Installation & communications

Installation, lighting, communication and network symbols used in switchrooms and supporting electrical systems. Explore 12 references, with original explanations and public primary sources.

Q020501

Unidirectional propagation qualifier

This qualifier indicates a signal or propagation path with one documented direction.

IEC

Q020502

Simultaneous bidirectional propagation qualifier

This qualifier distinguishes a path supporting propagation in both directions at the same time.

IEC

Q020503

Alternating bidirectional propagation qualifier

This qualifier identifies opposite-direction propagation occurring alternately.

IEC

Q020504

Signal-transmission qualifier

A transmission qualifier identifies the sending role of a signal interface.

IEC

Q020505

Signal-reception qualifier

A reception qualifier identifies the receiving role of a signal interface.

IEC

Q020901

Non-ionising radiation qualifier

This qualifier identifies the publisher's non-ionising radiation family, with the radiation role stated in the device description.

IEC

HAN1B7

Loudspeaker annunciation

A loudspeaker indication identifies conversion of an electrical signal to an audible output.

IEC

HAN1B8

Combined loudspeaker and microphone

This representation identifies an electroacoustic device serving loudspeaker and microphone roles.

IEC

HAN1B9

Microphone input

A microphone indication identifies an acoustic-input transducer in a communications circuit.

IEC

HCN1RSGL

Single power receptacle

This form identifies a single power receptacle connection in the publisher's installation family.

IEC

HCN1RDUP

Duplex power receptacle

This form distinguishes a duplex receptacle arrangement.

IEC

HC01WR_1-

One-line power receptacle

A one-line receptacle represents a power outlet within a simplified circuit view.

IEC