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Posted on 04 July 2019

Design-in Recommendations: Applications for 600 V in Accordance with UL

Creapage and Clearance Distances

 

 

 

 

 

 

 

Below is a summary of several important UL requirements:

  • PCB components are approved to UL 1059 and are tested without a PCB or application environment.
  • Applications are approved to UL 508 (or UL 508C Power Conversion Equipment, e.g. frequency converters).
  •  The application designer must refer to the application-related UL standards, not to UL 1059.
  • UL 508C enables the use of field terminals approved to UL 1059 for 300 V to be used for 600 V applications under certain conditions.

Weidmüller Powermate Range plug-in connectors and power terminals comply with the conditions and may be used for 600 V applications to UL 508C.

For more detailed information, please refer to the drawing below.

 

Extract from UL 508C: (36.9 Spacings for drives evaluated in accordance with UL 840)

 

36.9.1 Other than as noted in 36.9.2 and 36.9.3, clearances and creepage distances are able to be evaluated in accordance with the requirements in the Standard for Insulation Coordination Including Clearance and Creepage Distances for Electrical Equipment, UL 840.

See 36.9.4 for details on applying UL 840.

36.9.2 Clearances between an uninsulated live part and the walls of a metal enclosure, including fittings for conduit or armored cable, shall be in accordance with 36.2.2. The clearances shall be determined by physical measurement.

36.9.3 The clearance and creepage distance at field wiring terminals shall be in accordance with the requirements in 36.3.1. Exception: When the design of the field wiring terminals precludes the possibility of reduced spacing due to stray strands or improper wiring installation, then clearance and creepage distances at these terminals are able to be evaluated in accordance with the Standard for Insulation Coordination Including Clearance and Creepage Distances for Electrical Equipment, UL 840.

 


 

The maximum voltage to be applied to the connector depends on the distance between two connections.

Two distances have to be taken in account:

  • Clearance = shortest distance between two conductive parts (in air)
  • Creepage distance = distance along surface

UL Clearance and Creepage Distances

 

For more information, please read:

Connection Systems - Connectors and Terminals

 

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