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Can the QMB326W or QMB366W be converted to accept Class J fuses?

How Can a QMB fusible switch be converted to accept Class J fuses?  

Product Line:
QMB fusible panelboards 

Installation/product features

To convert the QMB326W or QMB366W for use with Class J fuses, relocate the load base assemblies and insulators to the mounting location nearest the line base assemblies.  This information is located on the switch's wiring diagram.
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