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- How does one choose the lightning protection class for risk assessment calculation, and how do you calculate radius of striking sphere & lightining current?
- What is omni potential grounding?
- How can you calculate the resistance-to-ground for a ground ring with rods attached?
- Can you explain the 1/20 probe depth rule when conducting a Wenner 4-pin Soil Resistivity Test?
- What is the best probe spacing’s for soil resistivity testing?
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Category Archives: Electrical Standards
I have ab phase grounded system tied into an existing ground grid. I am installing a new delta- wye solidly grounded transformer. Should the ground loops be tied together? is that safe? Isnt there 480V referenced to another ground form the B phase grounded transformer?
Hi Mike, Thank you for your question regarding ground systems for different voltage transformers, it is our pleasure to help. Yes, the grounding systems not only should be bonded together, but they must be bonded together under the National Electrical … Continue reading
What is the proper grounding methodology for cellular station?
Hi Shachidevi, Thank you for your question regarding proper grounding at cellular stations, it is our pleasure to help. Proper grounding at cellular stations is quite complex and detailed. There are many requirements for extensive bonding and a typical cellular … Continue reading
When installing a new satellite Internet and TV service in a home, they often do not have an adequate ground within 20 ft per NEC 810 and 820. What can I do?
Hi Kevin, Thank you for your question regarding the 20-ft grounding rule for cable antenna grounding, it is our pleasure to help. There are really no special rules or exceptions for cable and antenna grounding in the National Electrical Code … Continue reading
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Can insulated copper conductor be used for a ground grid?
Sourav tells us that: Our Client is asking for an insulated copper conductor for the ground grid at a depth of 2’ from the grade level instead of bare copper due to corrosion issues. We are trying to model and … Continue reading
We are in the construction phase of building a data center. we are gfacing an issue with the grounding inside the computer room. thie issue is basically is whether to use spearate ground buses for power (PDUs, power panels) equipment and communication equipment? these buses are connected to one common ground grid.
Hi Fahad, Thank you for your question regarding computer room grounding, it is our pleasure to help. There are often many questions regarding the various grounding and bonding systems found within a computer data center, and this mostly has to … Continue reading
NEC now requires GFCI’s on refrigerators. Is there really a technical reason to put a GFCI on a refrigerator?
Hi Max, Thank you for your question regarding Ground-Fault Circuit-Interrupter (GFCI) protection for personnel and refrigerator receptacle outlets, it is our pleasure to help. Refrigerators, surge-protection devices, electric motors, and many other devices have reported problems of excessively tripping the … Continue reading
I am designing a ground ring for an industrial facility. We typically require the ground ring to be 5’ from the building, but I can not find anything in the NEC for a building distance requirement. Do you know if there is such a requirement and if so, how far?
Hi Sherry, Thank you for your question regarding ground rings and required distances, it is our pleasure to help. You are correct that the 2011 National Electrical Code (NEC) does not have a required distance that a ground ring must … Continue reading
What is the type of earthing at shore side electrical equipment, also please tell us the standard followed
Hi Shailesh, Thank you for your question regarding the grounding requirements along shorelines, it is our pleasure to help. Grounding along the coast near the ocean is no different than any other grounding. You should follow all the same rules … Continue reading
I am trying to run a propane furnace with a 3000 watt generator during a power outage. The furnace is run on a 15 amp circuit. I know that this size generator will run the furnace. More often that not a fault code is tripped in the furnace that says reverse polarity. The generator will run lights and refrigerator OK. Does the generator need to be grounded?
Hi Joanie, Please be advised that you need to contact a Certified Electrician ASAP! Thank you for your question regarding your generator and furnace, it is our pleasure to help. Yes, your generator must be grounded; it is required under … Continue reading
In substation, often LV and HV, grounds and neutral of transformer or other instrument are connecting to one meshy network. Sometimes when lightening or other phenomenona like that occurs the LV instruments are destroyed. How can I resolve this problem and how can I know about the new method for grounding in substation? LV and HV, grounds and neutral should be connecting to one ground grid or no? is it any standard for connecting or separating grounds in substation?
Hi Moshen, Thank you for your question regarding LV and HV grounding at substations, it is our pleasure to help. You may not have separate grounding systems at any location, particularly at substations. It would be very hazardous and would … Continue reading