A lot. 
 
But your mechanical room door isn't opened regularly either so  with a sump in there humidity will build up fast.  
Over time it could seize your breakers.  
 Call an electrical company and ask if there is any potential danger putting a large open top body of water with water movement and evaporation in close proximity to your panel. 
 
But your panel isn't in that room so it doesn't really apply to you. 
		
	
		
		
		
		
			
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				Last edited by e46er; 12-20-2014 at 06:26 PM.
				
				
			
		
		
	
		
		
	
	
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