Step height for emergency exit electircal vault

[brother]

I checked the NEC, but of course it would not be in there. It was my understanding that most steps had a general height of 7 inches to exit an electrical roo .

My question is, what is the maxium height allowed for a an emergency egress step (basically there is only one) to exit an electrical vault, basically over 600 volts?

The step I see is 14 inches in height, I believe they forgot or needed to install another step to meet the 7 inch requirement for the exit.

I would hate to be in a hurry to get out of that vault. By the way, this is NEW contstruction, but it has occupancy already. What is the correct code about a step in an electrical vault? NEC 110 deals with clearance about some things, but Im not sure what building code would cover this.

 

[Gregg Harris]

I checked the NEC, but of course it would not be in there. It was my understanding that most steps had a general height of 7 inches to exit an electrical roo .

My question is, what is the maxium height allowed for a an emergency egress step (basically there is only one) to exit an electrical vault, basically over 600 volts?

The step I see is 14 inches in height, I believe they forgot or needed to install another step to meet the 7 inch requirement for the exit.

I would hate to be in a hurry to get out of that vault. By the way, this is NEW contstruction, but it has occupancy already. What is the correct code about a step in an electrical vault? NEC 110 deals with clearance about some things, but Im not sure what building code would cover this.

Take a look at IBC Means of Egress 1003.5

7 inches

 

[cadpoint]

Ok Besides the Codes...


It really comes back to ergonomics, there are studies of Rise and Pitch ratio's where the step of a foot a human foot has been well studied! The Mean of these averages happen to be (around) 7" of rise to 11" of run in respect to stairs.