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Deoends on code you are governed by. In USA, a GFCI outlet or a circuit controlled by a GFCI circuit breaker would be required.
Connect incoming power to the line side of GFCI outlet and plug Jacuzzi into the outlet. Must be on a dedicated circuit. If it has a pump and heater then each one must be on dedicated GFCI protected circuit.
Yes, you install a GFCI on a 2 wire circuit.
Not if the GFCI breaker is supplying the circuit you are wanting to put the GFCI receptacle into.
It could be that the bathroom circuit simply has more on it so the hair dryer is pushing the circuit beyond its limit. In a typical bathroom, properly wired, this would not be the case. But if there are lights on the circuit other than in the bathroom (it would take a lot of lights for this to be a problem), or if there is a source of heat in the bathroom that is on, this may be where your problem is.
Deoends on code you are governed by. In USA, a GFCI outlet or a circuit controlled by a GFCI circuit breaker would be required.
Connect incoming power to the line side of GFCI outlet and plug Jacuzzi into the outlet. Must be on a dedicated circuit. If it has a pump and heater then each one must be on dedicated GFCI protected circuit.
NEC states that all GFCI's require a 20 amp circuit, the wire size for a 20 amp circuit is 12 gauge.
Most new wiring codes require dedicated circuit(s) for bathrooms. If the lights are dimming excessively, this could be an indication of a loose connection, which is a fire hazard. Have it checked by a qualified electrician - SOON. The service call is cheap, compared with what a fire could do. run a dedicated gfci line to your bathroom
No, it must be on a dedicated circuit of it's own. It must be on AWG 12/2 wire with 20 amp breaker. It also must be protected with a GFCI outlet.
Yes, you install a GFCI on a 2 wire circuit.
Not if the GFCI breaker is supplying the circuit you are wanting to put the GFCI receptacle into.
GFCI (or Ground Fault Circuit Interrupter) should always be installed anywhere there is a possibility of the "plug-in" getting damp or wet, such as the Kitchen or Bathroom, also it doesn't hurt to use a GFCI in rooms used by children as they trip much faster on a fault than circuit breakers (if the kid sticks something in the plug in)
GFCI recepticles are not required outside the bathroom so in the event of a current path from the dryer through the user to the ground / plumbing (faucets, water, drains), the path would not open until 15 amp circuit current is exceeded which is hundreds of times the fatal dose of current to the user. Bathroom GFCI recepticles detect the slightest current and break the circuit in an instant.
It could be that the bathroom circuit simply has more on it so the hair dryer is pushing the circuit beyond its limit. In a typical bathroom, properly wired, this would not be the case. But if there are lights on the circuit other than in the bathroom (it would take a lot of lights for this to be a problem), or if there is a source of heat in the bathroom that is on, this may be where your problem is.
No, it can be on a circuit with conventional outlets.
No, you could use a GFCI circuit breaker instead.