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| Impedance Grounded Systems https://brainfiller.com/arcflashforum/viewtopic.php?f=33&t=5441 |
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| Author: | Jim Phillips (brainfiller) [ Sun Apr 18, 2021 9:08 am ] |
| Post subject: | Impedance Grounded Systems |
The majority of faults begin as a phase-to-ground event. Systems that use a grounding impedance such as a neutral grounding resister can greatly reduce the ground fault current to a very low value. These currents are typically 5 to 10 amps for high impedance grounding at lower voltages and a few hundred amps with low impedance grounding at higher voltages. Reducing the current to such low levels can prevent a single phase arc flash from escalating into a three phase arc flash. Here is this week's question: Does your facility (or clients) use impedance grounding? No It Depends - We have a mix of sites/clients Yes - our site uses impedance grounding Doesn't apply |
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