Definition
The NEMA L6-30 is a locking (twist-lock) receptacle rated 250 volts and 30 amps, carrying two hot conductors and a ground but no neutral. The 'L' denotes the locking body: the plug is inserted and twisted so it cannot be pulled loose by cable weight or vibration, which is exactly what you want for a continuously running miner. It is one of the most popular outlets for powering an individual ASIC or a small cluster.
Why miners favour it
At 240V, a 30A circuit provides a nominal 7,200W, with a code-limited continuous draw around 5,760W (80% of 30A). That headroom covers a single high-end ASIC and its PSU with margin, and running the supply at 240V rather than 120V improves efficiency and reduces current on the conductors. The locking connection also resists the heat-cycling loosening that plagues straight-blade outlets under sustained high current.
Installation reality
An L6-30 needs a dedicated double-pole 30A breaker and appropriately sized copper (commonly 10 AWG). Because there is no neutral, it delivers only 240V loads and cannot supply 120V devices. Many home and small-shop miners standardise on L6-30 drops so any ASIC can be relocated without rewiring.
Watch the derating
The 80% continuous rule is not optional for a 24/7 load. Sizing a miner that draws close to 30A onto an L6-30 leaves no margin; matching the device nameplate to the circuit with headroom is the safe practice.
For the standard home outlet it replaces see the NEMA 5-15 receptacle, and for an even higher-current option see the NEMA 14-50 receptacle.
Size your circuit against the ASIC PSU reference.
In Simple Terms
The NEMA L6-30 is a locking (twist-lock) receptacle rated 250 volts and 30 amps, carrying two hot conductors and a ground but no neutral. The…