NEC Working Space
Condition 2 over 75000V, min ____ ft.
10
Condition 3 over 25000V, min ____ ft.
10
Condition 3 over 75000V, min ____ ft.
112
Large switchboards and control panels rated ____ amperes or more require at least ___ inches wide and ___ feet high at both ends providing an exit route.
1200, 24, 6 ½
Exc...Existing service up to ____ amp ok < 6 ½ feet.
200
A clearance of ___ feet from a non-fireproof ceiling is required unless the switchboard is totally enclosed or a fireproof barrier is provided.
3
Condition 1 over 600V, min ____ ft.
3
Condition 1 up to 150V, min ____ ft.
3
Condition 1, up to 600V, min _____ ft.
3
Condition 2 up to 150V, min ____ ft.
3
Condition 3 up to 150V, min ____ ft.
3
Working clearance from live parts up to 150 volts min ___ feet.
3
Condition 2 up to 600V, min ____ ft.
3 ½
Clear width min ____ inches wide or width of equipment.
30
Front working space min ___ deep.
36 inches
Condition 1 over 2500V, min ____ ft.
4
Condition 2 over 600V, min ____ ft.
4
Condition 3 up to 600V, min ____ ft.
4
Condition 1 over 9000V, min ____ ft.
5
Condition 2 over 2500V, min ____ ft.
5
Condition 3 over 600V, min ____ ft.
5
Any live parts over ___ volts must be guarded.
50
Condition 1 over 25000V, min ____ ft.
6
Condition 2 over 9000V, min ____ ft.
6
Condition 3 over 2500V, min ____ ft.
6
Exc... Related equipment may extend ___ inches beyond panel front.
6
Min headroom ____ or equipment height.
6 ½ feet
Access or contact must be restricted by locked rooms or enclosures or by elevation of the equipment for equipment operating over ____ volts.
600
Condition 1 over 75000V, min ____ ft.
8
Condition 2 over 25000V, min ____ ft.
8
Condition 3 over 9000V, min ____ ft.
9
Hinged doors must be openable at least _____ degrees.
90
The phase arrangement for 3-phase bus bars must be __, __, & __, from _____ to ___, ___ to ____, and ____ to ____.
ABC, front to back, top to bottom, left to right
Work space extends to _____.
Floor
________ required for all indoor panels.
Illumination
Condition 1 - Exposed live parts on ___ side of the working space and ___ live or grounded parts on the other side of the working space, or exposed live parts on both sides of the working space that are effectively guarded by insulating materials.
One, no
_____ are placed in cabinets or in cutout boxes that are accessible from the front and contain fuses or circuit breakers.
Panelboards
Working space not to be used as ______.
Storage
____ are typically free-standing and are accessed from both the front and back.
Switchboards
Working space requirements for _____,_____,_____, and _____.
Switchboards, panelboards, transformers, capacitors
Condition 3 - Exposed live parts on ___ sides of the working space.
both
Panel need not be ______ in space.
centered
Any switchboard that has exposed live parts must be in a permanently ___ location and accessible to only ___ personnel.
dry, qualified
Distance measured from ____ of enclosure or _____ parts.
face, live
High leg to ground must be _____.
marked
Condition 2 - Exposed live parts on ___ side of the working space and ____ parts on the other side of the working space. Concrete, brick, or tile walls shall be considered as grounded.
no, grounded
