What was the outcome of the Pentagon Papers case?
On June 30, 1971, in what is regarded as one of the most significant prior-restraint cases in history, the U.S. Supreme Court in a 6–3 decision freed the newspapers to resume publishing the material. The court held that the government had failed to justify restraint of publication.
Which newspaper headed Benjamin Franklin and often?
In 1729, Benjamin Franklin bought a newspaper, the Pennsylvania Gazette. Franklin not only printed the paper, but often contributed pieces to the paper under aliases. His newspaper soon became the most successful in the colonies.
Why did Benjamin Franklin decide to let his family run the printing business?
Answer: What Benjamin really wanted was to go to sea. He was an excellent swimmer, loved the ocean, and dreamed of working on a ship, but an older brother had died at sea so his father would not allow it. When another brother, James, returned from England to set up a printing business, their father knew what to do.
What was the name of Benjamin Franklin’s paper?
Pennsylvania Gazette the best newspaper
How did lightning rods change communities?
The pointed lightning rod placed on the State House and other buildings became a symbol of the ingenuity and independence of a young, thriving nation, as well as the intellect and inventiveness of Benjamin Franklin.
What is the purpose of a lightning rod?
Lightning rods (and the accompanying protection system) are designed to protect a house or building from a direct lightning strike and, in particular, a lightning-initiated fire.
What happens when lightning hits a lightning rod?
If lightning hits the structure, it will preferentially strike the rod and be conducted to ground through a wire, instead of passing through the structure, where it could start a fire or cause electrocution. Lightning rods are also called finials, air terminals, or strike termination devices.
Can I install a lightning rod on my house?
If you live in a very tall home, have trees taller than your home less than 10 feet away from its structure, or live in an area with a high lightning strikes, however, installing a lightning rod is recommended.
Do electricians install lightning rods?
Lightning protection is not a do-it-yourself project. Only experienced and reputable LPI-certified lightning protection contractors should install lightning protection systems. Design and installation is typically not within the scope of expertise held by homeowners, electricians, general contractors or roofers.
How much does it cost to install a ground rod?
8′ ground rods cost about $11 apiece – 10′ if required in your area about $15 each. The grounding wire, assuming #4 bare copper wire, about $1.20/LF, 4 clamps at $5 ea – so assuming about 10′ run to each rod, then about $66-74 materials – say maybe $80-90 with markup.
Can you touch a ground rod?
Yes, it’s not dangerous at all, it’s the same as touching the ground.
How far does a grounding rod need to be in the ground?
eight feet
How far should a ground rod be buried?
You need to drive your rod all the way into the ground. The electrical code states that it must have 8 feet (2.4 m) of contact with the ground, so you need to drive it all the way down.
Can you use rebar as a grounding rod?
Proper Grounding Rod In most cases, pipe or rebar can be used. The grounding rod needs to be made of galvanized steel and also needs to be at least four feet in length for best results.
How do we call the connection of ground wire to the ground rod?
Grounding clamps are used to connect the grounding electrode conductor to the ground rod. An acorn clamp is an oval-shaped clamp with a bolt used to tighten it to the ground rod.
Why are 2 ground rods required?
Suppose you drive the first ground rod for a system. If it has a ground resistance of 25 ohms or more, 250.56 of the 2005 NEC requires you to drive a second rod. Ground rods spaced less than two rod-lengths apart will interfere with each other because their effective resistance areas will overlap (Fig. 2a above).
Are ground rods necessary?
A fundamental component of safety and protection for your business and/or home’s electrical system is proper grounding. For this reason, one or more ground rods are required on your property by the National Electrical Code (NEC) and local building codes.
Can a ground rod be inside building?
Senior Member. Brian Stoin said: I have seen and even installed ground rods inside buildings on many occasions. Some electrical rooms in commercial buildings make it impractical to run an electrode outside.
What is the maximum angle that you may drive a ground rod?
It shall be driven to a depth of not less than 8 ft except that, where rock bottom is encountered, the electrode shall be driven at an oblique angle not to exceed 45 degrees from the vertical or, where rock bottom is encountered at an angle up to 45 degrees, the electrode shall be permitted to be buried in a trench …