GE Industrial Solutions CPS3200U - Manual (Page 28)

CPS3200U Upstream System – 23” Product Manual CPS3200U
CC848779826 r09 December 2013 28
7 Inspect the Network - Check and Mark Wiring
Compliance
The CPS3200U +/-190V 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.
To meet UL60950-21 specific procedural steps must be taken at the time of installation. This section goes through those
steps. These steps should be performed 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 QS982A 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 QS982A 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 chassis of the system bonded to ground? Verify by both observation and
measurement before powering the system. Measurement from the exterior of the
CPS3200U 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 value of 10 ohms.
7. Test each circuit by powering an open circuit at the remote end of the wire with a QS982
output. If red lights do not flash, there is no leakage path to ground at operating voltage.
If the FLT light does not blink yellow, there is no hard short between tip and ring.