Enclosures not over 100 cubic inches are considered to be adequately supported where two (2) or more conduits are threaded wrenchtight into the enclosure.
An enclosure can be defined as any part of a material that is used to physically separate the external surface from the internal environment such as in:
According to the National Electrical Code (NEC), any enclosure that cannot exceed 100 cubic inches (1640 cubic centimeters) in size, with threaded entries and do not contain a device are considered to be adequately supported only where two (2) or more conduits are threaded wrenchtight into the enclosure while each conduit is secured within 3 feet of the enclosure.
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