industrial control panels ul508a · ul 508a online certifications directory clause 1.2 –also...
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Industrial Control Panels
UL508A
Dirk Müller
UL 508A Online Certifications Directory
Underwriters Laboratories
Slide 2
UL 508A Online Certifications Directory
Outline of UL 508A
Slide 3
Industrial
Control
Procedure
UL508A
Descriptive
Procedure
Part 1
General Use
Supplement SA
Specific Component
Requirements
Part 2
Specific Use
Information you provide
Specific components not
covered in UL508A
Supplement SB
Short Circuit Current Ratings
Appendix B
Use of Unlisted Components
Appendix A
Standards for Components
UL 508A Online Certifications Directory
Clause 1.2 – Also Covers Specialty Type
Industrial Control Panels and Enclosures
• Flame safety supervision of
combustible fuel type equipment
• Elevator control
• Crane or hoist control
• Service equipment use
• Marine use
• Custom built Type 1 enclosures
• Air conditioning
• Refrigeration equipment
• Control of industrial machinery
including metalworking machine
tools, power press controls, and
plastic injection molding machinery
Slide 4
UL 508A Online Certifications Directory
Online Certifications Directory
Slide 5
www.ul.com/database/
UL 508A Online Certifications Directory
Terminal Block Example
Slide 6
XCFR2
Terminal Blocks - ComponentsSee General Information for Terminal Blocks - Component
Cat. No.
Wire
Range
Wire
Type FW
TQ
Lb In. V A UG CA
50 PLTVV## 22-12 CU 2 20 300 20 C,D 2(105C),*
60 PLTVV## 18-12 CU 2 20 600 20 C 2(105C),*
80 PLTVV## 18-8 CU 2 20 600 50 C 2(105C),*
M6/8,D2##, 18-8 CU 2 7.1-20 600 50 C 2(105C),*
Note: ## May be provided with suffix TR.
UL 508A Online Certifications Directory
Section 6 Terminology
Slide 7
UL 508A Online Certifications Directory
Single Motor Branch Circuit Protection Sizing
Slide 8
Step 3: Check Starter for
Specific Instructions
BCP
Starter
MotorStep 1: Determine Motor
Full Load Amps
Step 2: Size Protection Per
Table 31.1 Based on Type
of Device
UL 508A Online Certifications Directory
Single Branch Circuit Protection Sizing
Slide 9
Step 3:
Starter does not indicate type of protection
Step 1:
Motor is 480 V, 3 Ø, 7-1/2 HP.
Per Table 50.1, FLA is 11.0 Amps
Step 2:
31.3.1:For a UL Listed Circuit Breaker
11.0 Amps x 250%=27.5 Amps
Breaker Size shall not exceed 30 Amps
(If calculation results in a non-standard
size, the next highest standard
size may be selected)
BCP
Starter
Motor
UL 508A Online Certifications Directory
Clause 37.4 – Segregation of Field Wiring
Terminals of Class 2 Circuits
• Terminals for connection to Class 2 circuits shall be
• Segregated with a minimum permanent 2 in. separation, or
• Separated by a barrier
• from any non-Class 2 field-installed wires, and
• Marked as a Class 2 control circuit
Slide 10
UL 508A Online Certifications Directory
Industrial Control Panels – General Programs
• Field Evaluation (FEP)
• Evaluated and labeled by UL at installation site
• Listing Program
• Provides evidence of third-party certification
• One-of-a-kind panels or standardized designs
• Open or enclosed panels
• Listing mark applied by manufacturer in factory
• Limited Production Program
• Listing of individual products
• No continous production and factory inspections
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UL 508A Online Certifications Directory
News from the 2017 NEC
• This requirement is NOT for the panel builder but the responsibility of
the operator of the plant or facility!
Slide 12
UL 508A Online Certifications Directory
UL508A 2nd: Multiple Revision in 2017
Slide 13
• Alignment of UL508A with NEC: Voltage limit from 600V to 1000V
• Table Sa 1.2 for guidance of usage for ECBT2 Connectors
• SCCR rating, Voltage and Current ratings
• SB 4.3.1 Calculation of SCCR rating using a transformer
• More options than before
• And few others
UL 508A Online Certifications Directory
Questions
Slide 14