![]() ![]() Article 336 says that "the ampacity of type TC tray cable shall be determined in accordance with 392.80(A) for 14 AWG and larger conductors, in accordance with 402.5 for 18 AWG through 16 AWG conductors where installed in cable trays, and in accordance with 310.14 where installed outside of cable trays, where permitted." Thank you Cowboy, Dennis, Old Sparky, and Cow for your responses -Ĭow is correct that the VFD cable I have in mind is rated TC-ER. With this being the case, for the purpose of determining the required size (AWG) for my conductors, should I be looking at table 310.16 or Article 400. ![]() The cable will be routed from the VFD to the motor as necessary and secured in place before the machine is put into service. In my application, however, it will not be required to flex or bend during use. The VFD cable I will be using is "flexible" in that I am able to bend it (specifications list the minimum bend radius as 7.5 x cable diameter). It is unclear to me for my application whether I should be consulting table 310.16 or if I should be consulting Article 400. What confuses me is that article 400 covers the ampacities of "flexible cords and cables". Table 310.16 in the 2020 NEC lists the ampacities of of "insulated conductors with not more than three current carrying conductors in raceway, cable, or earth." As my VFD cable will have three current carrying conductors, this makes me believe table 310.6 might be where I should look to determine what wire size (AWG) I should get for the cable conductors. ![]() The cable will have three current carrying conductors and one ground conductor. For the motor power cable from the VFD to the motor, I am planning to use a cable with a braided shield that is specifically intended for use with VFD's. I am working on a project in which I will be using a VFD to drive an AC motor. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |