Two Questions for Motor Starter in labeling issue of the electrical design.

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augie47

augie47

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Staff member
Location
Tennessee
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State Electrical Inspector (Retired)
Not sure I understand the question but the motor starter "MS" consist of contacts and a magnetic coil. Each set of contacts are identified by "***MS" and the coil identified by the motor started ID "507".
Together they make up the complete starter "507"
 
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reaplaypolo

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Location
West Virginia
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Instructor
Dear Professional Sir,

Thank you so much for your kind response.

So as I understood, In the electrical drawing, we can use to label about the MS for symbol for contactor (relay) and Mangnetic coil? right?
 
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EC Dan

Senior Member
Location
Florida
Occupation
E&C Manager
It's about how they are represented in the CAD software. A motor starter is a single object, with a contactor element and a coil element. Each element of the object is represented by a separate symbol. The tag for this object is 507MS and is applied to both symbols. The symbol would usually have the terminal numbers on them as well, like the control relay to the left in the second picture (assuming CR is control relay). The device type designation can be whatever you want, but is usually standardized within an organization. In this case the designer used MS for the contactor/coil device.
 
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