what is intrinsically safe

• Intrinsic safety is to ensure that the available electrical and thermal energy in the system is always low enough that ignition of the hazardous atmosphere cannot occur. 
• This is achieved by limiting voltages and currents that enters the hazardous area, and that all electric supply and signal wires are protected by Zener safety barriers.
• Sometimes an alternative type of barrier known as a galvanic isolation Ex- Walkie talkie, Two Radio communication equipment.