Overview of Code Changes in NEC Article 409

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(No Transcript)
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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

CPTs Function Relays Limit Switches
Pilot Devices Safety Switches Relays Sensors
Terminal Blocks Cable-pull Switches Micro PLCs
Control Relays AS-Interface Components LOGO! Logic Modules
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 Manufacturers 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 Manufacturers 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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PDC Internet Resource Center for SCCRs
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PDC Internet Resource Center for SCCRs
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PDC Internet Resource Center for SCCRs
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PDC Internet Resource Center for SCCRs
In this summary document there are multiple tabs
for different product combinations
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PDC Internet Resource Center for SCCRs
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PDC 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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PDC Internet Resource Center for SCCRs

Detailed Breakdown of the Summary File
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PDC Internet Resource Center for SCCRs
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PDC 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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PDC 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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PDC 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 Manufacturers 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 100A 25 kA _at_480V
• All components downstream have a rating of at
  least 25 kA
• Panel SCCR 25 kA
• Example 2 Current Limiting Breaker
• CED63B100 100A 200 kA _at_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 Manufacturers 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 _at_ 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
  competitors 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 dont 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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• Questions?