Well here are some of the more common ones you may encounter, many with links to other posts:
3ph – Three Phase Power
AC – Alternating Current
ACU – Air Conditioning Unit
CB – Circuit Breaker
DC– Direct Current
DH – Ducted Heating Unit
DIM – Dimmer
DGPO – Double General Power Outlet
ECU – Evaporative Cooling Unit
ELCB – Earth Leakage Circuit Breaker
GPO – General Power Outlet
IP – Ingess Protection. Range from a basic IP 30 (standard outlet) to IP67 (fittings to withstand total immersion in water)
JB – Junction Box
LV – Low Voltage
LED – Light Emitting Diode
HW– Hot Water Unit
M – Meter
MSB – Main Switchboard
RA -Return Air (from Ducted Heating/Air Conditioning)
RCD – Residual Current Device
RF – Roof Access
SB – Switchboard
S – Sensor
SEN – Sensor
WP – Weather Proof
See Jargon for more posts