Max ocpd?

[Tsartwig]

New to electrical sort of only been in 2 yr and confused by this nameplate. Asked to get the ocpd off it but how can you tell? All it has on it is

1hp 7.6fla 1ph 60hz no other info.

 

[charlie b]

There should also be a voltage rating. Are you sure it was not also on the nameplate? The values you show are not consistent with any motor listed in table 430.248, so I cannot infer the voltage from your data. We need to size the OCPD at least 125% of the full load current. That would put you just under 15 amps, and that would be the breaker size that I would select.

Welcome to the forum.

 

[Dennis Alwon]

7.6 amps

use Table 430.52 and look under inverse time breaker for a poly phase motor

250% of the fla

7.6 x 2.5 = 19

Article 430.52 allows us to use the next standard size breaker 20 amps

I assume 3 phase but even single phase it is the same

 

[Tsartwig]

The rest of the info is missing due to the nameplate being broken. There is a breaker on the unit that is a 60 amp one already.

 

[Dennis Alwon]

There should also be a voltage rating. Are you sure it was not also on the nameplate? The values you show are not consistent with any motor listed in table 430.248, so I cannot infer the voltage from your data. We need to size the OCPD at least 125% of the full load current. That would put you just under 15 amps, and that would be the breaker size that I would select.

Welcome to the forum.

Charlie I believe the overcurrent protective device can be sized by Table 430.52 at 250%

 

[Dennis Alwon]

What is this unit-- A motor???? 60 amps is way too high if it is a motor

 

[Tsartwig]

It is an ac unit.

 

[Dennis Alwon]

It is an ac unit.

That changes things to 175%(generally)... 175% x 7.6= 13.3

13.3 amps so a 15 amp breaker is max....

 

[Dennis Alwon]

Here is the article

440.22 Application and Selection.
(A) Rating or Setting for Individual Motor-Compressor.
The motor-compressor branch-circuit short-circuit and
ground-fault protective device shall be capable of carrying
the starting current of the motor. A protective device having
a rating or setting not exceeding 175 percent of the motor compressor
rated-load current or branch-circuit selection
current, whichever is greater, shall be permitted, provided
that, where the protection specified is not sufficient for the
starting current of the motor, the rating or setting shall be
permitted to be increased but shall not exceed 225 percent
of the motor rated-load current or branch-circuit selection
current, whichever is greater.
Exception: The rating of the branch-circuit short-circuit
and ground-fault protective device shall not be required to
be less than 15 amperes.

 

[Tsartwig]

Ok cool thanks. Sorry for the lack of info. Ill chalk that to my lack of expeirence as well as partial nameplate.