Type of MCB to be used inside the EX e street Lighting Junction box
Type of MCB to be used inside the EX e street Lighting Junction box
(OP)
Good day to you
We propose to introduce a MCB inside the Street Lighting Junction box ( EX e Certified) installed in Hazardous area.
Contractor propose to use a normal MCB with C curve.
The query is whether MCB should also be Ex cerified. Ex panel manufacturers like Stahl are providing Ex rated MCBs inside the control Junction Box.
Request your clarification.
Regards
Ramesh






RE: Type of MCB to be used inside the EX e street Lighting Junction box
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If we learn from our mistakes I'm getting a great education!
RE: Type of MCB to be used inside the EX e street Lighting Junction box
It is very strange to hear that there are MCBs which are Ex e certified? In fact STAHL makes Ex e and Ex d enclosures with normal MCBs (Trip curve depends on the user) inside. But the MCBs are not Ex e or Ex d certified. How can you certify a MCB as Ex e or Ex d?
Since it is a classified area you can install a distribution panel with MCBs housed in a Ex e or Ex d certified enclosure.
RE: Type of MCB to be used inside the EX e street Lighting Junction box
Good day to you
Please refer the attached files, which specifies that any spark producing component shall be Ex certified.
Regards
Ramesh
RE: Type of MCB to be used inside the EX e street Lighting Junction box
Those MCBs are a special design and are expensive. They have little in common with the standard European MCB. I have not seen a Stahl Ex 'e' enclosure with standard MCBs - can you post a reference to that product line?
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If we learn from our mistakes I'm getting a great education!
RE: Type of MCB to be used inside the EX e street Lighting Junction box
The attached file is on Ex rated MCB of COOPER for your reference
Regards
Ramesh
RE: Type of MCB to be used inside the EX e street Lighting Junction box
If someone wants to use these MCB inside a protected enclosure then also these is no problem. But even if a normal MCB is used inside it, this can also fulfill the purpose.
RE: Type of MCB to be used inside the EX e street Lighting Junction box
Increased safety "e"
Type of protection applied to electrical apparatus in which additional measures are applied so as to give increased security against the possibility of excessive temperatures and of the occurrence of arcs and sparks in normal service or under specified abnormal conditions
NOTE 1 This type of protection is denoted by "e". The "additional measures" are those required for compliance
with this standard.
NOTE 2 Apparatus producing arcs or sparks in normal service is excluded by this definition of increased safety.
You can not use a standard MCB in an Ex'e' application.
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If we learn from our mistakes I'm getting a great education!
RE: Type of MCB to be used inside the EX e street Lighting Junction box
Please see the attachment.Unfortunately I donot have inside picture.I referred to these Ex d or Ex e enclosures where normal mcbs (IEC60898) or contactors are wired.The cable entry can be direct entry to an Ex d enclosure with Ex d glands or indirect entry terminating to an Ex e terminal block inside Ex e enclosure.If such indirect entry is used then there is a seal between Ex e and Ex d chambers.
RE: Type of MCB to be used inside the EX e street Lighting Junction box
oops,lost the attachment.
Please see the attachment.Unfortunately I donot have inside picture.I referred to these Ex d or Ex e enclosures where normal mcbs (IEC60898) or contactors are wired.The cable entry can be direct entry to an Ex d enclosure with Ex d glands or indirect entry terminating to an Ex e terminal block inside Ex e enclosure.If such indirect entry is used then there is a seal between Ex e and Ex d chambers.
RE: Type of MCB to be used inside the EX e street Lighting Junction box
Good day to you
My query is using only EX e box for installing MCB, switching device which can create spark.
Your attachment of Ex d e box has a separate Ex d compartment where any normal switching devices can be installed. it ha sno issues as inside Ex d box there is no restriction. I Contacted STAHL and they have confirmed that any devices inside Ex e type box shall have individual certification.( refer attached file)
Regards
Ramesh