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ARC FLASH IN LOW VOLTAGE MAIN BOARD

Former Community Member
Former Community Member
Hi eveyone ! 


I was wondering if there is a conservative table out there that tells which PPE you should use depending on the voltage, normal current, and shortcircuit perhaps of the place you are working.. 


Specially this is because of a new installation, which will have a main circuit breaker of 2000A, in 400V with a three phase shortcircuit fault of aprox 30KA at the point of the main CB.


When we energise for the first time, what type of PPE should we use ? I have been reading and depends on the cal/m2 but perhaps there was a rapid conservative table or experience of yours to tell what type of PPE we should use 


Also, the main circuit breaker is inside the gabinet, and has no dead front to cover the cooper busbars, they are covered in the front with transparent acrylic (6mm depth), in order to prevent to touch them. So to turn on the MCB we have to do it with the gabinet open
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    Alasdair Anderson:

    I am definitely with Alan on this one. Don't forget that the approved PPE doesn't prevent burns/injury, but rather just ensures you have an injured person rather than a dead one.....


    This reminds me of one of the lessons learned in the Falklands war. At that time, personnel would put their designation, e.g. "CO" in black felt pen on the flash hood. Problem was, when there really was a flash, the black section absorbed sufficient heat to brand the foreheads of those affected.


    Nowadays, the designation is written on the flap of a breast pocket, which overlies the pocket itself, so that there are 4 layers instead of 2.


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    Alasdair Anderson:

    I am definitely with Alan on this one. Don't forget that the approved PPE doesn't prevent burns/injury, but rather just ensures you have an injured person rather than a dead one.....


    This reminds me of one of the lessons learned in the Falklands war. At that time, personnel would put their designation, e.g. "CO" in black felt pen on the flash hood. Problem was, when there really was a flash, the black section absorbed sufficient heat to brand the foreheads of those affected.


    Nowadays, the designation is written on the flap of a breast pocket, which overlies the pocket itself, so that there are 4 layers instead of 2.


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