Lighting Circuit Failure

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locutus6

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At my business, it appears a lighting circuit has failed. 

What happened was all the power tripped in one section of the building.  I went to the RCD, I saw that the section was tripped and restored it.  All the power came back on.  Less than a minute later, the lights went off.  I checked the RCD and nothing is tripped.  Any suggestions?  This happened about 2 months ago, and it just fixed itself.  

I don't know why, but to turn those lights on and off, we have to use one of those emergency lighting keys (that look like a 'tuning fork'). 

 
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