MAN0923_Issue 3_04/15
Touchpoint Pro
Operating Instructions
50
4. Electrical Installation
Figure 4.5
Screened cable with armour (wire or braid) with metal junction box and/or sensor
•
The armour must be connected to Protective Earth and the screen should be connected to the
Touchpoint Pro enclosure’s common earth (ground) rail
•
The metal sensor/junction box must be connected to Protective Earth
•
The armour would typically be connected through a metal cable gland to a metal JB or controller
enclosure, but great care must be taken to avoid ground loops by preventing the armour coming into
contact with either the enclosure or the cable screening.
4.7 EMC / RFI Considerations
For installations in Europe, all electrical equipment connected to the system should comply with the EMC
Directive 2004/108/EC. For non-European installations, electrical equipment connected to the system
should comply with applicable national or international EMC standards.
All external and field cables connected to the Touchpoint Pro system must be screened in order to ensure
correct operation of the system and to meet European Standards for RFI and EMC. The cable screen
should be properly terminated to earth at one end only (the Touchpoint Pro side) to avoid earth loops.
All screens should be terminated at the instrument earth bar provided in the enclosure.
External cabling associated with the Touchpoint Pro system should be isolated from other equipment
cabling, in particular any high voltage or high current cabling.
P
Incoming
Client
Earth
Three Core Cable with Screen and Armour with Screen Earthed at Controller
and Armour Earthed in Field
Junction
Box
Sensor
Armour
Screen
