Ground Bus - Toshiba LC531 Series Instruction Manual

2.5.3

Ground bus

■ Connecting two or more controllers within a room to the ground bus
To connect two or more controllers within a room to a ground bus, attach
lead-in terminals to the ground bus, or use bolt connectors as shown in
Figure 2-14. Do not connect one ground bus sequentially. Be careful so that
the grounding conductor does not form a loop.
● Use a grounding wire 1.25mm
terminal of each cabinet to the common bus.
● The gauge of the ground bus must be 8mm
Cabinet Cabinet
to LC53* to LC53*
Ground bus
Figure 2-14 Example of connecting grounding wire to ground bus
Note
• Never connect any equipment other than this system to the ground bus.
■ Grounding controllers installed at separate locations
When controllers are not installed in the same room, ground each of them to
one ground point at each installation site as shown in Figure 2-15.
Grounding
electrode with
100Ω max
resistance
Figure 2-15 Example grounding of controllers installed at separate locations
Cabinet Cabinet
to LC53* to EC3**
1.25mm
Grounding
Bolt connector
electrode with 100Ω
max resistance
EC bus
Cabinet Cabinet
to LC53* to LC53*
2
1.25mm 1.25mm
Grounding
electrode with
100Ω max
resistance
Unified Controller nv Series Single-Loop Controller LC531/LC532 Instruction Manual
2
(AWG#8) to connect the grounding
2
(AWG#8) or greater.
Cabinet Cabinet
to LC53* to LC53*
2
Lead-in
terminal
2
22mm
Ground bus
Cabinet Cabinet
to LC53* to EC3**
2 2
1.25mm
Grounding Grounding
electrode with electrode with
100Ω max 100Ω max
resistance resistance
2.5 Grounding
Cabinet
to LC53*
2
1.25mm
2
22mm
Grounding electrode
with 100Ω max
resistance
2
1.25mm
39