CHAPTER 2: INSTALLATION
MECHANICAL INSTALLATION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
2–21
Figure 2-24: Single bulkhead connector with single connectors and sensor fiber
Before installing the AF sensor units, ensure that all other drilling and installation is
complete to minimize possible damage to the sensitive unit and connected sensor fiber
cable.
FASTPATH:
Review the sensor fiber handling guidelines above.
Sensor fiber should be held in place loosely for the best long-term performance. Avoid
over-tightening ties which may deform or break the sensor fiber.
1.
Plan the path of the loop sensor fiber, looping through the chamber or chambers
requiring arc flash detection. See GET-20057
3 Series Arc Flash Application Note
for
detailed examples of loop sensor installation.
2.
Ensure that both ends of the loop remain close enough together to be reached by the
sensor fiber extension. If needed, gently pull apart the duplex sensor fiber extension
from the end with two single connectors, being careful not to bend the fiber with a
radius of less than 35 mm (1.3 inches).
3.
Ensure that the sensor fiber extension is long enough to reach the 350 relay from the
bulkhead connector location.
4.
Mount the bulkhead connector on the side of the chamber, following the drill hole
dimensions provided. Note that the single bulkhead connector uses washers 11.0 mm
(0.420 in) wide, so the drill holes must be spaced accordingly if the loop sensor path
begins and ends in the same place.
Figure 2-25: Bulkhead connector cutout
5.
Install the loop sensor carefully, following all sensor fiber handling guidelines.
6.
Plug the ends of the loop sensor into the bulkhead connectors.
7.
Plug the single connectors on the sensor fiber extension into the other sides of the
bulkhead connectors, and the duplex connector into the back of the 350 relay.