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How to MAKE a STRUCTURAL GROUND (using FOUNDATION HARDWARE)
Welcome everyone to the first and certainly the most complete class on structural grounding in practice ever shown on KZfaq! It's crazy, Engehall is raising the bar a lot with classes like this! Ready to leave a like!
In today's class you will learn:
- Details of the foundation of this house + lashings between hardware.
- How to do the continuity tests using the milliohmmeter and the microhmmeter.
- How to install the REBAR step by step (galvanized rod that is attached to the hardware inside the concrete)
- Frequently asked questions about structural grounding
This property has a foundation made of drill piles, these are more than 9 meters deep, and logically we will have baldrame beams scattered throughout the area. Altogether there are 54 drill stakes that have already been drilled, the hardware inserted and it has also been concreted.
This structure will be completely interconnected to the baldrame beams that together add up to more than 500 linear meters of ironwork into the concrete and logically in contact with the earth. This tends to give us very low ground resistance. Here we are following the process of tying the structures, which is done with annealed wire, everything needs to be checked visually first, if the hardware is interconnected so that then you can run the continuity test on the hardware.
Here comes my first question from today's class:
Which grounding do you think is better, sticking 3 rods close to the standard or QDC and interconnecting to the neutral making a BEP, or using all the hardware in the house as grounding electrodes and interconnecting everything in a BEP? We'll find that out shortly.
And to carry out this service and give this great personal lesson, I invited a comrade that I admire a lot for his professionalism and the person that he is, LEONARDO LETECH, a long-term partner who made a point of coming along with EDUARDO, aka DUDU, his faithful squire to help us help with structure continuity measurements and other procedures.
And to prove this resistance value, Leo even measured it with another top tool in his arsenal, the microhmmeter…
We also simulated another didactic test to show the device accusing the lack of continuity, look how cool!
For this work in particular, we chose to use the system known as "REBAR", which are these fire-galvanized round rebars, 8mm thick and 4 m long.
To fix them to the hardware, we use U-type clamps according to the thickness of both. The service is very simple and does not require much technical knowledge. Remembering that we doubled our REBAR at this point, because it will be exactly on this wall that we will install the QGBT of this work, for this reason our structural grounding will connect directly to the BEP of this frame.
And finally, give concrete!
As this work is close to my personal home, I can follow the evolution on a weekly basis.
I made a point of coming to accompany the 30 cubic meters of concrete that this foundation took.
It's a joke, but the 54 drill piles had already taken 75 cubic meters of concrete. So far, 50 thousand reais have been spent on concrete and another 40 thousand on hardware. Therefore, the standard recommends using the structure of the house itself to make the grounding system. And so, only the rod of our REBAR is left out to be dropped inside the QDC, nice, isn't it?
Doubt 1: André, to do a grounding like this, every time I will need the millimeter or micrometer to measure the continuity beforehand or just doing a visual inspection if everything is interconnected, can I ground it now?
The standard only recommends that the connection be durable and continuous, that is, that everything is interconnected!
Unfortunately, only with a multimeter you cannot do the continuity test because of the distance between the points of this mesh. To do this just with a milli or with the microhmmeter.
However, if you do a visual inspection and on your own want to ensure that everything is interconnected, it is your responsibility, the standard does not say anything about mandatory use of the mentioned equipment.
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