USCG Exam PracticeSwitchboards and distribution systems
Under 46 CFR §111.05-17(b), the ground connection of the neutral in a grounded generation and distribution system must be accessible for what specific purpose?
- A. To allow the ground fault current to be measured while the generator is on the bus
- ✓ To permit checking the insulation resistance of the generator to ground before the generator is connected to the busCorrect
- C. To allow the neutral to be isolated from ground when paralleling two generators
- D. To permit the overcurrent device in the neutral to be tested under load conditions
Why B is correct
46 CFR §111.05-17(b) specifically requires the ground connection to be accessible for checking the insulation resistance of the generator to ground before the generator is connected to the bus. This allows a megger test to be performed to verify the generator winding insulation integrity prior to paralleling.
Cited:46 CFR §111.05-17