I order to do this all the wire need to be replace with three wire.
The neutral.
The negative wire is grounded.AnswerThe negative wire is grounded.
You don't. Do not power a water feature without a grounded cord.
More details needed. It might be how to wire the stator inside the motor or how to connect the supply. If the latter it has three connections for three live wires plus possibly a neutral. You need to find out if the connection is delta or star and you need to check that the voltage is right. Lastly the case needs to be correctly grounded. If in doubt ask an electrician.
yes
Star and delta connection
There should be no voltage to ground on a delta system. That is the reason that these types of systems have to have a set of grounding lights to warn when the system inadvertently grounds. A delta system is a three wire connection, no neutral. A voltage to ground is only available on a three phase four wire (star or wye) connection system. The fourth wire being a neutral which is grounded thereby giving a voltage from each leg to neutral.
If they are grounded they get an electric shock or electrocuted. If they are not grounded or in simultaneous contact with the neutral wire, nothing. That's why birds can sit on a high voltage wire and survive; they are not grounded.
either the neutral safety wire is not grounded, or hoodpin wire is grounded. or the fuse is blown
If you are referring to a.c. three-phase systems, then a three-wire system is associated with a delta-connected system, while a four-wire system is associated with a star, or wye, system. The conductors being three line conductors and a neutral conductor.
no it will mess up the reception