Component Guide

Planning an Ensemble Technology System – North America

Glossary

distributed energy resource (DER): A source of electric

power that is not directly connected to a bulk power system.

DER includes both generators and energy storage

technologies capable of exporting active power to an EPS. An

interconnection system or a supplemental DER device that is

necessary for compliance with this standard is part of a DER.

(IEEE 1547-2018)

intentional island: An intentionally planned electrical island

that is capable of being energized independently of the area

electric power system (EPS). Enpower and Encharge

comprise a microgrid system that forms an intentional island

totally within the bounds of the Local EPS. (2017 NEC/IEEE

1547-2018/IEEE 1547.1-2011)

main load panel: Also referred to as the main load center or

main panelboard, this is the unit where the majority of load

circuits for the premises have over current protection.

microgrid interconnect device (MID): A device that allows a

microgrid system to separate from and reconnect to a primary

power source. (NEC 705.2)

microgrid system: A premises wiring system that has

generation, energy storage, and load(s), or any combination

thereof, that includes the ability to disconnect from and

parallel with the primary source. (NEC 705.2)

multimode inverter: Equipment having the capabilities of both the interactive inverter and the stand-alone inverter.

(NEC 705.2)

service: The conductors and equipment for delivering electric energy from the serving utility to the wiring system of

the premises served. (NEC CMP-4)

service equipment: The necessary equipment, usually consisting of a circuit breaker(s) or switch(es) and fuse(s)

and their accessories, connected to the load end of service conductors to a building or other structure, or an

otherwise designated area and intended to constitute the main control and cutoff of the supply. (NEC CMP-4)

voltage regulation: The measure of change of voltage magnitude in a component such as a feeder. Poor voltage

regulation may result in unwanted behavior such as dimming lights or flicker.