How to connect the EP500 Pro to the US utility power
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3.2 NEMA L14-30R inlet Box
NEMA L14-30 connect to the transfer switch, plug the L14-30R of the L14 extension cord.
https://www.amazon.com/Reliance-Controls-Corporation-PB30-Generators/dp/B000BQT47S/ref=pd_bxgy_img_sccl_1/142-1707139-
6977663?pd_rd_w=8wVnX&content-id=amzn1.sym.7757a8b5-874e-4a67-9d85-54ed32f01737&pf_rd_p=7757a8b5-874e-4a67-9d85-
54ed32f01737&pf_rd_r=FF4D3M7RGM6JJEM7AVJ2&pd_rd_wg=K9W0F&pd_rd_r=ef64e305-ec59-4a2c-baf7-5874507a8b5e&pd_rd_i=B000BQT47S&th=1
3.3 NEMA L14 extension cord:
If you want to get 10 FT NEMA L14 extension cord , the referenced purchase address as following
https://www.amazon.com/VOGREX-Generator-Extension-L14-30P-L14-
30R/dp/B099R9YWT8/ref=sr_1_2?crid=N3G3QLMF57TD&keywords=nema%2Bl14%2Bextension&qid=1658719628&sprefix=name%2Bl14%2Bextention%2Caps%2
C249&sr=8-2&th=1