Ex-pert Electrical Technologies
Dynamic elaboration on the Art & Science of Hazardous Area Protection
Intrinsic Safety
Name of the Safety Technique : Intrinsic Safety
Guidelines : IEC 60079-11
Type of protection based on the restriction & limitation of electrical energy within apparatus and of interconnecting wiring exposed to the potentially explosive atmosphere to a level below that which can cause ignition, by either sparking or heating effects.
Symbol: i
| Type of Ignition Protection | Abbreviation | Region | Classification | Specification/Standard |
| Intrinsic Safety | IS) | US | Class I, Division 1 | FM 3610 |
| Intrinsic Safety | (IS) | CA | Class I, Division 1 | C22.2 No. 157 |
| Intrinsic Safety | AEx ia | US | Class I, Zone 0 | FM 3610 |
| Intrinsic Safety | AEx ib | US | Class I, Zone 1 | FM 3610 |
| Intrinsic Safety | Ex ia | CA | Class I, Zone 0 | CSA E60079-11 |
| Intrinsic Safety | Ex ib | CA | Class I, Zone 1 | CSA E60079-11 |
| Intrinsic Safety | Ex ia (EEx ia) | EU | Zone 0 | EN 50020 |
| Intrinsic Safety | Ex ib (EEx ib) | EU | Zone 1 | EN 50020 |
| Intrinsic Safety | Ex ia | IEC | Zone 0 | IEC 60079-11 |
| Intrinsic Safety | Ex ib | IEC | Zone 1 | IEC 60079-11 |
The underlying philosophy (In simple words): The POWER (I²R & VxI) is reduced from the electrical parameters to a very low value of about 25 milliWatts. Logically it is only possible in control & monitoring circuits and not for the POWER circuits.
Application
- Integration of Field Devices (Instrumentation & process control)
- Connection of components for automation technology
- Safety barriers
- Isolators
- Remote Input / Out put
- Combination of Human Machine Interface (HMI) with machine control system
Ex-pert Electrical Technologies 