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Author Topic: 2 volts too much?  (Read 5269 times)

Frank DeWitt

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Re: 2 volts too much?
« Reply #20 on: December 13, 2017, 09:01:28 pm »

while we are all thinking about voltage drop on the neutral, vs the ground think about what happens when a surge protector does its thing.  A giant surge hits the AC feed to the booth.  The surge protector connects that crazy high voltage on both hot and neutral to ground.  Current flows through the ground developing a voltage.  Let's say 100 volts for just an instant. No problem.  The equipment has been saved.

But. There is a audio cable from the mixer in the booth to the amp on the platform.  Now the amp that didn't get a surge sees 100 volts coming down pin one.  It's own ground is (or was) at zero.  At this point bad stuff happens

Answer,  a surge protector like Surge-X that clamps the hot and neutral together. 
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John Roberts {JR}

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Re: 2 volts too much?
« Reply #21 on: December 14, 2017, 09:22:43 am »

while we are all thinking about voltage drop on the neutral, vs the ground think about what happens when a surge protector does its thing.  A giant surge hits the AC feed to the booth.  The surge protector connects that crazy high voltage on both hot and neutral to ground.
High voltage on Neutral?
Quote
Current flows through the ground developing a voltage.  Let's say 100 volts for just an instant. No problem.  The equipment has been saved.

But. There is a audio cable from the mixer in the booth to the amp on the platform.  Now the amp that didn't get a surge sees 100 volts coming down pin one.  It's own ground is (or was) at zero.  At this point bad stuff happens
pin one "should" be bonded to chassis ground and safety ground...So no problemo.
Quote
Answer,  a surge protector like Surge-X that clamps the hot and neutral together.
Safety ground is supposed to be the ultimate sewer for fault currents. 

Clamping line to neutral seems OK, while it could cause neutral to rise significantly wrt ground, but neutral is floating inside products so no problemo.

JR
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