MC404-Z
Document Version: 1.05
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27
Distributed power supply
If the device is connected to a distributed power supply or the cable length between the
power source and the device is longer than 3 metres, then a surge protection device must be
fitted to comply with the CE EMC directive.
Distributed power supply with surge protection
Surge protection device
Protection device - Minimum specification
Operating Voltage
24V dc
Suppression Begins:
Stage Two
Stage Three
30V
35V
Max. Clamp Volts for transients on the line:
Stage Two
Stage Three
65V
77V
Surge Current (8/20mSec Pulse)
+ to -
+ to Earth
- to Earth
9000A
4000A
4000A
Surge Energy (2mSec Pulse)
+ to -
+ to Earth
- to Earth
94 Joules
44 Joules
44 Joules
Response Time
<5 nsec
Resistance to Earth:
Max Over-Voltage
Operating Voltage
0.01 Ω
> 1 MΩ