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What are the clearances required for installation of a QED Switchboard?

Issue:
What are the clearances required for installation of a QED Switchboard?

Product Line:
QED Switchboards

Environment:
Installation

Cause:
Layout clearances

Resolution:
The  INSTALLATION OF SWITCHBOARDS Bulletin Page 8 attached below,  shows clearances definition as:

4.2.1 Clearance from Walls
Clearance from walls (not rear accessible)—minimum of 1/2 inch
4.2.2 Working Clearances
Working clearances vary substantially depending on voltage and specific applications. See Section 110.26 of the National Electrical Code.
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