Compex Flashcards
Ex d
Flameproof, 1/2
Ex e
Increased safety, 1,2
Ex n
Non incendive, 2
Ex i
Intrinsic safety, 0,1,2
Ex p
Pressurisation, 1,2
What zones does 0,1 & 2 equate to
1G
What zones does 1 & 2 equate to
2g
What zones does 2 equate to
3G
What is the difference between international standards and British standards?
Nothing, they are the same
What does x mean after certificate number?
Special conditions of use
What gas group is Ethelyne in?
IIB the middle dangerous one
What gas group is propane in?
IIA the least dangerous one
What gas group does hydrogen and acetylene belong to
IIC the most dangerous one
When did atex 153 become fully compliant?
0/07/2006. They were made in 2003 but got 3 years to get sorted for them
What does atex 153 have to do with
The health and safety side of explosive atmospheres. Training, stuff like that
What aspect does atex 114 have to do with
That is product directive, brought in to try and improve the trade between the EU so that everything was to the same standard
Why could the EPL be changed after the risk assessment
due to the potential consequences of a hazard. If in a built up city then the consequences are higher then I if it’s in middle of nowhere
What is symbol for ambient temperature?
TA will be on the equipment. This will mean that it is safe to use in temperature -20 to + 40 degrees
What equipment can go in a IIA gas area
IIA only
If the equipment certification number ends with a U what does this mean?
It means it is an ex component, like a stopper or a gland and cannot provide protection by itself but is an additional thing
What does it mean if the equipment certification has a x at the end
It means it has special conditions of use. Eg terminal blocks, earthing requirements, voltage, gaskets
What is IEC 60079-10 about?
Area classification
What is IEC 60079-14 about?
Installation
What is IEC 60079-17 about?
Inspection
What is IEC 60079-0 about?
Equipment general requirements
What is needed to do an area classification?
What zone it is, II(A,B or C) depending on the gas, what temperature will be in the area
When would you use a barrier gland?
If it has a potential ignition and is in a IIC gas area
What can T level equipment can go in a T3 area?
T3, T4, T5, T6
What level of equipment can go in a T6 area
Only T6 equipment
What equipment can go in a T1 area
T1T2T3T4T5T6
What can go in a T5 area
T5 & T6
Where can ex n equipment only be used?
Zone 2
What is the most dangerous zone?
Zone 0
What is the least dangerous zone?
Zone 2
What are the 3 letters associated with ex p (pressurisation)
Px, py, pz
What does the protective gas have to be?
It has to be from a non hazardous area
What p is required if ignition and in zone 1
Px
What p is required if no ignition and in zone 1
Py
What p is required if ignition and in zone 2
Pz
What happens in a pressurised system if it alarms
You need to restore integrity or if it cannot be restored then turn the equipment off
On a pz c high voltage what would you do on a close inspection?
Check the ducts, pipes, and fans on the side of the motor.
How would you signify a flameproof gland (hawke 453)
It has a black bit on it and on the gland it should say
Where would you use a black hawke 453 gland?
For a JB or soemthing like that
Where would you use a red barrier gland
If it’s has an ignition in it like a switch or a contactor
What zone can ic go in?
Can only go in zone 2 & equipment category 3
What zone can ib go in?
Can only be used in zones 1 & 2 and equipment category is 2
What zones can ia be used in?
Can be used in zones 0,1,2 and equipment category is 1
What is nA?
Non sparking
What is nC
Sparking, devices are sealed devices
What is nL
Energy limitation equipment also known as Ic
What is nR
Restricted breathing, installation instructions observed
