SHVD
Switchroom high-temperature ventilation demand
Generates a ventilation request from the monitored room-temperature condition.
Functional block
Electrical symbols.
Explore electrical symbols, functional blocks and circuit arrangements for switchgear, switchrooms, substations, switchyards and microgrids. Detailed explanations, drawing notes, public sources and original SVG/DXF illustrations.
Switchrooms
SLVR
Switchroom low-temperature ventilation restraint
Restrains the specified ventilation action when the room reaches its defined low-temperature condition.
Functional block
DVFS
Duty-standby ventilation fan selection
Assigns the available room ventilation fans to the documented duty and standby roles.
Functional block
VFAC
Ventilation fan automatic changeover
Transfers the documented ventilation duty when the active fan becomes unavailable.
Functional block
SFRI
Switchroom fan run-proof interface
Checks the feedback that confirms a commanded fan is operating.
Functional block
SAA
Switchroom airflow-failure alarm
Reports missing or inadequate airflow under the documented supervised ventilation condition.
Functional block
VDA
Ventilation-filter differential-pressure alarm
Reports the defined pressure-difference condition across the monitored ventilation filter.
Functional block
MIC
Motorised intake-damper command
Requests the intake-damper position needed by the selected room operating mode.
Functional block
IOG
Intake-damper open-proof gate
Uses the intake-damper feedback as a condition of the assigned ventilation operation.
Functional block
VOS
Ventilation outlet-damper supervision
Monitors the documented exhaust-damper position against the ventilation request.
Functional block
SFLI
Switchroom fan local-auto interface
Selects the permitted local or automatic command path for the room fan.
Functional block
ECR
Enclosure condensation-control request
Initiates the documented heater or conditioning action for condensation management.
Functional block
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Read the drawing, not just the mark
Small details. Different meanings.
Understand symbols, equipment tags and function numbers—and know when a generic object needs a manufacturer drawing.
In plain English
What do electrical symbols tell you?
Electrical symbols are shorthand for equipment, functions and connections. They let you follow how a circuit works without drawing every physical detail.
A simple example
On a microgrid single-line diagram, a current-transformer symbol marks a measurement point and a breaker symbol marks where a circuit can be disconnected. Their labels identify the actual equipment.
What the drawings help you do
Follow the connected lines to trace power or control signals. Use the project legend to interpret symbols and the selected manufacturer's drawings for dimensions and terminal connections.
- Single-line diagram
- A simplified power-system drawing that often uses one line to represent a three-phase circuit.
- Legend
- The key explaining a drawing's symbols and labels.