Equipment spacing

[Pok3r]

there is about 4" to the roof of this MCC.. is there a violation?


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[GoldDigger]

Does the MCC have required ventilation space for convective cooling of its innards?

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[Pok3r]

Is there a reference section i can look at in the NEC that states distance of clearance to roofs tops


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[ActionDave]

Is there a reference section i can look at in the NEC that states distance of clearance to roofs tops


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110.26

 

[REDICO]

If it doesn't involve the electrical panel nothing foreign to the sustwm can be above the gear for 6' except the roof, not a drop ceiling. 110.26

 

[jumper]

If it doesn't involve the electrical panel nothing foreign to the sustwm can be above the gear for 6' except the roof, not a drop ceiling. 110.26

If you are saying that the drop ceiling is a violation, I disagree. 110.26(E)(1) has an exception.

Exception: Suspended ceilings with removable panels shall
be permitted within the 1.8-m (6-ft) zone

 

[Carultch]

If it doesn't involve the electrical panel nothing foreign to the sustwm can be above the gear for 6' except the roof, not a drop ceiling. 110.26

The intent of the section about foreign equipment, is primarily plumbing and HVAC equipment, like piping and ductwork. Not structures and the drop ceiling itself.

 

[JRE]

The manufacturer may have required distances for cooling.

 

[petersonra]

(3) Height of Working Space. The work space shall be
clear and extend from the grade, floor, or platform to a height
of 2.0 m (61⁄2 ft) or the height of the equipment, whichever is
greater.

I don't see a violation if the ceiling is 6.5 ft or higher off the floor.

 

[petersonra]

The manufacturer may have required distances for cooling.

I don't recall ever seeing vents in the roofs of MCCs.