MCB and Fused terminals in EEXe enclosure

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from the Forum department...

MCB and Fused terminals in EEXe enclosure

Posted by VK Aggarwal on 30 June, 2009 - 5:32 am

I have an EExe certified enclosure (a junction box). Can I stick two MCB's and few fused terminals in it without sacrificing the certification. In case a fuse blows, it happens within its sealed glass tube. In case an MCB drops on account of overload, the switching will take place within the MCB housing.

Regards
VK Aggarwal

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Posted by Bruce Durdle on 3 July, 2009 - 6:58 pm

No - one of the conditions of use for an Exe box is that it cannot contain any potentially sparking components (unless these are protected using another method - you can have for instance an Exd protected switch in an Exe enclosure).

A fuse may have an external temperature that is elevated even at rated current.

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