Modified differential ground fault protection for systems having multiple sources and grounds

The modified differential ground fault protection system is discussed for the purpose of illustrating that: such systems are suitable for application on service equipment having multiple sources of electrical power, each of which may have multiple grounds; such systems may be applied using conventional equipment that is currently available from several suppliers; such systems can meet requirements for generator grounding without the use of four-pole transfer switches and switched neutrals; and such systems may be analyzed for effectiveness using conventional circuit analysis techniques