Why NSX-HB1 is mandatory used?

[yangchi-schneiderChina]

Dear All:

I have a case. Please see the picture below. It is allowed to use NSX-L type for distribution load protection. Why dose NSX-HB1 type is mandatory used for motor load under the same transformer? the system voltage is 500V. If you need the original file please let me know. chi.yang@se.com

Thanks a lot in advance. 

[Genghiz · Accepted solution]

Dear Chi,

Thanks for the given project file for the analysis.

For your information, the selection of ‘motor starter(s) and the possible protection device(s)’ are defined as a coordination, by the line of business. Ecodial is making the selection based on the same.

For the network voltage ; 500 volts

For the motor ratings of ; 22 kW or 30 kW

For the startup type; DOL type

For the thermal Protection Type, as 'integrated or separated', and

based on the selection of coordination; there are only a few possible solutions available. 

Type 1	Type 2
GV3L 40 GV3L 50 GV3P 40 GV3P 50 NSX 100*  MA 50 * Micrologic 2.2-M 50A *  Micrologic 6.2 E-M 50A	GV3L 40 GV3L 50 GV3P 40 GV3P 50 NSX 100 HB1  MA50 * Micrologic 2.2-M 50A *  Micrologic 6.2 E-M 50A NSX 100 HB2  MA50 * Micrologic 2.2-M 50A *  Micrologic 6.2 E-M 50A

So, You will be getting the result from one this possible solution.

Thanks & Regards,

Ecodial Expert Support

[Genghiz]

Dear Chi,

To comment on the image, enclosed by you.

There is no relationship (Or an influence) between the 'protection device' proposed for the load circuits over the motor circuits.

Thanks & Regards,

Ecodial Expert Support