Magnetic starter rating
#1
02-02-10, 10:33 PM
Join Date: Feb 2010
Posts: 1
Upvotes: 0
Received 0 Upvotes
on
0 Posts
Magnetic starter rating
can someone help me with this problem?
I have a 37-A motor. I would like to know the rule of thumb in choosing the right or safe rating of the magnetic starter.
tnx in advance...
pls. reply ASAP...I will appreciate it more if you can reply thru my email...tnx again
I have a 37-A motor. I would like to know the rule of thumb in choosing the right or safe rating of the magnetic starter.
tnx in advance...
pls. reply ASAP...I will appreciate it more if you can reply thru my email...tnx again
Last edited by ibpooks; 02-03-10 at 08:28 AM. Reason: E-mail addresses are not allowed in public forums. You can subscribe to the thread to get e-mail notifications of replies.
#2
02-02-10, 10:58 PM
Join Date: Mar 2006
Location: Wet side of Washington state.
Posts: 16,321
Received 38 Upvotes
on
30 Posts
Motor starters are sized according to horsepower, voltage and whether single or three phase. Once that selection has been made then the heater elements are selected according the full-load amperage of the motor. Generally the heater amperage rating is no more than ten percent greater than the full-load current but it can depend upon other specifications of the motor and the installation.
Last edited by ibpooks; 02-03-10 at 08:32 AM. Reason: Housekeeping.
#3
02-03-10, 04:59 PM
Member
Join Date: Aug 2008
Location: boston, mass
Posts: 59
Upvotes: 0
Received 0 Upvotes
on
0 Posts
you dont want to ballpark this, give us the exact info on the nameplate of the motor you are working down to every single detail because there is a chapter in the NEC that will allow us to do the calculations for you so reply back with that info, and someone will reply back with the exact size you need to use
#4
02-03-10, 05:32 PM
Member
Join Date: Mar 2006
Location: NE Wis / Paris France{ In France for now }
Posts: 4,364
Upvotes: 0
Received 2 Upvotes
on
2 Posts
As other mention the key issue is motor HP size and single or three phase ., and also how often the motor will kick on like every few minutes or steady run or what ?
That can affect the size of starter as well.
And there is push button in two verion and simple on / off switch as well.
Merci,Marc
That can affect the size of starter as well.
And there is push button in two verion and simple on / off switch as well.
Merci,Marc
#5
02-03-10, 09:08 PM
Member
Will you also be needing a disconnect. You can get a combination starter with fusible disconnect and save the cost and labor of installing a separate disconnect. Will you be needing pilot lights, push buttons, control power transformer, remote push buttons?
