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Answer:
This box is to connect your generator to the transfer switch, not to connect any sort of load (like your welder) to the generator or panel.
As an aside, if your welder is 50A @ 220v then that's 11,000 watts and way over the rating of your generator.

Kelly
· August 9, 2014
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You are correct. The image is wrong, It's of a PB20 box. It's just the photo that's incorrect. You'll get the 30amp box if you order this item. I did and I was happy when it came.
Richard Bristol
· October 31, 2014
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Hello and thanks for your question! The PB30 inlet box is just a plug for a generator cord in an outdoor rated enclosure. It is used to connect a generator cord and then bring the wiring into a building to connect to what should be a transfer switch or device. The wiring from the PB30 brought inside doesn’t have to c… see more Hello and thanks for your question! The PB30 inlet box is just a plug for a generator cord in an outdoor rated enclosure. It is used to connect a generator cord and then bring the wiring into a building to connect to what should be a transfer switch or device. The wiring from the PB30 brought inside doesn’t have to connect to a transfer switch for the power to be utilized, but every state law requires a transfer device to connect generator power to. Hope this helps! see less Hello and thanks for your question! The PB30 inlet box is just a plug for a generator cord in an outdoor rated enclosure. It is used to connect a generator cord and then bring the wiring into a building to connect to what should be a transfer switch or device. The wiring from the PB30 brought inside doesn’t have to connect to a transfer switch for the power to be utilized, but every state law requires a transfer device to connect generator power to. Hope this helps!
Reliance Controls
Manufacturer · May 31, 2018
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Answer:
Hello, the correct wire is typically referred to as 10/3 with ground, but yes 10/4 would be the correct amount of wires. Reliance Controls videos have the 10/3 with ground used in install videos. Any other video done by others may not have the correct wire.
Reliance Controls
Manufacturer · October 9, 2020
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50 amp plug is better particularly when using 220v. The gen. should have it's own breaker. Remember bigger is always better.
Amazon Customer
· March 3, 2016
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Reliance Controls PB50 50-Amp (CS6375) NEMA 3R Power Inlet Box, Gray
MikeK
· October 26, 2020
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Yes, if your generator has a L14-30/240V outlet (which it should). You can then run a 30 amp, 240V power cord between the generator and power inlet box.
Jasper Generators LLC
Seller · February 18, 2018
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Only if the transfer has more than one input for the auxiliary power connection, that is, the transfer must come equipped with that capacity
Ervins K. F
· July 28, 2019
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First of all if the inlet box is wired for 220v you will need the female plug to a preferably 10/4 cable. This cable is then connected to 3 prong 30amp male generator plug using only the 120v portion of the wiring. Note, using black, white, and the green ground wire only. one of the black lines should be tied off (disc… see more First of all if the inlet box is wired for 220v you will need the female plug to a preferably 10/4 cable. This cable is then connected to 3 prong 30amp male generator plug using only the 120v portion of the wiring. Note, using black, white, and the green ground wire only. one of the black lines should be tied off (disconnected) Are you mean 120v breakers at the gen., or in the house? If in the house are the breakers independent of one another, or are they tied together? see less First of all if the inlet box is wired for 220v you will need the female plug to a preferably 10/4 cable. This cable is then connected to 3 prong 30amp male generator plug using only the 120v portion of the wiring. Note, using black, white, and the green ground wire only. one of the black lines should be tied off (disconnected) Are you mean 120v breakers at the gen., or in the house? If in the house are the breakers independent of one another, or are they tied together?
Amazon Customer
· January 23, 2016
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Answer:
Hello and thank you for reaching out! The PB30 NEMA 3R Power Inlet Box is UL approved. Should you have any other questions, feel free to email us directly at amazonsupport@reliancecontrols.com
Reliance Controls
Manufacturer · November 26, 2018