Pilz PSEN op4H-s-30-150/1 - Manual (Page 36)

PSEN op4F/H-s Series Instruction Manual
32
•
The ground connection of the two units is not necessary for Class
III, while the use of a duly-insulated low-voltage feeder type SELV
or PELV is compulsory. In this case, we recommend covering the
earth symbol present on the caps of the two units with a blank
sticker.
• The ground connection of the two units is compulsory for Class I,
while the use of a duly-insulated feeder type SELV or PELV is not
compulsory but anyway recommended.
The following table is a summary of PSEN op4F/H-s electrical
protections.
Electrical protections Class I Class III
Ground Connection Compulsory Forbidden
Ground connection symbol Compulsory Forbidden
Power supply by generators
SELV / PELV
Recommended Compulsory