Explosion Proof Wiring Systems

[Andy 7671]

I have a Diploma of Associate Engineer of three years sir.
I have done a One years vocational training too.
What ill be the requirements of fulfilling the NVQ Level 3, as I am an outsider from UK.

im working in wet wells and the like at present..(Dont ask) doing containment and cleating and have looked into further training, this is info readily available on net.

Drop them an email in the new year to see what they say, good luck.

 

[Engineer54]

hhhunzai: If you want to find an ATEX training course all you need do is punch those words into Google & a lot of relevant information comes up. If you don't mind me asking, what sort of Electrical work do you normally do ? Also don't forget that we work to British Standards whereas you appear to work to the American NEC codes of practice & they are totally different things.

Think you'll find, that if he is working in his own country Pakistan, then the standards he will be working too will be closer to the older British standards, same would go for India too. But that may not be the case as far as Hazardous areas are concerned. Our older standards in this area were closer to the American NEC codes,, but that's not the case since the harmonised Ex system has been in place!! The American ''Class 1 Division 1'' is on the whole, more stringent than the Ex systems UK now works too. So his standards in this area may be a mix of the older British standards and NEC, i wouldn't like to assume much else, and maybe totally wrong!! lol!!!

I originally thought that that the OP was an overseas worker in the Middle East, (where they do use NEC, Class 1 Division 1 codes) but was wrong, as he states he is living and working in Pakistan...

 

[Specialist]

Yes Eng I know, but i find what he's posting a bit confusing to be Honest. He's in Pakistan which by all accounts uses IEC standards but he's talking about NFPA standards which as far as i know are US standards.

 

[UKMeterman]

The OP may want to have a look at Oil, Gas & Chemicals - HSL and give them a call. If as it sound like there needs to be management training then his supervisor may also need to attend some of it.

 

[pepparz]

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.

haha its really funny reading some of these old posts by people with limited knowledge trying to look like they know what their talking about.
a little knowledge is a dangerous thing!

 

[D Skelton]

If that was a dig at Eng I can assure you, he does know what he's talking about!

 

[pepparz]

If that was a dig at Eng I can assure you, he does know what he's talking about!

does he really? the release of pressure is a by-product of the explosion.the main point of flameproof equipment is to enable a explosion to occur in a enclosure,the gap is there to quickly extinguish and cool the explosion as to not ignite the surrounding atmosphere.

 

[D Skelton]

Disclaimer here: I am no expert as although I have seen and handled the stuff, I don't install it. Explosions however I know a fair amount about.

To control damage caused by an explosion you need to control the pressure (as you quite rightly stated is a by-product of..) created, hence why even though I don't install this type of wiring, what Tony and Eng (who are probably the most qualified sparks on here regarding this topic) are talking about makes far more sense to me than what you just said.

Chobham armour for example on Challenger 2 main battle tanks is specifically designed to absorb pressure created by a shell or rocket exploding on its surface and then to control and release that pressure laterally thus minimising damage caused to the main shell. If it's purpose was to instantaneously release that pressure then put it this way, I wouldn't be writing this now.

Although I digress slightly, the point I am trying to make is if you want to minimise the effect of an explosing having taken place within a wiring system or enclosure, it makes complete sense to me that the pressure created is released in a controlled manner.

 

[pepparz]

first of all thanks for telling us youve been in a tank rambo,but i dont think youre getting the point of flameproof equipment,your not trying to minimise the effect of an explosing having taken place within a wiring system or enclosure, but to prevent it igniting any gas or dust build up on the outside of a enclosure.if you disagree with me google it or go on the compex course, but lets not spend any more time on this ive some EXd glands to make off.

 

[D Skelton]

Yes, which can only be done in a controlled way, not instantaneously as you say. A part of me thinks due to your attitude and tone that you happen to be the one without any knowledge. You seem rather defensive for someone who supposedly has nothing to prove.

I'm also not quite sure I understand the 'Rambo' quip?

Hey ho though, you know everthing so I guess that makes everyone elses knowledge irrelevant. Sorry to have questioned you Your Grace!

 

[pepparz]

ive been working on a hazardous area site for the past 13 years 10 unaided so the statments i have made are correct so please dont embarrass yourself trying to disprove them.the rambo guip is in reference to your " Challenger 2 main battle tank ive been in the TA " bit.youre not in the army so let it go.

im not an expert on anything so ill only write what i know to be true.

its been fun, have a nice weekend.

 

[High Tower]

haha its really funny reading some of these old posts by people with limited knowledge trying to look like they know what their talking about.
a little knowledge is a dangerous thing!

Can you please explain why you have dug up a 2 year old thread with the purposes of using it to have a dig at other members?

 

[Silly Sausage]

Can you please explain why you have dug up a 2 year old thread with the purposes of using it to have a dig at other members?

He's an odd one this pepparz!

 

[D Skelton]

ive been working on a hazardous area site for the past 13 years 10 unaided so the statments i have made are correct so please dont embarrass yourself trying to disprove them.the rambo guip is in reference to your " Challenger 2 main battle tank ive been in the TA " bit.youre not in the army so let it go.

im not an expert on anything so ill only write what i know to be true.

its been fun, have a nice weekend.

I'm not embarrasing myself at all, I don't know you from adam yet you're on here digging at people so I'm perfectly within my rights to query your skills, as for whether or not I believe what you say that's an entirely different matter. Do remember however that people used to believe the world was square, turned out they were wrong. I think I'll stick to listening to what Tony and Eng have to say on the matter as I tend to have more time for what they say and plus, I know they know what they are talking about.

P.S. I've never been in the TA so don't quite know what you're talking about there???

 

[SPARTYKUS]

Gone quiet now a moderator's asked a direct question...!