• What is the proper way to test Ohms on a grounding electrode system using a ground rod?

    What is the proper way to test Ohms on a grounding electrode system using a ground rod? NEC sec 250.53, grounding electrodes using a ground rod requires 25 Ohms or less, and a secondary ground rod is required if the Ohms are greater than 25. What is the correct way to test the Ohms? At the ground rod itself by using an ohmmeter with one lead on... show more
    What is the proper way to test Ohms on a grounding electrode system using a ground rod? NEC sec 250.53, grounding electrodes using a ground rod requires 25 Ohms or less, and a secondary ground rod is required if the Ohms are greater than 25. What is the correct way to test the Ohms? At the ground rod itself by using an ohmmeter with one lead on the ground rod and one lead on the bare copper connected to the main disconnect? What if the main disconnect is located on the opposite side of the building. Would you test Ohms at the main disconnect with one lead on the bare copper going to the ground rod and one lead on the main disconnect grounding lug? Or would you still test at the ground rod location? Thank you
    1 answer · Engineering · 5 years ago
  • Question about stars light, speed of light and optics?

    Basically, i'm not quite convinced the star light in the sky is from the death of stars that has long pass away billions of years ago. I have created a list of axioms that should help narrow down my cosmic dilemma. Axiom 1) Because of the vastness of the cosmos, one should be able to witness the formation of starlight and likewise the... show more
    Basically, i'm not quite convinced the star light in the sky is from the death of stars that has long pass away billions of years ago. I have created a list of axioms that should help narrow down my cosmic dilemma. Axiom 1) Because of the vastness of the cosmos, one should be able to witness the formation of starlight and likewise the deformation of starlight. This formation and deformation should be visible by the naked eye on a dark night at all times. Axiom 2) Because there is no formation and deformation of star light in the sky at a rate which would be noticed by the human eye on a dark night, the following assumptions apply: Most favored assumption: A) The rate is a lot slower and/or not noticed by the naked eye. Least favored assumption: B) There is no new star light created. As I am leaning toward axiom 1 I am still quite puzzled. Please help me understand this a little better.
    9 answers · Astronomy & Space · 5 years ago
  • Electrical Engineering and N.E.C. Question About Showers and Outlets/Receptacles?

    I have a question about a ADA compliant shower where the home owner uses a wheelchair to enter the bathroom. The bathroom and shower are not separated by a curb or shower door. Rather the whole bathroom is a shower/bathroom. N.E.C. states receptacles cannot be in a shower. Switches are not allowed unless they are assembled with the shower. My... show more
    I have a question about a ADA compliant shower where the home owner uses a wheelchair to enter the bathroom. The bathroom and shower are not separated by a curb or shower door. Rather the whole bathroom is a shower/bathroom. N.E.C. states receptacles cannot be in a shower. Switches are not allowed unless they are assembled with the shower. My question: does the vanity which has outlets and receptacles fall within the shower? It is this a common problem with ADA home owners? Is there a exception for ADA home owners? Thank you. Additional notes: The drain of the shower is not a traditional center drain but is a elongated drain near the edge. So the pre-slope is toward the edge if that helps.
    1 answer · Engineering · 6 years ago
  • Engineers... Question about Transformers?

    Hi, thanks for reading my question. I'm an electrician with some basic knowledge of electricity but this is puzzling me. In the USA, a single transformer on a pole means split phase. Three transformers on a pole means 3 phase. What does two transformers mean? Is it split phase with a high leg? Thanks
    Hi, thanks for reading my question. I'm an electrician with some basic knowledge of electricity but this is puzzling me. In the USA, a single transformer on a pole means split phase. Three transformers on a pole means 3 phase. What does two transformers mean? Is it split phase with a high leg? Thanks
    3 answers · Engineering · 6 years ago
  • Questions regarding magnets?

    If a magnet is placed in a vacuum such as space will it retain its magnetic properties? How long will a magnet retain its magnet properties? Does a magnet accelerate differently when falling on earth as opposed to a non magnetic body? Thank you
    If a magnet is placed in a vacuum such as space will it retain its magnetic properties? How long will a magnet retain its magnet properties? Does a magnet accelerate differently when falling on earth as opposed to a non magnetic body? Thank you
    3 answers · Physics · 6 years ago
  • Shower Liner Question?

    Recently I put in my shower liner and I've filled it with water to test for leaks. So far no leaks but I've got crinkles in the linear. Is it okay to leave them or should I remove them and how?
    Recently I put in my shower liner and I've filled it with water to test for leaks. So far no leaks but I've got crinkles in the linear. Is it okay to leave them or should I remove them and how?
    1 answer · Do It Yourself (DIY) · 7 years ago
  • Why do cosmologist always forget to say "we don't know"?

    Sure they can tell you the origin of life, the universe and everything that exist. A big bang, no maybe a black hole, or no maybe a singularity. Do they honestly think there mathematical theories will ever make sense or perhaps their ego is just a bit too flamboyant to admit they just don't know where the uviverse began.
    Sure they can tell you the origin of life, the universe and everything that exist. A big bang, no maybe a black hole, or no maybe a singularity. Do they honestly think there mathematical theories will ever make sense or perhaps their ego is just a bit too flamboyant to admit they just don't know where the uviverse began.
    9 answers · Astronomy & Space · 9 years ago
  • How to remedy the singing effect dimming lights produce?

    I have about 12 75 watt halogen lights on 1000 watt dimmer and any time I dim them some of the lights will "sing". Anybody who has had a similar situation and knows a good remedy?
    I have about 12 75 watt halogen lights on 1000 watt dimmer and any time I dim them some of the lights will "sing". Anybody who has had a similar situation and knows a good remedy?
    4 answers · Maintenance & Repairs · 1 decade ago
  • Should I plead guilty, no contest, or not guilty?

    I was in a car accident about 2 weeks ago, Gwinnett County, Georgia. The court will be held at a state court as I was not in any particular city limits. The police officer cited me a ticket for failing to yield while turning left. The thing is, I had a "turning arrow" and was more than half way through the intersection. The other... show more
    I was in a car accident about 2 weeks ago, Gwinnett County, Georgia. The court will be held at a state court as I was not in any particular city limits. The police officer cited me a ticket for failing to yield while turning left. The thing is, I had a "turning arrow" and was more than half way through the intersection. The other driver who obviously had a red light, ploughed into me at high speeds, and he had no intentions of slowing down. I've spoke with a different officer about the matter and he said I should plead not guilty. And if the court still disagrees with me I should plead no contest. I also have my g/f as a witness as she was with during the accident. Nobody was harmed thankfully and the other driver was very nice. He even admitted in front of me and my girlfriend that he could not remember if the light was green or red. Any advice and or suggestions will be greatly appreciated. Thanks, Kris
    10 answers · Law & Ethics · 1 decade ago