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WHEN WIRING UP A ELECTRICAL MOTOR WHAT IS AN UNGROUNDED LINE...

<< Back to: Electrical Wiring FAQ (Part 1 of 2)

Question by RICHARD MILLIKEN
Submitted on 9/25/2003
Related FAQ: Electrical Wiring FAQ (Part 1 of 2)
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WHEN WIRING UP A ELECTRICAL MOTOR WHAT IS AN UNGROUNDED LINE ? IS IT THE NEUTRAL WIRE ? WHAT IS THE LINE ? IS IT THE HOT WIRE?


Answer by r3
Submitted on 10/16/2003
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the ungrounded wire is the hot wire and the line si the supply to the motor the load is the motor L1 is black L2 is white assumming that you are dealing with 120v 1 ph if not then L1 is hot and L2 is hot.220v 1hp.

 

Answer by Dan
Submitted on 1/27/2005
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Recently I was hooking up roughneck steam fans at an oil refinery in northern Canada.  The plant is undergoing millions, possibly billions of dollars of repair due to a fire.  The fans were to be connected to GFI circuits on explosion proof systems.  Explosive gases are a constant threat especially when disassembling the equipment to be repaired.  Because the grounded conductor (not the grounding conductor for connecting a grounding system to the neutral at the main disconnect)which I understand to mean neutral would be the opposite of the ungrounded line.  Some of the other electricians believed that this was incorrect and said that line means hot and ungrouned line means neutral.  They also claimed that the GFI circuits would trip for some reason, which they didnītīt, (revealing that they donīt understand how a GFI functions)and another said that the motor would run backwards (revealing that he further didnītīt understand that one reverses leads 2 and 8 for rotation).  Prior to this term on motor winding labels motors were labeled line 1 and line 2.  Often the label would indicate that line two was the neutral.  This would agree with line 1 being the ungrounded line.  If ungrounded line means neutral and grounded means hot then we would experience a popping sound near the source of the circuits if you connected a ground to the hot wire but would do nothing if you connected a ground to the neutral.
Conclusion:
I realize that there are many reasons for changing definitions and and sometimes definitions change with different types of voltages and systems.  I honestly would like to know what the motor manufacturer means by ungrounded line on his wiring diagram
Sincerely
Dan

 

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