Clearance Tables
- Working Space around Indoor Panel/Circuit Board (NES 312.2)
- Clearance around an Indoor electrical panel (NEC 110.26)
- Clearance for Conductor Entering in Panel (NES 408.5)
- Clearance between Bare Metal Busbar in Panel (NES 408.5)
- Clearance of Outdoor electrical panel to Fence/Wall (NES 110.31)
- Working Space around Indoor Panel/Circuit Board (NES 110.34)
- Clearance around an Outdoor electrical panel (NES 110.31)
- Elevation of Unguarded Live Parts above Working Space (NES 110.34E)
- Working Space for Panel (Code Georgia Power Company)
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/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 | 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 busbars, their supports | 200 mm |
Spacing between bottom of enclosure and non-insulated busbars | 200 mm |
Clearance between Bare Metal Busbar in Panel (NES 408.5)
Voltage | Opposite Polarity Mounted on Same Surface | Opposite Polarity Where 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 KV 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/ walls) | Exposed live parts on both sides |
601 V to 2.5 KV | 0.914 Meter (3 Ft) | 1.2 Meter (4 Ft) | 1.5 Meter (5 Ft) |
2.5 KV to 9.0 KV | 1.2 Meter (4 Ft) | 1.5 Meter (5 Ft) | 1.8 Meter (6 Ft) |
9.0 KV to 25 KV | 1.5 Meter (5 Ft) | 1.8 Meter (6 Ft) | 2.5 Meter (8 Ft) |
25 KV to 75 KV | 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. |
Non-metallic 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 KV 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/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 | 4.0 Meter | 6.0 Meter |
9 KV to 25 KV | 5.0 Meter | 6.0 Meter | 6.0 Meter |
*** NES – National environmental standards for electricity transmission activities
I am building an electrical room for my towercranes with 480 v supply. Can I have a glass window in the entry door next to the operator cabin so the operator can see into it ??
Is it safe to have a bedroom near an electrical panel? How can you protect people sleeping near one? The panel is separated from the rest of the living space by a wall. Can the wall be reinforced to provide more protection from EMF etc.?
Thank you
What is the standard for fixing height of MCCB with rotary handle, on the electrical control cabinet
I want to know about clearance between HT panel and LT panel side by side and front to front. Also want to know clearance between two LT panel.
Thanks
any one having Mr. parmar contact number
do we rquire to place rubber mat in front of 440v electrical panel
Very Useful data in a single platform for electrical engineers
Does an exterior service entrance panel need a gap/drainage plain behind it to allow water to travel freely behind it and keep it off the panel. If so how large is the gap, and can you provide me with a source. Thank You
is there any maximum distance between DG Set & control Panel.
W many distance required X-mer to panel(450v) ??
your all content is taken form electrical notes.wordpress.com.
Dear Sandeep, if you look more precisely, you will see that at the time when this article was published Mr. Jignesh Parmar was regular writer for Electrical Engineering Portal. There are tens of articles published by him – https://electrical-engineering-portal.com/author/jiguparmar
Dear Sir,
Please guide me regarding incomer selection for the LV MCC Panel.It has to be done based on the BKW rating or the actaul connected load.?
Hello JP: Thanks for all the data above. Two comments:
a. I believe NEC is been incorrectly mentioned as NES in the above article
b. Some of the values need to be reaffirmed with respect to the latest NEC 2014. For eg, from Clearance for Conductor Entering in Panel (NES 408.5), the value for Noninsulated busbars is 250mm and not 200mm. Please add a disclaimer and ask the reader to refer to the latest version of NEC
is this international standard?
because I works in environmental, health and safety field…and some issues are related with electrical…thank you.
I would like to thank you for the interesting and good articles that you share each day. It would be very helpful to give the option to download these articles
Thanks
Amgad
dear sir,
i am working with essar at last four year as a HT power distribution engineer , i have to know about thermography inspection in HT & LT SWBD