30A Hydraulic Lift on 50A Circuit

[GotShocked]

We have a 480V 3-Phase 30A Hydraulic Shop Lift that we would like to plug into an existing 480V 3-Phase 50A outlet. Can we replace the 30A plug on the lift cord with a 50A plug so that we can use the existing 50A receptacle?

Thanks for the help.

 

[infinity]

I would think that the lift came with a 30 amp plug for a reason and that it's connected to not a 50 amp but a 30 amp circuit. A single 50 amp receptacle on a 30 amp circuit would be code compliant.

 

[petersonra]

I guess it comes down to what does the instructions say that came with the plug say? does it have a minimum conductor size listed?

If I had to guess, the OCPD rating of a 50A branch circuit might well be adequate for a motor circuit of this size.

The only question is whether the 30A plug can be protected by a 50A branch CB.

Article 406 (receptacles and plugs) does not seem to require a 30A OCPD on a 30A plug so i would just make up an adapter.

240.3 Other Articles. Equipment shall be protected against
overcurrent in accordance with the article in this Code that
covers the type of equipment specified in Table 240.3.

Table 240.3 Other Articles
Equipment Article
Receptacles 406

 

[LarryFine]

. . . or hard-wire it.

 

[petersonra]

. . . or hard-wire it.

while it is a perfectly safe idea, I am not sure it would meet code requirements.