9
INM MTL SUM5 Rev 1
Figure 4.3
- Tagging strips in use
4.5 Carrier earth protection
All carriers must be earthed. Each carrier has a surge-ground screw, located to the rear of
the alarm module – see Figure 4.4 below.
Figure 4.4
- Surge ground terminal – shown circled
This terminal is used to carry the surge current to ground if surge protection modules are
used on the carrier. In these circumstances, it MUST be connected via a low impedance
path to the plant ground. It is recommended that a cable with a cross-sectional area of
at least 4mm
2
, and a ring terminal be used to connect this screw terminal to the plant
grounding bus.
Tag holder and strip
position with
surge-protection
module
Regular position
for tag holder
and strip
195 mm
POWER
V1 V2 0V 0V
PWR1 PWR2
FS1
2.5A-m
2.5A-m
FS2
1A 1B 2A 2B
ALARM
1
2
15
16
A B C A B C A B C A B C A B C A B C A B C A B C
180 mm
138 mm
215 mm
138 mm
