These configurations include the following: There are several hardware configurations and applications that are more subject to damage from ESD events.
The fast rise time of the EFT pulses demand similar protection as ESD pulses.ĬONFIGURATIONS THAT ARE SUBJECT TO SURGE EVENTS Like ESD, EFT can be especially fatal on data and I/O lines. The electro-mechanical switches are used to connect and disconnect inductive loads. A good equipment chassis protective ground is strongly recommended to assure adequate protection.ĮFT disturbances occur as a result of arcing contacts in electro-mechanical switches and relays commonly found in an industrial environment. The Cisco surge protection cable will adequately prevent this transient damage from occurring to within the industry standards for lightning protection devices. A normal event may be 10 usec zero to peak, with a decay of 200 usec. When they occur on the power line outside of the facility peak currents can be extended in time due to the additional inductance of the power line. These events can occur both at the facility as well as outside the facility along utility power lines. During a direct lightning strike it is possible to measure peak currents into the Kilo Amp range. These lightning events cause differential voltages to develop as a result of inductance in the protective earth ground path to the equipment. Lightning also can create a large disturbance and delivery destructive energy to the equipment. Should the input to the device not be protected from this ESD threat, as little as 100 milli-Joules can cause permanent failure to an input device at the silicon die level. These are the peak current of the discharge and the resulting electromagnetic field. There are two primary threats from an ESD event. This discharge can represent several thousand volts at 10 to 30 amps of current. In a normal equipment environment there are reasonable threats from Electrostatic Discharge (ESD) and lightning transients which can cause loss of data integrity and permanent damage to equipment if not controlled.ĮSD threats are generated by personnel movement, which causes triboelectric (rubbing causing a separation of charge) charges to accumulate on equipment or clothing and then be discharged through hand or tool "touch".