Specifications

The surge protector consists of two sections: the terminal block and the main assembly. These sections separate
to make the unit easier to install and replace (Figure 24).
Figure 24: Sections of Surge Protector
The surge protector is wired depending on which device requires protection. Follow these general steps:
1. Mount the Transient Eliminator device per local codes. Install in an enclosure (if required) as close as possible
to the first MS/TP device connecting the trunk segment entering the building. Any electrical box with a cover is
acceptable. Bond the transient eliminator enclosure to the MS/TP device enclosure by connecting the two with
the conduit that carries the MS/TP cable.
2. Connect the MS/TP segment from the outside to the unprotected side of the device. If possible, run the segment
inside metallic conduit because the conduit acts like a shield for lightning.
3. Connect the MS/TP segment that goes to the MS/TP device to the protected side of the device. Keep this segment
away from the unprotected segment.
4. Connect the protector to earth ground with 12 AWG stranded green wire (Figure 23). The total length of ground
wire cannot exceed 4.57 m (15 ft), which means an earth ground must be available within 4.57 m (15 ft) of the
MS/TP device. (Your installation design must accommodate this requirement.)
5. For hard ground installation, connect the shield to Pin 9. For soft ground installation, connect the shield to Pin
7.
For more details on installation, refer to the specific manufacturer’s literature.
46MS/TP Communications Bus Technical Bulletin: Appendix: FC Bus Auxiliary Devices