Electrical Safety and Protection Technologies
| POWERSERVE
Electrical Safety and Protection Technologies
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LEAKAGE CURRENT and SYSTEM IMPEDANCE MEASUREMENTS Leakage current and system impedance relate very directly to the level of "isolation" present in an Isolated Power System. Every IPS system has some level of leakage current inherent in the IPS panel, the branch circuit wiring, receptacles and switches. However, the more leakage current that exists within the IPS system, the less leakage current that can be "tolerated" within the Operating Room in terms of portable, plugged-in medical equipment. For this reason, NFPA 99 sets limits on inherent system leakage current. Or stated another way, NFPA 99 requires that the IPS system must have an impedance of 200,000 ohms or greater between each phase conductor and ground. In both New Installation Testing and Periodic Testing, POWERSERVE takes system and branch circuit leakage readings, then calculates the system's overall impedance level. This data is recorded in the Final Report. In New Construction, if the leakage current is too high (and system impedance is too low) POWERSERVE will work diligently with the installing electrical contractor to determine the cause and the corrective action. |
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