Query on DOL Starter
Query on DOL Starter
(OP)
we have got 2 Fan motors of 0.5 HP Each. Our service engineer says that we need not provide any seperate starter for motor capacities till 1 HP. But in my career all through out I have ran fan motors of even 0.1 HP also with starter only.
Can you please advise if for motors less than 1 HP we don't need any starters ?
Can you please advise if for motors less than 1 HP we don't need any starters ?





RE: Query on DOL Starter
In addition to electrical codes there may be safety codes that require a disconnecting means for each motor.
In Canada:
And
Safety codes often require a disconnect adjacent or near a motor. A manual motor starter is often use to meet this safety requirement.
Bill
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"Why not the best?"
Jimmy Carter
RE: Query on DOL Starter
* the term "clearly" is open to interpretation. I've seen some simply have a code on the nameplate that says "TP", meaning "Thermally Protected" in English, which may be completely useless to someone in Sweden or Malaysia...
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: Query on DOL Starter
1) is the motor single-phase and provided with integral thermal-protection (ie Klixon)?
2) what means of disconnect is required? ie local or centrally located in a MCC?
3) is the motor 3-phase?
4) what is the availability of 1-phase and 3-phase power?
5) how far is the voltage source from the motor? ie is voltage drop an issue?
6) what type of control is required, or can the motor run continuously?
7) what is required reliability? a single-phase motor is not as reliable as a 3-phase motor.
8) what industry are we talking about here? or is this a commercial installation where initial cost is the only concern.
9) etc, etc, etc