Explosion Proof Wiring Systems

[needasparks]

Can hear the click of the yanks safety catches being taken off as we speak.

 

[hhhunzai]

Thank you all for giving comments, as I said I am not a new installer of electrical systems. But In explosion proof systems, I am a little new, I am learning right now but not installing. I preparing myself for such a situation.
Therefore I am requesting you about the cable.
Where I am considering the location is an open area with a shed.
I am just wondering of cable that it should be heat proof or heat retardant.
This is the question?
If I am going to install conduits then me should Install heat retardant or heat proof cable.?
I know, If I someone will use open cable he obviously will use an MI cable.

 

[clicon357]

I worked in an animal feed mill about 20 years ago. EVERYTHING was covered in a fine flour like dust. On the roof where few people went the plant was covered in a crust - it would rain and more dust would stick to the crust underneath. Don't suppose they would get away with it now. All the wiring was in conduit and it was apparently "pressurised" from an air feed system to stop dust building up and igniting etc.

 

[Knobhead]

Conduits between panels have to be designed with flame paths in mind. There’s no point having “Ex” equipment if a passage exists between them to propagate a path.

Please go and study the subject, it’s not one for an open forum!

 

[Specialist]

Thank you all for giving comments, as I said I am not a new installer of electrical systems. But In explosion proof systems, I am a little new, I am learning right now but not installing. I preparing myself for such a situation.
Therefore I am requesting you about the cable.
Where I am considering the location is an open area with a shed.
I am just wondering of cable that it should be heat proof or heat retardant.
This is the question?
If I am going to install conduits then me should Install heat retardant or heat proof cable.?
I know, If I someone will use open cable he obviously will use an MI cable.

Explosion proof systems are a Very specialised area of the Electrical Industry. It is'nt something you can learn by just picking up & reading a book or asking questions on a Forum. You make a mistake & you could end up with an Explosion & Peoples Deaths on your conscience.

 

[netblindpaul]

For a change after recent times, Tony & I are in FULL and TOTAL agreement! :yesnod:

 

[Andy 7671]

Please do not think about installing this, not matter how much pressure or financial strain you are under..WALK AWAY.

Once you can prove you are a fully qualified and competent electrician contact ATEX COMPEX or DSEAR training providers and they will give you guidance.




You obviously have initiative, I wish you well in your studies...

 

[bomjac]

I worked in an animal feed mill about 20 years ago. EVERYTHING was covered in a fine flour like dust. On the roof where few people went the plant was covered in a crust - it would rain and more dust would stick to the crust underneath. Don't suppose they would get away with it now. All the wiring was in conduit and it was apparently "pressurised" from an air feed system to stop dust building up and igniting etc.

Just to back this up - we had a brand new gas turbine, from one of the biggest electrical manufacturers in the world (clue - GE), allegedly full " ATEX compliant" - By the time that some experienced, qualified and competent ATEX qualified personnell had finished inspecting it to current standards, it took about 1 month to put right !

And to back Tony up, 2 of the biggest issues we had were gas and fuel valves, connected to non certified conduit with no sealing mechanism fitted.

 

[Engineer54]

Conduits between panels have to be designed with flame paths in mind. There’s no point having “Ex” equipment if a passage exists between them to propagate a path.

Please go and study the subject, it’s not one for an open forum!

Agree with Tony, This is the whole point of sealed conduit systems in hazardous areas. As for the wiring system, in the NEC normally calls for 105C to 125C insulation types.

Even the the panels and boxes related to class 1 division 1 are designed to give a controlled release of pressure within the containment installation. Which is why they are so dammed heavy, with large area flat sealing faces, they have to be able to contain initial internal explosions, while the sealing flat faces, expand enough to allow the escape of pressure.

One of the most important aspects of these conduit systems is the placement of sealing fittings and knowing Where to fit them. That significantly reduces the risk of flame paths from one area to another. It's similar to compartmentalising the conduit system into sections, thus confining/restricting any faults in the system to the area they originate in.

 

[hhhunzai]

Thank you very much for your good advices and I will obey as you said.
You are very true that, this is a matter of life so we should be aware be of it and keep it in mind.
Thank you all again for your inputs in my thread.

 

[Specialist]

Thank you very much for your good advices and I will obey as you said.
You are very true that, this is a matter of life so we should be aware be of it and keep it in mind.
Thank you all again for your inputs in my thread.

hhhunzai: Glad to see you've hopefully realised that this sort of system is best Left to fully trained / skilled engineers. Look at it this way: If you were to carry on & install this equipment without the relevant training / skills and were to get it wrong causing an Explosion, it would be you in Prison (And Rightfully so) not the person who told you to do it. They would be sitting back & denying ever telling you to do so.

 

[Engineer54]

Thank you very much for your good advices and I will obey as you said.
You are very true that, this is a matter of life so we should be aware be of it and keep it in mind.
Thank you all again for your inputs in my thread.

hhhunzai: Glad to see you've hopefully realised that this sort of system is best Left to fully trained / skilled engineers. Look at it this way: If you were to carry on & install this equipment without the relevant training / skills and were to get it wrong causing an Explosion, it would be you in Prison (And Rightfully so) not the person who told you to do it. They would be sitting back & denying ever telling you to do so.

Unfortunately, it won't be us he obeys, it will be whoever is employing him!! He is not in any position to argue with his employers, he will be ''Gone'' and another electrician from among thousands, will be readily recruited to take his place. Who Will obey this employer...

 

[trev]

hhhunzai: Look at it this way: If you were to carry on & install this equipment without the relevant training / skills and were to get it wrong causing an Explosion, it would be you in Prison (And Rightfully so) not the person who told you to do it. They would be sitting back & denying ever telling you to do so.

I think the Pakistani legal system takes a dimmer view than ours of causing deaths so it might be worse than a prison sentence he would need to be worried about

 

[SPARTYKUS]

Another world out there,

My dad used to live in Bahrain in the 90's.

There .... was no crime. Because, if you commited rape, you were castrated, if you stole, your hand was removed.

A theif made the front page of the rag there when we went for a trip because someone stealing something was BIG news !

Not sure if I agree or not but I like the lack of crime thing.

 

[Engineer54]

I think the Pakistani legal system takes a dimmer view than ours of causing deaths so it might be worse than a prison sentence he would need to be worried about

I think you'll find that the OP isn't actually doing this work in Pakistan, more likely he is an immigrant worker in the Middle East or somewhere similar.....