ganutenator
Lifetime Supporting Member
I don't want to state the obvious to those in the know, but I wasn't in the know.
Apparently, the way dc switching power supplies work, they are the cause of most noise.
When I say noise, let me explain.
We were doing an install.
Customer complained that his crescent wrench sparked on the machine and that he got a jolt.
I measure the voltage in ac from the equipment to ground. It was aprox 20VAC.
We both walked back to the panel.
Everything was turned off except for the 24dc power supply.
I was like, bet the ground wire isn't landed.
Sure enough, the electricians had yet to land the ground wire.
Apparently, the way dc switching power supplies work, they are the cause of most noise.
When I say noise, let me explain.
We were doing an install.
Customer complained that his crescent wrench sparked on the machine and that he got a jolt.
I measure the voltage in ac from the equipment to ground. It was aprox 20VAC.
We both walked back to the panel.
Everything was turned off except for the 24dc power supply.
I was like, bet the ground wire isn't landed.
Sure enough, the electricians had yet to land the ground wire.