Safety Clearance for Electrical Panel

Safety Clearance for Electrical Panel:

 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

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

About Jignesh.Parmar
Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical) from Gujarat University. He has more than 13 years experience in Power Transmission-Power Distribution-Electrical energy theft detection-Electrical Maintenance-Electrical Projects(Planning-Designing-coordination-Execution). He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. He is Freelancer Programmer of Advance Excel and design useful Excel Sheets of Electrical Engineering as per IS,NEC,IEC,IEEE codes. He is technical Author for "Electrical Mirror" and "Electrical India" Magazines. He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages. He wants to Share his experience & knowledge and help technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics.

9 Responses to Safety Clearance for Electrical Panel

  1. Emmanuel Osafo Gyane says:

    Thank You!!!

    ________________________________

    • saraswata palit says:

      in indian context we need that clearence as per IE rule or IS or IEC. Please reallign the document as per these codes/practises. Wecan not refer NES or equiv

  2. Dilip says:

    NES is abbreviated as ?

  3. Kiran Kumar --- SYSTEM DESIGN ENGINEER says:

    Dear Sir,
    Is there any Indian standard which gives clearances for panels…! Does Indian Electricity Rules give any info regarding as it would be easy to convince the clients for approval……!

  4. Kumar Ishu Srivastava says:

    hai sir,

    I juzz want to ask u had how does a LT circuit breaker trips on single phasing

  5. saipriyan says:

    thank for your valuable information

  6. ntin says:

    Dear sir,
    what will be the minimum clearance between back wall and panel if panel is not back opening.
    can u tell me the standard(IS/IEC) Were i got all these clearance.

  7. naban5 says:

    what should be the clearance(verical,horizonotal) between two adjacent MCCBs.If two MCCBs touch each other what is the derartng factor to apply.

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