High voltage isolation for analogue lines in a compact sealed unit
Standard electrical protection methods, such as gas tubes or solid-state devices are ineffective in protecting equipment from Ground Potential Rise. These devices are normally placed at each end of a communications network and are designed to direct foreign voltage impulses into a grounding system.
During a ground potential rise, these devices merely offer an additional path to remove ground references, and actually provide a path for current to flow in the reverse direction from which they were intended to operate. The only effective protection scheme against Ground Potential Rise is an Isolation device.
Kenton understand what is required to design and implement a safe and effective protection scheme, and have been providing isolation devices into major telecommunications companies for over 10 years.
Kenton manufacture a range of Wire-Line isolators that use state-of-the-art technology to isolate and protect telephone facilities and personnel from the hazardous voltages associated with Ground Potential Rise. The wire-line isolator breaks the copper continuity of the communication line as it enters the building, thus eliminating the conductive bridge. It acts as a dam between the site and exchange, whilst allowing all of the communication signals to pass through transparently but preventing any fault currents from passing onto the lines.
Key Take Aways
- ISOLATION: 20kV AC
- CHARACTERISTICS TO LINE:
- Impedance BS complex
- Input volts 10 to 60V DC
- Idle current <200μA
- Active current 8 to 50m
- Ring detect 30V, 25 to 50HzNominal impedance 135 ohms
- CHARACTERISTICS TO EQUIPMENT
- Impedance BS complex
- Open circuit feed volts 50V DC
- Off-hook detect 8mA
- Ringing volts o/c 50V RMS, 25Hz
- DIRECT EXCHANGE LINE TYPE & FEATURES:
- Loop calling
- Earth calling
- Prepay payphone
- 50Hz meter pulses
- DTMF dialing
- Pulse dialing
- 207 to 253V AC, 30mA and/or
- 40 to -60 V DC, 80Ma
- SPEECH LEVEL:
- INSERTION LOSS
- Selectable 1dB or 3dB
- FREQUENCY RESPONSES:
- +/- 1dB 300 to 3300Hz
- 225 x 180 x 60mm
- • 1 kg
- MEETS THE REQUIREMENTS OF:
- EMC Directive 89/336/EEC: emissions to BS EN 55022: 1998 class B, immunity to BS EN 55024: 1998.
- Low Voltage Directive 73/336/EEC: safety to BS EN 60950: 1998
- BT Spec. D2966C
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