Torque motors and branch circuit sizing

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Isaiah

Senior Member
Location
Baton Rouge
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Electrical Inspector
It used to be we'd size motor branch circuit based on locked-rotor current for motors that may see high torque during 'stall' scenario, such as a storage tank mixer motor. (Same was true for MOV's, i.e. motor operated valves). According to 430.52 and 240.4(B) however, this is no longer the case...or am I missing something?
 
Isaiah said:
It used to be we'd size motor branch circuit based on locked-rotor current for motors that may see high torque during 'stall' scenario, such as a storage tank mixer motor. (Same was true for MOV's, i.e. motor operated valves). According to 430.52 and 240.4(B) however, this is no longer the case...or am I missing something?
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Locked-rotor current is still used to determine conductor size, overload size and SC/SF protection size for torque motors. See 430.6(B).
 
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