Is NEC specific on fastening methods for j-boxes?...
... i.e. does it specify size and number of nails to affix "deep" ceiling fan box to wooden rafter, allow/disallow powder-shot fasteners for attaching wet-loc box to concrete, etc.?
Are chemical anchors (i.e. epoxy, acrylic) ever allowed?
Are there pullout-test stds.?
Or is it just vague language, such as "must be securely attached"...?