2-13
TI545/TI555 System Manual
Pre-installation Guidelines
2.8 Power System Grounding
In
some installations, a metal conduit that connects to the neutral phase at
the circuit-breaker box supplies the earth ground of the power receptacle.
Depending on site conditions, this metal conduit may conduct current from
other sources that can interfere with the operation of the equipment.
T
o reduce this possibility
, isolate earth ground and neutral from the conduit
(except at the service entrance housing); see Figure 2-8. Ensure that system
power is wired in accordance with National Electrical Manufacturers
Association specifications. Also comply with the following:
•
Ensure that the protective ground wire resistance is less than 0.1 ohm.
•
Ensure that the resistance to earth ground is 0.1 ohm or less.
Conduit Conduit
Protective
Ground
Circuit
breaker
panel
TI545/TI555
Base
power
supply
AC line
AC neutral
Ground
Service
entrance
Power
company
transformer
Power
company
earth ground
Earth
ground rod
Figure 2-8 Isolating
Gr
ound and Neutral Fr
om Conduit
Earth Gr
ound
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