Working Space around Indoor Panel/Circuit Board (NES 312.2):
Voltage
| Exposed live parts to Not live parts( or grounded parts ) | Exposed live parts to Grounded parts (concrete, brick, and walls). | Exposed live parts on both sides |
Up to 150 V
|
0.914 Meter (3 Ft)
|
0.914 Meter (3 Ft)
|
0.914 Meter (3 Ft)
|
150 V to 600 V
|
0.914 Meter (3 Ft)
|
1.07 Meter (3’6”)
|
1.22 Meter (4 Ft)
|
Clearance around an Indoor electrical panel (NES 110.26):
Description of Clearance
|
Distance (min)
|
| Left to Right the minimum clearance |
0.9 Meter (3 Ft)
|
| Distance between Panel and wall |
1.0 Meter
|
| Distance between Panel and Ceiling |
0.9 Meter
|
| Clear Height in front of Panel>480V |
2.0 Meter
|
| Clear Height in front of Panel <480v span="span"> |
0.9 Meter (3 Ft)
|
| Clearance When Facing Other Electrical Panels < 480V |
0.9 Meter (3 Ft)
|
| The width of the workingspace in front of the Panel |
The width of Panel or 0.762 Meter which is Greater.
|
| Headroom of working spaces for panel boards (Up to 200Amp) |
Up to 2 Meter
|
| Headroom of working spaces for panel boards (More than 200Amp &Panel height is max 2 Meter) |
Up to 2 Meter( If Panel height is max 2 Meter)
|
| Headroom of working spaces for panel boards (More than 200Amp &Panel height is more than 2 Meter) |
If Panel height is more than 2 Meter than clearance should not less than panel Height
|
| Entrance For Panel (More than 1200 Amp and over 1.8 m Wide) |
One entrance required for working space (Not less than 610 mm wide and 2.0 m high )
|
| Personal Door For Panel (More than 1200 Amp) |
Personnel door(s) intended for entrance to and egress from the working space less than 7.6 m from the nearest edge of the working space
|
| Dedicated Electrical Space. |
Required Space is width and depth of the Panel and extending from the floor to a height of 1.8 m (6 ft) above the equipment or to the structural ceiling, whichever is lower
|
| The door(s) shall open in the direction of egress and be equipped with panic bars, pressure plates, or other devices that are normally latched but open under simple pressure | |
| the work space shall permit at least a 90 degree opening of equipment doors or hinged panels |
Clearance for Conductor Entering in Panel (NES 408.5):
Description of Clearance
| Distance (min) |
Spacing between The conduit
or raceways(including their end fittings) and Bottom of Enclosure
|
Not rise more than 75 mm (3 in) above the bottom of the enclosure
|
Spacing Between Bottom
of Enclosure and Insulated bus bars, their supports,
|
200 mm
|
Spacing Between Bottom of Enclosure and Non insulated bus bars
|
200 mm
|
Clearance between Bare Metal Bus bar in Panel (NES 408.5):
Voltage
| Opposite PolarityMounted on Same
Surface
| Opposite PolarityWhere Held Free in Air | Live Parts to Ground |
| Up to 125 V | 19.1 mm | 12.7 mm | 12.7 mm |
| 125 V to 250 V | 31.8 mm | 19.1 mm | 12.7 mm |
| 250 V to 600 V | 50.8 mm | 25.4 mm | 25.4 mm |
Clearance of Outdoor electrical panel to Fence/Wall (NES 110.31):
Voltage
| Distance (min) |
| 600 V to 13.8 KV |
3.05 Meter
|
| 13.8 K V to 230 KV |
4.57 Meter
|
| Above 230 KV |
5.49 Meter
|
Working Space around Indoor Panel/Circuit Board (NES 110.34):
Voltage
| Exposed live parts to Not live parts( or grounded parts ) | Exposed live parts to Grounded parts (concrete, brick, and walls). | Exposed live parts on both sides |
601 V to 2.5 K V
|
0.914 Meter (3 Ft)
|
1.2 Meter (4 Ft)
|
1.5 Meter (5 Ft)
|
2.5 K V to 9.0 K V
|
1.2 Meter (4 Ft)
|
1.5 Meter (5 Ft)
|
1.8 Meter (6 Ft)
|
| 9.0 K V to 25 K V |
1.5 Meter (5 Ft)
|
1.8 Meter (6 Ft)
|
2.5 Meter (8 Ft)
|
| 25 K V to 75 K V |
1.8 Meter (6 Ft)
|
2.5 Meter (8 Ft)
|
3.0 Meter (10 Ft)
|
Above 75 KV
|
2.5 Meter (8 Ft)
|
3.0 Meter (10 Ft)
|
3.7 Meter (12 Ft)
|
Clearance around an Outdoor electrical panel (NES 110.31):
Description of Clearance
| Distance (min) |
| Clear work space: | Not less than 2.0 Meter high(Measured vertically from the floor or platform) or not less than 914 mm (3 ft) wide (Measured parallel to the equipment). |
| Entrance For Panel (More than 1200 Amp and over 1.8 m Wide) | One entrance required for working space (Not less than 610 mm wide and 2.0 m high ) |
| Entrance For Panel: On Large panels exceeding 1.8 Meter in width | One Entrance at each end of the equipment. |
| Nonmetallic or Metal-enclosed Panel in general public and the bottom of the enclosure is less than 2.5 m (8 ft) above the floor or grade level | Enclosure door or hinged cover shall be kept locked. |
Elevation of Unguarded Live Parts above Working Space (NES 110.34E):
Voltage
| Elevation (min) |
| 600 V to 7.5 KV |
2.8 Meter
|
| 7.5 K V to 35 KV |
2.9 Meter
|
| Above 35 KV |
2.9 Meter + 9.5 mm/KV
|
Working Space for Panel (Code Georgia Power Company):
Voltage
| Exposed live parts to Not live parts( or grounded parts ) | Exposed live parts to Grounded parts (concrete, brick, and walls). | Exposed live parts on both sides |
Up to 150 V
|
3.0 Meter
| 3.0 Meter | 3.0 Meter |
150 V to 600 V
| 3.0 Meter | 3.5 Meter | 4.0 Meter |
600 V to 2.5 KV
| 3.0 Meter | 4.0 Meter | 5.0 Meter |
2.5 KV to 9 KV
| 3.0 Meter | 5.0 Meter | 6.0 Meter |
9 KV to 25 KV
| 5.0 Meter | 6.0 Meter | 6.0 Meter |
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