Do you need a grounding point for an isolation transformer?
Then I need to float the scope chassis from ground. If earth ground voltages/currents are a problem to this equipment, then at a minimum you may want a normal 1 to 1 transformer and on the secondary tie one line to a grounding point relative to the equipment’s signal input.
Can a secondary transformer be hooked up without grounding?
If the secondary voltage is one that is required to be grounded by 250.20, then there is no code compliant way to hook-up the transformer without a connection between the primary and secondary EGCs (with some rare exceptions, for example the isolated systems permitted in Article 517).
What happens if the isolation transformer is outside a screen?
If the isolation transformer is just outside a screen room the transformer shield might connect to the incoming EGC, and the secondary might connect to the screen room shield. What needs to be done depends upon the problem.
How does an isolation transformer reduce common mode noise?
As I previously said an isolation transformer primarily reduces incoming common mode noise. Other noise passes right thru the transformer. Connecting the secondary to the incoming EGC does nothing to solve EGC path noise problems for interconnected equipment on each side of the transformer.
Can You rebond neutral to Earth in isolation transformer?
This may, or may not be a problem for your electrical equipment. You could just rebond the neutral to earth again, but electrical codes do not allow for this. However since the secondary is isolated from the primary you can safely derive a new neutral and earth by bonding these together at the secondary of the isolation transformer.
Why is the secondary of the isolation transformer isolated?
However since the secondary is isolated from the primary you can safely derive a new neutral and earth by bonding these together at the secondary of the isolation transformer. This is also done to eliminate noise between “neutral” and earth – as you are shorting it out. There is a safety concern when doing this however.
How big is an isolation transformer for building steel?
Doesn’t seem like grounding to building steel would apply for this application. This isolation transformer is about the size of a shoe box, will be plugged into a receptacle and will be sitting on the floor near the equipment to be protected. Any advice will be greatly appreciated. What is the sensitive electronic equipment?