Intrinsic safety and explosion protection
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What do the letters ia or ib in the explosion protection rating of intrinsically safe instruments mean, and what is their full English name? What does d represent in explosion-proof instruments?
There is a lot of information on intrinsically safe and explosion-proof concepts on forums; you can search for it first. For reference: Instrument intrinsically safe explosion-proof technology at http://bbs.hcbbs.com/thread-222834-1-9.html, as well as http://bbs.hcbbs.com/viewthread.php?tid=63978&page=1#pid250630. These are information points on explosion protection found on the Internet, which include explanations of intrinsically safe categories IA and IB. Applicability of explosion protection methods in hazardous areas: Serial number, Explosion protection type, Code, **Standard, Explosion protection measures, Applicable areas: 1. Flameproof type, d, GB3836.2 – Isolate existing ignition sources; Zone1, Zone2. 2. Increased safety type, e, GB3836.3 – Prevent the occurrence of ignition sources; Zone1, Zone2. 3. Intrinsic safety type, ia, GB3836.4 – Limit the energy of ignition sources; Zone0-2. Intrinsic safety type, ib, GB3836.4 – Limit the energy of ignition sources; Zone1, Zone2. 4. Positive pressure type, p, GB3836.5 – Separate hazardous substances from ignition sources; Zone1, Zone2. 5. Immersed oil type, o, GB3836.6 – Separate hazardous substances from ignition sources; Zone1, Zone2. 6. Sand-filled type, q, GB3836.7 – Separate hazardous substances from ignition sources; Zone1, Zone2. 7. Spark-free type, n, GB3836.8 – Prevent the occurrence of ignition sources; Zone2. 8. Sealed type, m, GB3836.9 – Prevent the occurrence of ignition sources; Zone1, Zone2. 9. Airtight type, h, GB3836.10 – Prevent the occurrence of ignition sources; Zone1, Zone2. Last edited by Free Dust on 2009-2-4 16:41.]
Ib intrinsically safe circuits must ensure that the circuit components do not catch fire or explode, both when the circuit is operating normally and in the event of a fault within the system. Intrinsic safety circuits require that components do not catch fire or explode under normal operating conditions as well as in the presence of two faults. Explosion-proof electrical equipment (d): refers to electrical equipment in which the components that could ignite explosive mixtures are enclosed within a housing capable of withstanding the explosion pressure from such mixtures and preventing the spread of explosion to the surrounding explosive mixtures.
What I mean is, what do the letters IA and IB in intrinsically safe systems represent? Are they English abbreviations?
i is the first letter of the English word intrinsic, and a and b represent two levels.