The wiring regulations in your country must be followed and if you need to ask it means you should employ an electrician to do the work.
Yes the wire size is larger for that size breaker but will not effect the 30 amp breaker protection of that circuit.
Look on the heater and see what amps it is pulling. That will determine the wire size and breaker size. It must be on a dedicated circuit. 15 amps = AWG # 14 wire with 15 amp breaker 20 amps = AWG # 12 wire with 20 amp breaker 30 amps = AWG # 10 wire with 30 amp breaker 40 amps = AWG # 8 wire with 40 amp breaker
The wire size is dependent upon the wattage size of your water heater. The higher the wattage the larger the wire size. A standard 3000 watt heater will use a two pole 20 amp breaker connected to 2C #12 wire.
There should be two outputs on the 30 A breaker. You will need 10 AWG wire with 3-conductors and ground. Typically the wire colors will be Black, Red, White and (Green or bare). Connect black to one output of breaker and red to other output. Connect white to the white buss bar in main panel and green/bare to ground buss bar. At heater end connect the red and black to the 240 V leads, white to white and green/bare to the heater case.
8 AWG.
Yes the wire size is larger for that size breaker but will not effect the 30 amp breaker protection of that circuit.
1 d0nt kn0w but have fun
does a water heater require a ground wire?
Look on the heater and see what amps it is pulling. That will determine the wire size and breaker size. It must be on a dedicated circuit. 15 amps = AWG # 14 wire with 15 amp breaker 20 amps = AWG # 12 wire with 20 amp breaker 30 amps = AWG # 10 wire with 30 amp breaker 40 amps = AWG # 8 wire with 40 amp breaker
You have a short in the wire to the heater or the heater is no good, easy way to check with a ohm meter is to pull wire off heater (at the heater) and do a ohms check from the wire to ground (metal part of car). If it shows 0 or near 0 then you have a shorted wire if it shows open then its the heater that bad!
In the heater you will have two wires. You should then have 2 supply wires from the panel, and 2 wires from the thermostat. The neutral (white) supply wire should go to one of the wires on the heater. The hot (black) supply wire should connect to one wire from the thermostat. The other wire from the thermostat will connect to the other wire from the heater.
10/3 wire with 30 amp double pole breaker from panel box to water heater.
The neutral wire is open, or has a bad connection.
The wire size is dependent upon the wattage size of your water heater. The higher the wattage the larger the wire size. A standard 3000 watt heater will use a two pole 20 amp breaker connected to 2C #12 wire.
Wire is sized by the amperage that it is allowed to legally carry. To answer this question the amperage that you need at the garage must be stated. Also the distance to the garage must be stated. With this information the calculation can be made.
Too expensive. Ni-chrome wire is cheaper.
There should be two outputs on the 30 A breaker. You will need 10 AWG wire with 3-conductors and ground. Typically the wire colors will be Black, Red, White and (Green or bare). Connect black to one output of breaker and red to other output. Connect white to the white buss bar in main panel and green/bare to ground buss bar. At heater end connect the red and black to the 240 V leads, white to white and green/bare to the heater case.