In 110.26 dedicated working space 6' above electrical equipment is required. Does that mean water piping can be located above the 6' working space ?
In 110.26 dedicated working space 6' above electrical equipment is required. Does that mean water piping can be located above the 6' working space ?
In 110.26 dedicated working space 6' above electrical equipment is required. Does that mean water piping can be located above the 6' working space ?
Your answer is correct, but your example is not. There is no requirement for "dedicated equipment space" for a transformer. You only need to maintain the dedicated equipment space for switchboards, panelboards, and motor control centers. I believe the reason (and there is no code statement that backs this up) is that we need to reserve that space for the future installation of additional conduits. Think of it this way: once the transformer (or the fused disconnect, or the variable frequency drive, or the enclosed circuit breaker) is installed and operating, are you likely to need to install additional conduits anytime in the future? I think not. But you may need to add circuits to a switchboard, a panelboard, or an MCC. That would be a more difficult task, if there was a pipe or duct in the way.
Thanks Charlie. But there is no provision to deal with the potential water hazard at all? For instance, water piping 5' directly above a transformer's footprint?
I would think if water were a hazard to a transformer it would come from below, not above, and a proper drain in the room would be a higher priority..... But there is no provision to deal with the potential water hazard at all? For instance, water piping 5' directly above a transformer's footprint?
I won't say that that is a bad idea. I will only say that the NEC does not require it.Sometimes a sheet metal drip pan would be installed above equipment. Extending at least the width of equipment if not more.
There is no provision for that at all.
Back in the 1970s the Palo Alto fire department participated in a study of using PVC pipe for residential fire sprinklers (wet system).
They worked great (at least once per installation), cost a lot less for materials and installation and could have gone a long way to making residential sprinkler systems common. But the code writers just could not accept the idea.
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