# Need to connect neutral wire?

In 3 phase machines have L1,L2,L3,N and PE(Protective earth).some time Neutral wire is not connected to the power supply.But,Machine have a neutral wire.What will happen if not connect neutral wire?what is the usage of neutral wire for machines? In the installation neutral wire is note connected.Is it good idea?

• Depends on the machine. – Turbo J Jan 25 '15 at 20:42
• Find a diagram for that machine and determine, if the neutral is used. – sparky Al Jan 25 '15 at 21:24