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| No, the risk that grounding reduces is fire, but it increases the risk of electrical shock. On an ungrounded system, since there isn't a path ground back to the system when there is a fault, a person touching the component that became 'live' does not become part of the circuit allowing current to go through them to ground.
If a system is grounded, and there are shorts to components that are not grounded or bonded, when you touch them, you can become part of the circuit. That is why GFCIs are so important, and part of the code.
Seperately derived systems can be grounded, but often dont need to be grounded.
If your generator gets hit by lightning, it is going to be toast either way.
Even in industry, ungrounded systems that aren't seperately derived are common when loss of power due to a fault would very expensive. A system can have a fault without tripping the power like a grounded system, but they need to be monitored for faults so they can be fixed before a second fault occurs.
The National Electrical Code is written by the National Fire Protection Association, since fires were very common in the early days of electricity. Grounding is mainly to prevent fires. With that fire protection comes a higher risk of shock. NFPA 70 (NEC) requires all kinds of rules to both make sure grounding fullfills its purpose and mitigate the risks that come with grounding. | |
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Anyone knowledgeable about electric grounding on trailer mounted generator?
