Spaces about electrical Equipment

[Carlos Jimenez]

In a room of 13.2 kV are 6 cells (switchboard). These are found in the front at 3 meters of the wall and the rear at 1 meter from the wall. According to the NEC, it should be provide a working space of 1.5 m (13.2kV) as long as work is carried out with energized equipment. The question is:

It is necessary to these distances in the front and back of the cells (switchboard 13.2 kV)?. When a person access the rear of the cell is to work on the output wires, this work is always done with the switch open and the cell extracted, and the other side of the circuit is opened (opened air switch). Now when there is some work on the front switch is removed and the bars are in a separate compartment, a person can not access them. The only access at the front is the control of the cell, where voltages are less than 150V, in this the long of the workspace would be 900 mm.

It is necessry to let a space in the rear of 1.5 meter?

 

[muzafferz]

spaces about electric equipment

spaces about electric equipment

one can never guranatee that people will work or inspect staff only when it is de-energized.
you need to have working clearance as required on all accessible sides.
in one of my jobs inspector tagged a situation. switchgear was front access only by shop drawings but it was 4-ft deep, he said who has 4ft arms or remove some components to reach back and required rear access with full clearance.