Exposed Live Parts

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TheElevatorGuy

TheElevatorGuy

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New York, New York
If a motor controller has doors on the front of it and all the live parts are mounted in the front is the front of this controller considered exposed live parts based on the code? Thanks in advance.
 
Working clearances. All of the new elevator controller equipment is in a cabinet with all the live parts mounted on the front. I can close the doors supplied with this cabinet and nothing "live" is exposed. Would this be considered by the code to be "exposed live parts" even if the doors are closed? When we trouble shoot obviously the doors would be open. I feel like it is a foolish question but reading 110.26(A)(1)(a) has been difficult for me to interpret. Thank you for the help.
 
With the doors open for testing, that equipment would have exposed live parts. All of the conditions in the table are based on exposed live parts on one side of the working space. Those exposed live parts would be the equipment you are working on. The depth of the working space required depends on what is across from the exposed live parts (behind you when you are standing in front of the cabinet working on it) and the voltage to ground.

When the doors are closed, there are no exposed live parts. The requirements of 110.26(A) would not apply with the doors closed because that section is for working on energized equipment. You couldn't be working on the energized cabinet if the doors are closed. When you open the doors to do the work, you need the working space required in Table 110.26(A)(1).
 
Working space is measured from the closed door of the enclosure with the live parts inside.
 
TheElevatorGuy said:
Working clearances. All of the new elevator controller equipment is in a cabinet with all the live parts mounted on the front. I can close the doors supplied with this cabinet and nothing "live" is exposed. Would this be considered by the code to be "exposed live parts" even if the doors are closed? When we trouble shoot obviously the doors would be open. I feel like it is a foolish question but reading 110.26(A)(1)(a) has been difficult for me to interpret. Thank you for the help.
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For the purposes of applying Table 110.26(A)(1) they are. Take a look at the text in 110.26(A)(1).
(1) Depth of Working Space.
The depth of the working space in the direction of live parts shall not be less than that specified in Table 110.26(A)(1) unless the requirements of 110.26(A)(1)(a), (A)(1)(b), or (A)(1)(c) are met. Distances shall be measured from the exposed live parts or from the enclosure or opening if the live parts are enclosed.
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d0nut said:
With the doors open for testing, that equipment would have exposed live parts. All of the conditions in the table are based on exposed live parts on one side of the working space. Those exposed live parts would be the equipment you are working on. The depth of the working space required depends on what is across from the exposed live parts (behind you when you are standing in front of the cabinet working on it) and the voltage to ground.

When the doors are closed, there are no exposed live parts. The requirements of 110.26(A) would not apply with the doors closed because that section is for working on energized equipment. You couldn't be working on the energized cabinet if the doors are closed. When you open the doors to do the work, you need the working space required in Table 110.26(A)(1).
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The requirements of 110.26(A) apply to the installation of the equipment because in the life of that equipment, it will be examined while energized. The physical installation of the equipment must be made in a manner that will provide the required workspace when it is worked on while live.
 
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