IfcElectricCurrentEnum

ALTERNATING: Alternating current (AC).
DIRECT: Direct current (DC).
NOTDEFINED: Undefined electrical current.

Definition from buildingSMART: This enumeration defines the different types of available electrical current:

HISTORY: New enumeration in IFC R2.0

EXPRESS specification:

TYPE IfcElectricCurrentEnum = ENUMERATION OF

(	ALTERNATING, DIRECT, NOTDEFINED);

END_TYPE;