Hardware reference guide

Pwr. & Grnding. Guide
750
35013379 11/2011
Closed System Installation
Overview
For installations that must meet "Closed System" requirements, as defined in EN
61131-2 (without relying upon an external enclosure) in which an external Line Filter
is used, it must be protected by a separate enclosure which meets the "finger safe"
requirements of IEC 529, Class IP20.