Schneider Electric 17S Series User Manual

11

Standards and Compliances, continued

If you want to reference the international SERCOS communications standard, get a 
copy of:

International Standard IEC 1491, 

Electrical Equipment of Industrial Machines – 

Serial Data Link for Real-Time Communication between Controllers and Drives.

SERCOS is an industry standard term that refers to a special type of fiber–optic 
communication protocol, as defined by the SERCOS Interface, Inc., promotion 
society.  (SERCOS

® 

interface is a trademark of SERCOS Interface, Inc., promotion 

society.)

UL Listed (cUL Certified) drives (Underwriters Laboratories Inc.) comply with the 
relevant American and Canadian standards (in this case, UL 840 and UL 508C).

This standard describes the minimum requirements for electrically operated power 
conversion equipment (such as frequency converters and drives) and is intended to 
eliminate the risk of injury to personnel from electric shock or damage to equipment 
from fire. Conformance with the United States and Canadian standard is 
determined by an independent UL (cUL) fire inspector through the type testing and 
regular checkups.

UL 508C describes the minimum requirements for electrically operated power 
conversion equipment (such as frequency converters and drives) and is intended to 
eliminate the risk of fire caused by that equipment.

UL 840 describes air and insulation creepage spacings for electrical equipment and 
printed circuit boards.