 Contactors

The customer can provide copies of these reports to UL, if requested


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PD&C Internet Resource Center for SCCRs

Link to UL Website


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UL Website for SCCR for Combination Motor Controller Components


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UL Website for SCCR for Combination Motor Controller Components

Alphabetized, so we will move down the list as more competitors are added


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UL Website for SCCR for Combination Motor Controller Components

Same as the Summary file on the Siemens Website


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PD&C Internet Resource Center

}

Links for additional information


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Overview of Supplement SB from UL 508A

  • SB4.2 - Determine the SCCR of Individual Power Circuit Components

    • From the device markings

    • From a UL Table that lists the assumed max SCCR for unmarked components

    • From Manufacturer’s UL listed Combination Motor Controller testing of multiple components

  • SB4.3 - Modify the SCCR when using Current Limiting Feeder Components

    • Review the Peak Let-through Currents

    • Current Limiting Circuit Breakers

    • Fuses

  • SB4.4 - Determine the SCCR of the Control Panel based on the lowest SCCR of any component or circuit


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SB4.3 – Current Limiting Devices


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SB4.3 – Current Limiting Devices

  • Example 1: Standard Breaker

    • ED63B100 100A25 kA @480V

    • All components downstream have a rating of at least 25 kA

    • Panel SCCR = 25 kA

  • Example 2: Current Limiting Breaker

    • CED63B100 100A200 kA @480V

    • At 100 kA the CED63 has a peak let through current of 22 kA

    • All components downstream have a rating of at least 25 kA

    • All components have a SCCR higher than 22 kA

    • Panel SCCR = 100 kA

22 kA

100 kA


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Overview of Supplement SB from UL 508A

  • SB4.2 - Determine the SCCR of Individual Power Circuit Components

    • From the device markings

    • From a UL Table that lists the assumed max SCCR for unmarked components

    • From Manufacturer’s UL listed Combination Motor Controller testing of multiple components

  • SB4.3 - Modify the SCCR when using Current Limiting Feeder Components

    • Review the Peak Let-through Currents

    • Current Limiting Circuit Breakers

    • Fuses

  • SB4.4 - Determine the SCCR of the Control Panel based on the lowest SCCR of any component or circuit


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SB4.4 – Final Determination of the Control Panel SCCR


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SCCR Control Panel Calculation Examples


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SCCR Control Panel Calculation Examples


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SCCR Control Panel Calculation Examples

100 kA @ 480V


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SCCR Control Panel Calculation Examples


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Process Flow Charts

  • Determination of the SCCR of a Component (SB4.2)

  • Determination of the SCCR with Current Limiting Feeder Components (SB4.3)

  • Determination of the SCCR of the Control Panel (SB4.4)


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What does this mean to Siemens?

  • We must focus on SCCR Ratings as a competitive advantage for our customers

    • Customers will migrate to tested combinations

    • Focus will be on single manufacturers for Power Circuit Components

    • Lack of focus may cause loss of breaker sales to fuses

  • Use tested combinations as advantage to displace niche and emerging competitors

    • Testing combinations is expensive and time consuming

    • It is unlikely that Manufacturers will test with competitor’s products

    • OEMs would have to submit their panel at their expense when not using combination tested components

  • What to do when Customers request SCCRs for individual components

    • Clarify Request

      • Individual Components

      • Tested Combinations

    • Use E-mail script from SiteScape

    • Send them to our on-line Resource Center


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Issues / Comments

  • Not all States have adopted the 2005 Code

  • Inspectors have not been trained on UL 508A SCCR process

  • If we don’t educate our customers, our competitors will

  • Talk with confidence


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Summary of Resources

  • On-line Resource Center

    • White Paper

    • Combination Motor Controller files

    • Additional UL files for non-Combination testing

    • Link to Official UL Website for SCCRs by competitor

    • Links to Standards Organizations for additional information

  • SiteScape

    • A copy of this Power Point

      • Folder Path: Product Information / Controls – D, Dx, T, V Modules / General

      • File Name: SCCR Overview UL508A NEC409 May 11 2006.PPT

    • E-mail Script for Customer Inquiries

      • Folder Path: Product Information / Controls – D, Dx, T, V Modules / General

      • File Name: SCCR E-mail Script.doc


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Next Steps

  • Continue testing combinations to fill in gaps

    • SIRIUS Contactors & Overload Relays with Sentron breakers

    • SIRIUS 3RW4 Soft Starters (testing complete, must be posted)

  • Test NEMA, IEC & DP with new Circuit Breakers

    • NGG

    • EG

    • 3VL

  • Develop a database for Minimum SCCRs by Component

  • Develop a search engine for SCCRs

    • Individual Components

    • Combination Motor Controller Components

  • Continue to post up-to-date information to the Internet Resource Center

  • Siemens will sponsor a Webcast with Plant Engineering Magazine


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Control Panel Compliance WebcastJune 21, 2006 10 a.m. CDT

  • Learn what your responsibilities are when upgrading and specifying equipment for your plant, how to comply with current regulations and how to minimize the potential for equipment damage or injury to personnel from our panel of experts who will discuss:

    • Interaction between UL 508A and NEC Article 409

    • How to ensure compliance when specifying equipment

    • The inspection process and how it affects the end user

    • How to ensure compliance when relocating or maintaining equipment

  • Panelists: Jim Pauley, Schneider Electric / Todd Lottmann, Cooper Bussmann / Jim Wright, Siemens Energy & Automation


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