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Sources of Electrical Disturbances Electrical disturbances can arise from a number of sources, but there are five basic types which the protection engineer must design safeguards against: 1. Lightning: Lightning is one of nature’s most powerful and destructive sources of electrical energy. Individual discharges can generate 100’s of thousands of volts and deliver greater than 300 6 thousand amps. 2. Power Line Contact: Intense wind and ice storms often result in downed power lines. If a power line falls on communications cables, it has the potential to send current directly through the cable to the end-user’s equipment. 3. Induction: Power lines, induction motors, ballasts, switching power supplies and other sources of electro-magnetic interference are able to induce surges in communications cables that run in close proximity. These indirect disturbances are often very difficult to trace and can be just as damaging as lightning or direct contact. 4. Power Faults: Power faults are most often associated with faulty neutral and/or grounding. In most buildings, the telephone company’s ground or neutral is bonded to the power company’s neutral. If current is introduced into this neutral by any means such as unbalanced phases, harmonics or wiring faults, it will likely be transferred to the telephone lines into your equipment. 5. Electrostatic Discharge: This type of electrical disturbance is most common in dry climates. The build-up of “static” electricity and its resultant discharge is very similar to the physics that produce lightning discharges. Although it’s total energy discharge is on a vastly different scale, it is more likely that this type of current will come in contact with your sensitive electronics than any other type of discharge. Today, with the huge installed base of sophisticated telecom electronics and customer premise equipment, it is even more important that superior protection is built into the physical plant. Circa Telecom supplies products designed specifically to safely divert the destructive forces of electrical disturbances before they can do damage to equipment. www.circamax.com


19385CT
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