ECN Forum Forums Code Related Discussion NEC & other Code issues NEC requirements for installing twist lock receptacle

What is the minimum box volume required for a L5-30R receptacle? This is a 125V, 30A, single phase twist-lock receptacle. Is a 4" box required or is a 2" single gang box acceptable. Also are there any special mounting requirements due to the twisting action required. Can the box be tabbed directly to the drywall opening with no attachment to wall framing (for after the fact installation). Thanks in advance.