Specification

Motor Control Solutions Introduction

Introduction

Schneider Electric offers a wide range of solutions to meet your motor control and

protection needs. This data bulletin contains information regarding the application

of those solutions in the United States and Canada.

Overview of U.S. Standards and Regulations

U.S. National Standards

Figure 1 outlines the national standards governing electrical installations in the

U.S.:

• National Electrical Code

(NEC), NFPA 70: Electrical Installation

• NFPA 79: Electrical Standard for Industrial Machinery

• UL 508A: Industrial Control Panels

• UL 489: Molded-Case Circuit Breaker, Molded-Case Switches

• UL 508: Industrial Control Equipment

• UL 508C: Power Conversion Equipment

• UL 98: Enclosed and Dead-Front Switches

• UL 512: Fuse Holders

• UL 248: Low Voltage Fuses

• UL 60947-4-1: Low Voltage Contactors and Starters

• UL 60947-5-1: Control Circuit Devices and Switching Elements

UL 508 Transition to UL 60947

The standard for Industrial Control Equipment, UL 508, has been harmonized with

the relevant product standards of the IEC standard for low-voltage control and

automation, IEC 60947.

This harmonization work was undertaken with the intent of creating standards that,

while being based upon and adopting IEC requirements, would incorporate

sufficient national differences to ease the transition from UL 508 to UL 60947-4-1.

This goal has largely been accomplished in all cases. While the UL 508 and UL

60947 series standards do not look the same, when taking into account the

national differences included in the harmonized standards, they are essentially

technically identical.

Products originally listed to UL 508 will maintain their listing with no expiration. UL

508 and UL 60947 products can be used interchangeably.

The following industrial control categories are affected by this harmonization effort.

Figure 1 – Standards

Installation NEC = NFPA 70

pplication NFPA 79

Product UL 489 UL 98 UL 512 UL 248

standard

UL 508A

UL 508C UL 60947

UL 508

NOTE: UL 508A is both an application and a

product standard.