Section 15: Abbreviations & Acronyms
InSpec Remote I/O HUB (ATEX, IECEx)
36
Abbreviations & Acronyms
ABBREVIATIONS & ACRONYMS
AC -
Alternating
Current
DC -
Direct
Current
GND
- Ground (0V DC)
I/O -
Input
or
Output
IEC
- The International Electrotechnical Commission
LED -
Light-Emitting
Diode
PE -
Protective
Earth
Pollution -
Addition of foreign matter, solid, liquid or gaseous (ionized gases), that may produce a
reduction of dielectric strength or surface resistivity.
PSU -
Power
Supply
Unit
PTC -
Positive
Temperature
Coefficient
SELV
- Safety Extra-Low Voltage circuit
An SELV circuit is defined as a circuit that is so designed and protected that under both
normal and single fault conditions, its voltages do not exceed a safe value.
Under normal conditions, the voltage of such a circuit cannot exceed 33 V rms and 46.7 V
peak or 70 V DC In the event of a single fault, the voltage cannot exceed 55V rms and 78 V
peak or 140 V DC.
SSR
- Solid State Relay
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