Straight blade 15A and 20A receptacles are often used in branch circuits whereby they are normally not all filled. There is also the exception that a 20A branch circuit can feed 15A receptacles. Twist Lock circuits are almost always dedicated (one breaker per receptacle) so the breaker is the over-current protection as well. One wouldn't want a 20A device plugged into a 30A circuit.
In the lower Amperage (15A), you can get those in locking duplex too and set them up as branch circuits. But, if you have a device that needs a 20A twist lock plug, you are essentially saying, it is going to need more than 15A and therefore it gets its own circuit.
In a residential situation, rarely do you see 20A receptacles as there are very few places where more than 15A needs to be planned for. Obvious areas are the clothes dryer...which is is more than 20A and you can't plug your 15A plug in there...and the oven...where again, it is more than 20A and you can't plug your 15A plug into either. The only place that comes to mind where residential calls for a 20A receptacle is by the washing machine. That is a "designated" receptacle that has its own 20A service to ensure it can handle both a washing machine and a gas fired clothes dryer.
USB-C is light years better than micro-USB, in terms of how well it stays in. Mini-USB is too easy to break the connector.
In the lower Amperage (15A), you can get those in locking duplex too and set them up as branch circuits. But, if you have a device that needs a 20A twist lock plug, you are essentially saying, it is going to need more than 15A and therefore it gets its own circuit.
In a residential situation, rarely do you see 20A receptacles as there are very few places where more than 15A needs to be planned for. Obvious areas are the clothes dryer...which is is more than 20A and you can't plug your 15A plug in there...and the oven...where again, it is more than 20A and you can't plug your 15A plug into either. The only place that comes to mind where residential calls for a 20A receptacle is by the washing machine. That is a "designated" receptacle that has its own 20A service to ensure it can handle both a washing machine and a gas fired clothes dryer.
USB-C is light years better than micro-USB, in terms of how well it stays in. Mini-USB is too easy to break the connector.
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