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<blockquote data-quote="Rob Spence" data-source="post: 24675" data-attributes="member: 80">Re: When L21-30 just isn&#039;t big enoughI will take shot at it.Only YOU know what your use of a connecter is. There is no way for the circuit breakers to know if there are just 120v things connected or that a 240v thing is connected. It would be dangerous if on an overload it only tripped one side of the line as it would leave voltage still on other pins of the connector. Depending on the use, it could kill someone.Your example isn&#039;t the same at all because of way the circuits are protected. A L5-30 is considered a circuit as is a L14-30. The circuit has a single disconnect.Also, the code does require bonding or ground and neutral at one and only one location. See Article 250.24 of the NEC for a full explanation. The usual case is to bond in the service panel connected to the service drop after the meter.</blockquote>

[QUOTE="Rob Spence, post: 24675, member: 80"] Re: When L21-30 just isn't big enough I will take shot at it. Only YOU know what your use of a connecter is. There is no way for the circuit breakers to know if there are just 120v things connected or that a 240v thing is connected. It would be dangerous if on an overload it only tripped one side of the line as it would leave voltage still on other pins of the connector. Depending on the use, it could kill someone. Your example isn't the same at all because of way the circuits are protected. A L5-30 is considered a circuit as is a L14-30. The circuit has a single disconnect. Also, the code does require bonding or ground and neutral at one and only one location. See Article 250.24 of the NEC for a full explanation. The usual case is to bond in the service panel connected to the service drop after the meter. [/QUOTE]

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