Various embodiments of the teachings herein include methods for determining the state of an electrical switchgear assembly. The method may include: measuring an electric current and a voltage dropped across the switchgear assembly; ascertaining a time interval of an arc occurring during a switching operation; comparing the ascertained time interval to a reference value specific to the switchgear assembly; measuring a voltage profile during the time interval; and comparing the voltage profile with a reference voltage profile. The time interval begins when the value of the measured voltage exceeds a first threshold value. The time interval ends when the value of the current intensity falls below a second threshold value.

Various embodiments of the teachings herein include methods for determining the state of an electrical switchgear assembly. The method may include: measuring an electric current and a voltage dropped across the switchgear assembly; ascertaining a time interval of an arc occurring during a switching operation; comparing the ascertained time interval to a reference value specific to the switchgear assembly; measuring a voltage profile during the time interval; and comparing the voltage profile with a reference voltage profile. The time interval begins when the value of the measured voltage exceeds a first threshold value. The time interval ends when the value of the current intensity falls below a second threshold value.

Aspects herein are directed to an electrical system enclosure. The electrical system enclosure can include an electrical housing unit that includes one or more electrical components. The electrical system enclosure can further include a receptacle coupled to an outside surface associated with the electrical housing unit. The receptacle may be configured to engage a connector component of a cable. The electrical system enclosure can further include a contactor within the electrical housing unit. The contactor may be configured to energize based at least in part on the receptacle engaging the connector component. The electrical system enclosure may include an energy supply component configured to cause energy to be transmitted through the receptacle and the cable to a device outside of the electrical housing unit based on the contactor energizing.

Aspects herein are directed to an electrical system enclosure. The electrical system enclosure can include an electrical housing unit that includes one or more electrical components. The electrical system enclosure can further include a receptacle coupled to an outside surface associated with the electrical housing unit. The receptacle may be configured to engage a connector component of a cable. The electrical system enclosure can further include a contactor within the electrical housing unit. The contactor may be configured to energize based at least in part on the receptacle engaging the connector component. The electrical system enclosure may include an energy supply component configured to cause energy to be transmitted through the receptacle and the cable to a device outside of the electrical housing unit based on the contactor energizing.

An apparatus provides a single split-bus electrical panel with a first panel section that supplies power to non-critical loads and a second panel section to supply photoelectric power to critical loads. A patch panel associated with the split-bus electrical panel is configured to enable an installer to selectively connect factory installed connections to either: (1) connect each panel section directly to utility power for full utility power to both panel sections; (2) alternately to connect the second panel section to the utility power via a microgrid interconnection device when the second panel section is presently at least partially powered by back-up photovoltaic power, or (3) alternately connect both panel sections to full back-up photovoltaic power.

An apparatus provides homeowner selectable full or partial back-up power of a residential photovoltaic system to power critical loads during a utility power outage. A single split-bus electrical panel with a first panel section supplies utility power to non-critical loads and a second panel section supplies photovoltaic power to critical loads. A mechanical interlock in contact with interlocked circuit breakers of the first panel, prevents them from both being simultaneously on. A patch panel associated with the split-bus electrical panel enables an installer to selectively connect factory installed connections to either: connect the second panel section to utility power via a microgrid interconnection device when the second panel section is at least partially powered by back-up photovoltaic power, or connect the first panel section through one of the interlocked circuit breakers to utility power via the microgrid interconnection device to provide both panel sections with full back-up photovoltaic power.

An apparatus provides a single split-bus electrical panel with back-feed circuit breakers arranged to allow connection of a Microgrid Interconnection Device (MID) for isolation of a critical loads section from a standards loads section during back-up operation due to a utility power outage. A first panel section of the split-bus electrical panel supplies power to non-critical standards loads in a residence. A second panel section of the split-bus electrical panel supplies power to critical loads in the residence, which must continue to be powered during a utility power outage.

A switchgear or control gear includes: at least one first compartment; at least one second compartment; a plurality of main switchgear or control gear components including a main busbar system, a three position linear or rotational movement disconnector, a circuit breaker, and at least a first part of an insulated cable connection; and a plurality of auxiliary switchgear or control gear components including a disconnector drive and a circuit breaker drive. The plurality of main switchgear or control gear components are housed in the at least one first compartment. The plurality of auxiliary switchgear or control gear components are housed in the at least one second compartment. When one or more of the plurality of main switchgear or control gear components is energized, the at least one first compartment is hermetically sealable or maintainable at an internal air pressure greater than ambient air pressure.

A switchgear or control gear includes: at least one first compartment; at least one second compartment; a plurality of main switchgear or control gear components including a main busbar system, a three position linear or rotational movement disconnector, a circuit breaker, and at least a first part of an insulated cable connection; and a plurality of auxiliary switchgear or control gear components including a disconnector drive and a circuit breaker drive. The plurality of main switchgear or control gear components are housed in the at least one first compartment. The plurality of auxiliary switchgear or control gear components are housed in the at least one second compartment. When one or more of the plurality of main switchgear or control gear components is energized, the at least one first compartment is hermetically sealable or maintainable at an internal air pressure greater than ambient air pressure.

A busbar system includes a busbar with at least two parallel arranged phase conductors running between a first end and a second end of the busbar and at least two feeders connected onto the busbar, each feeder including contacts for at least some of the phase conductors of the busbar; a first supply line and a second supply line interconnecting the first feeder and the second feeder with a common power supply; wherein a first feeder of the at least two feeders is connected onto the first end of the busbar and a second feeder of the at least two feeders is connected onto the second end of the busbar; wherein each of the first supply line and the second supply line has a higher impedance than the busbar.