It is generally incorrect for two L6-20 outlets to share the same source breaker.Reasons



Overload Risk

L6-20 outlets are rated for 20 amps. If two L6-20 outlets are connected to the same 20-amp breaker, it is possible for both outlets to draw 20 amps simultaneously, overloading the breaker and potentially starting a fire.

Code Requirements

According to the National Electrical Code (NEC) and other electrical safety codes, each L6-20 outlet must be protected by its own dedicated overcurrent protection device (circuit breaker or fuse).

Voltage Drop

When multiple outlets are connected to a single breaker, the voltage drop across the circuit can increase, particularly if the outlets are heavily loaded. This can lead to insufficient voltage for equipment connected to the outlets.

Exceptions

There are some exceptions to the rule that L6-20 outlets must be on separate breakers:

Connected to a Transformer

If the L6-20 outlets are connected to a transformer that provides isolation and isolation transformers are installed then these methods can be fine.*

Part of a Multi-Wire Branch Circuit (MWBC)

MWBCs allow two 120-volt outlets to share a single 240-volt circuit breaker. However, the outlets must be properly labeled and connected according to code.

Conclusion:

In general, it is not recommended to connect two L6-20 outlets to the same source breaker unless the specific application meets the exceptions outlined above. Doing so can increase the risk of electrical hazards and code violations. Flag for review