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E. Technical symbols

Symbol Description Symbol Description Symbol Description
Lightning equipotential bond- Equipotential bonding bar PE conductor
ing; lightning current arrester
Local equipotential bond-
ing; surge arrester Fuse (general) N conductor
Lightning equipotential bond- Resistor; decoupling
ing; TYPE 1 lightning current element (general) PEN conductor
arrester of the Yellow/Line
Local equipotential bond-
ing; TYPE 2 - 4 surge ar- Variable resistor Earth (general)
rester of the Yellow/Line
Local equipotential bond-
ing; TYPE 2 - 4 surge ar- Variable thermistor Test joint
rester of the Yellow/Line
Local equipotential bond-
ing; surge arrester (type 2 Diode Junction
SPD, type 3 SPD)
Lightning current arrester Light-emitting diode (LED) Connecting clamp
for use in hazardous areas

Surge arrester for use in Bidirectional Motor
hazardous areas avalanche diode
Combined arrester for power
supply and information tech- Capacitor Generator
nology systems
Medium-voltage arrester Signal lamp Temperature sensor

Isolating spark gap Transformer Socket and plug

Inductor Socket outlet
Varistor
(reactor, winding, coil) with earthing contact
Gas discharge tube Enclosure Antenna socket

LifeCheck arrester testing Meter Switch / button

Lightning protection zone Inverter Fuse disconnector
Potentially explosive
atmosphere PV module Circuit breaker
Single-pole representation
Hazardous area Shielded cable of the conductors by means
of a number / lines

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