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Question:

House electric wiring -are push pin connectors code?

If you have for example four #12 wires to connect together, it's a pain to twist them together. I've seen the push pin type of connectors with four slots. They seem very convenient. For you licensed electricians out there, are they code in a typical residential junction box?

Answer:

Push Pin Connectors
If I understand you correctly you are referring to the holes in the back of the receptacle. We call that back stabbing and it is only allowed on 15 amp general purpose receptacles. And the receptacle will not accept #12 wire, only #14. In addition (as the others have pointed out) it is a very poor quality connection. Don't do it. It is allowed by NEC but that's no excuse to go cheap or get lazy. Spring for a pair of lineman's pliers to make twisting the wires easy. You will need Red wire nuts for 4-5 #12wires. If you are referring to the push in style connectors, my experience has been that they too make a poor quality connection for receptacle use. I once connected 9 recessed lights using the factory supplied push in connectors. Thought I'd save a couple of minutes and a buck or two on yellow wire nuts. Of the 9, 6 failed to light up. I had to go back in, remove those connectors and replace them. My savings went right out the window! But it's your choice.
Code is not the issue nor is convenience. UL listing is required for the connectors. Also the wire nuts are more secure and will carry a larger amount of current. I'm not sure what the push pin type connectors are or where you might have seen them. Many receptacles and switches are a push type quick connect where the wire must be stripped and then the it is inserted in a small hole in the back of the device. These fail when a sudden heavy load is applied because the only electrical connection is a couple of brass points about the size of a needle.
As far as I know, the connector type you mention is not approved by code. If push-pin connectors are the type I'm thinking of, they are not up to the task. There is not enough contact area between the wire and the contact for a good, high-current connection. I suggest you stay with the wire nuts. They are proven to be reliable when installed properly.

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