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What Does a Ground Rod Do?
by quickspark - 01/26/21 12:38 AM
Floating Ground - device being tested or scope?
by quickspark - 01/26/21 12:36 AM
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Re: What Does a Ground Rod Do? quickspark Yesterday at 05:38 AM
The ground road is located usually close to the main electrical switch. It is either made of copper or copper-coated steel with 8 to 10 feet in height.

The installation is done to the main panel that supplies electricity with an approved ground connection. One ground road can take the load of 25ohms resistance or less. If above 25ohms, it is necessary to have an additional ground rod for overall supply as well as support.

The primary objective of a ground rod is to protect against a power surge. Among the various situations that occur on your electrical system, the most common are high voltage surges, and damage or loss of the Service Conductors.

High voltage surges are often caused by lightning strikes on or near power lines. Besides, the voltage failure can occur when large appliances or heavy machinery at nearby locations are frequently switched on or off. Proper grounding provides stability to your home’s electrical system and reduces the impact of such power surges.

Call your nearest electrical installation service to help you install and suggest the ground rod to protect your residential space from sudden electrical issues.
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Electrical Theory and Applications Jump to new posts
Re: Floating Ground - device being tested or scope? quickspark Yesterday at 05:36 AM
The most preferred scope is to connect normally. Floating the scope is the last thing you would want as an alternative.
You are potentially putting line voltage on the case of the scope and bad things can start happening very quickly, this could impose a risk of life too.

We suggest you look at the wiring diagram and decide where the grounded conductor is and ground the scope at that point. The small amount of ripple you see will not affect your measurement. It is tied to the ground via an external plug.

If you are looking at something on the load side of a transformer you should be able to ground the scope normally. You can ground the scope to the circuit through a light bulb, voltage wise. If it sparks, you are going to have to reconsider your plan of action.

Be sure you have the right ground clips if you are looking at line voltage.
It is best to learn your scope technique with a transformer isolated circuit, preferably at low voltages, like a doorbell transformer or a wall wart.
Electrical companies Australia can provide the necessary advise based on the requirement and concern with the floating ground.

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