I had a swimming pool pump
(1) and next to it a device
(2) that measures the Ph and other stuffs with smaller pumps to add chlorine, etc.
Both devices where connected to sockets
next to each other, with the same line from mains using Wago connectors
Diagram:
The pump broke, and the company changed it for a new one. The new one works fine, but now the slow-blown fuse
(3) of the measurement device breaks all the time.
The company that installed the pump is saying that the installation is probably defective, and the problem cannot be the pump, but when i connect the pump to a different wire (same phase, just longer wire) then everything works fine
Diagram:
What could be the issue?
Is there any way I could measure the noise (or whatever) with an oscilloscope and differential probes?
Thank you very much!