Safety Tips for solenoid water valve and help for two water pump in parallel

Thread Starter


Joined Feb 27, 2021
1. Please give me some advice for solenoid water valve 220v AC
Is 6mm2 Bonded wire enough ?, or I needs larger ?, what's size I needs ? (In China BC wire size is 4mm2, 6mm2, 10mm2, 16mm2, 25mm2, 35mm2, 50mm2, ... till 500mm2)
2. For safety is two water pump in parallel system, with 2 solenoid valve, is bonded wire and RCCB 30ma enough to protects that installation ?
3. Where is ground bonding wire is need to install ?, solenoid valve body, water pump body ?, pipe is from PVC
4. Do you think if I use 2 pump parallelly with 33 liters per minute capacity, is enough to make water output at ~50-60 liters per minute ?

*solenoid valve 220v AC with metal body, pump is 2x 220v AC 3a with metal body, pump is located only 2 meters from lightning arrester ground rods, and bonded wire is connected directly to arrester and also main ground system


Joined Nov 6, 2012
1) What are the Amperage Ratings of the 2 Solenoid Valves ?
What does you local Electrical-Code say about wire sizes ?

2) A special Ground-Fault-Circuit-Breaker is always a good safety feature, BUT,
All Motors should have a "Bond-Wire" directly to a good Grounding-System.
Check your local Electrical-Code for Wire Sizes.
Normally, the Bond-Wire Size should be able to
easily handle the full Amperage-Rating of your Circuit-Breaker or Fuses,
without Over-Heating, or, excessive Voltage-Drop.

3) The Solenoids should have a built-in Ground-Screw, IF, they have a Metal Cover.
Epoxy covered Solenoid Coils, with NO Metal Cover, do not get a Bond-Wire.

4) 33L per minute .........
What type of Pump ??? Centrifugal, Positive-Displacement ???
At what pressure (Head) ???
With what sized Pipe ???
Do you have any flow restrictions, like an Inlet-Screen ???
How many Bends are in your Pipes ???
How long are your Pipes ???
The Pump manufacturer should have "Performance-Charts" that will provide more information.
The Pipes and Fittings can seriously reduce the amount of Flow.

Using a "Tee" Fitting to connect the 2 Pumps is a bad idea,
and will seriously reduce the Total-Flow-Capacity.