Clearances for panels

[jonny1982]

What kind of clearances do I need for a 1200 amp, 277/480 Main distribution panel? Just 3 feet in front?

And for a 125 amp, 120/208 panel?

Thanks

 

[charlie b]

The ampere ratings do not matter. What matters is only the voltage to ground. For the 480/277V system, the required minimum depth of the working space is 42 inches. For the 120/208V system, the required depth of the working space is 36 inches. Reference 110.26.

 

[Smart $]

... and the greater of panel width or 30".

And if this is related to the transformer of your other post, the transformer cannot be within those footprints.

 

[jonny1982]

The ampere ratings do not matter. What matters is only the voltage to ground. For the 480/277V system, the required minimum depth of the working space is 42 inches. For the 120/208V system, the required depth of the working space is 36 inches. Reference 110.26.

Thank-you

 

[jonny1982]

... and the greater of panel width or 30".

And if this is related to the transformer of your other post, the transformer cannot be within those footprints.

Thank-you. When you say within those foot prints, do you mean from floor to ceiling?

 

[arcsnsparks98]

From floor to 6' above the panel. Or the structural ceiling. Whichever comes first.

 

[don_resqcapt19]

From floor to 6' above the panel. Or the structural ceiling. Whichever comes first.

The 110.26(A) working space only extends to 6'6" or the height of the equipment, which ever is greater. The 110.25(F) space extends above the panel, but unlike the workspace the equipment space is only directly over, not in front or to the sides of the equipment.

The work space is intended to provide a safe work area for some one working on the equipment. The equipment space is intended to provide room to connect conduits and or cables to the top of the equipment.

 

[jonny1982]

The 110.26(A) working space only extends to 6'6" or the height of the equipment, which ever is greater. The 110.25(F) space extends above the panel, but unlike the workspace the equipment space is only directly over, not in front or to the sides of the equipment.

The work space is intended to provide a safe work area for some one working on the equipment. The equipment space is intended to provide room to connect conduits and or cables to the top of the equipment.

Thank-you

 

[infinity]

One other thought, the 42" dimension is from a grounded surface, if you had two switchboards of 480/277 volts facing each other you would need 48".