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Posted By Topic: Hazardous Equipment in Zones

jasmoon123
Sep 23 2019 21:14

Hi,

In a Hazardous area what is the link or connection is between Zones and the Protection Type.

The equipment has Ex nR DIP IP66 marked on it.
Is the equipment rated for Zone 20,21 or 22?
I assume the Protection Type is linked somehow to the Zone?

Thanks

   

AngryClient
Sep 25 2019 09:38

ExnR should be avoided as a protection technique (while sensible in theory, near impossible to install correctly and even harder to maintain over any period of time).

Also more information is needed to answer this question.
   

mrsparky
Sep 25 2019 09:39

AS/NZS 60079(.14) series has all the information you need.. Including the competency requirements of the people to carry out the work.

To be honest if you dont know the answer to this question you shouldn't be touching the equipment without training.
   

jasmoon123
Sep 26 2019 19:52

Hi AngryClient, it is too late for me with regards to selection of equipment.
For your reference (and to others) the information is sufficient to deduce a Zone. The relevant clauses are around ASNZS60079.14:5.3 - Relationship between Equipment Protection and Zones.

To MrSparky, thanks for the pointer to the standards. While I accept the competency requirements, ER75(e) states Hazardous Areas need inspection. Sometimes as a trade we need to get your hands dirty to ensure the REgs/Standards are followed.
   

RacyJC
Sep 30 2019 08:42

jasmoon123,

Ex nR is a restricted breathing concept and should only be used in a Zone 2 applications. In regards to inspection, this will require inspection by a competent inspector who has the relevant EEHA competencies. Too often regular inspectors sign this off with little to no knowledge on protection types
   

AngryClient
Sep 30 2019 15:54

The clause 5.3 explains the relationship between EPLs and Zones (like EPL Gas is suitable for Zone 0 installation). So perhaps look at Table 2 instead? (Make sure you use the Amd version as they changed this for dust installations).

The reason I said there was more information needed was because Ex nR is a gas protection technique and DIP should have a practise type (A or B) and zone designation after it. DIP A20 for instance would be suitable for all dust zones but DIP B22 would only be good for Zone 22 where practise B is in place.

Also re your second comment; if you are getting your hands dirty doing hazardous area installations, you are doing something wrong.

And, although the Regs require inspection, you cant expect that the inspector is going to carry the can for inept installation by someone who clearly hasn't had any formal training.
   

jasmoon123
Oct 02 2019 22:21

The full classification marking was:
Ex nR IIC T3 IP66 Ex 3095
DIP T3 IP66 Ex 3095

Which seems to make it a Zone 22 piece of equipment.

I am in a lucky position to be able to ensure the installation contractors are competent but I do expect the Electrician(s) and the Inspector to both be able to perform their job and sign off according to the Regs.

   

RacyJC
Oct 03 2019 12:34

jasmoon123,

What is your IEC or AS/NZS certification number? or is it only ATEX rated?
   

jasmoon123
Oct 04 2019 20:54

The classification marking you got is all I have. The fitting is possibly about 15years old.