NEMA Type II (2) motor terminal boxes

[peterhodo]

MG-1 is not clear as to what terminal box must be used when standoff insulated terminals are required. No where does it state that when a standoff insulator is used that the box must be a Type II terminal box. Is it possible that by definition, elsewhere within NEMA, that a terminal that is standoff insulated is a Type II terminal? If this is true then one would be required to use a "Type II terminal" box with the spacing as defined in MG-1. This question applies to a 1500 HP, 4160/3/60 volt compressor motor.

Thanks,

Pete

 

[7anoter4]

I don't think that there is a standard which states if the terminal box shall be standoff type II or direct connected to supply cable.
Low voltage motor is provided with terminals always. It is easy to connect, test and repair. Medium voltage Type II has the same advantages.
The remaining space may be used for capacitor or surge protector also.
Some times is a problem to provide such a big terminal box, for instance if the motor is located in hazardous location and in order to be explosion resistant the box is provided with thick walls and limited room so no insulators could be located in this box. Some Power Stations prefer Type II due to maintenance problems, nevertheless it requires more space to access.