GE Industrial Solutions CPS2400U - Manual (Page 16)

CPS2400U Upstream System – 19” Product Manual CPS2400U
850028186 r04 December 2013 16
Inspect the Network
Check and Mark Wiring Compliance
The system is classified as an A2 circuit tested according to GR-1089-CORE Issue 3. As such, each location in the
network where the output is available to be touched must be protected and marked as an A2 voltage.
Step Action
1. Is accessibility to the circuit throughout the network consistent with A2 requirements?
2. Is the 5-pin protector marked as a special circuit?
3. Does the 5-pin protector protect each pair to a level corresponding to a CommScope 3C*EW Gas tube
primary protector?
This protector has a voltage breakdown range of 265-465 Volts and an impulse spark over range of
<265-700 Volts. Protectors with a lower voltage breakdown rating will be problematic.
Verify UL Installation Compliance
• This verification is required at the time of installation to meet UL60950-21.
• Perform this verification before power is distributed in the network.
Normally the final step is performed by closing the circuit using a 5-pin protector after DC power is applied to the
system.
Step Action
1. Recognize that the Remote Feed Telecommunication Voltage limited (RFT-V) circuit is voltage limited to
+190V and -190V from ground.
2. Is the total capacitance to ground on each line of the circuit less than 10μF?
The QS982 introduces 4.4μF. The remote electronics and line must introduce less than 5.6 μF of
capacitance. .
3. Is the total capacitance line to line of the circuit less than 40μF?
The QS982 introduces 2.2μF. The remote electronics and line must introduce less than 37.2 μF of
capacitance from tip to ring.
4. Is the remote equipment also a RFT-V voltage limited circuit?
Both ends of the circuit must be designed to the same standard. This must be verified before the
equipment is connected together.
5. Is the voltage rating of the Network Wiring sufficient to support 190V to ground?
6. Is the wire between the converters and primary protectors minimum 26AWG 200V rated?
7. Is the chassis of the system bonded to ground?
Verify by both observation and measurement before powering the system. Measurement from the
exterior of the Converter Shelf to the cabinet ground bus should indicate continuity as determined via a
meter providing an audible beep or the standard method of continuity verification used in the network.
Many network providers use a maximum value of 10 ohms.