Is a device that interrupts and de energizes an electrical circuit to protect a person from electrocution?
Basic Safety
| A | B |
|---|---|
| Foot-candle | A unit of measure of the intensity of light falling on a surface |
| Ground | The conducting connection between electrical equipment and the earth |
| GFCI | Ground fault circuit interrupter |
| Ground fault circuit interrupter | device that interrupts and de-energizes to protect fro electrocution |
What is the waste material from welding operations?
Welding slag is a form of slag, or vitreous material produced as a byproduct of some arc welding processes, most specifically shielded metal arc welding (also known as stick welding), submerged arc welding, and flux-cored arc welding.
What does overloading a ladder mean?
When climbing a ladder or scaffold, a tag line or blank should be used to pull up tools. Overloading, which means exceeding the blank of a ladder, can cause ladder failure.
What prevents trench walls from collapsing?
Another way to reduce the pressure put on trench walls is to use a sloping or benching system. Sloped Walls – A 34-degree slope should be used when digging to prevent a section near the top from giving out and burying the bottom of the trench.
What is Trench Collapse?
A trench collapses when its walls fail to contain the pressure of the tones of soil pressing on it. Even though this can be problematic in any depth, it can accelerate if other materials are piled at the edge.
How deep can you legally dig?
However, for practical purposes (leaving the legal requirements aside), it is generally safe to dig holes no more than 300mm deep (12 inches) on your property, and it’s much safer and non-risky to dig holes no more than 100mm deep (4 inches).
At what depth is a trench considered a confined space?
four feet
What classifies a confined space?
What are confined spaces? A confined space also has limited or restricted means for entry or exit and is not designed for continuous occupancy. Confined spaces include, but are not limited to, tanks, vessels, silos, storage bins, hoppers, vaults, pits, manholes, tunnels, equipment housings, ductwork, pipelines, etc.
What is the difference between a trench and an excavation?
What is the difference between an excavation and a trench? OSHA defines an excavation as any man-made cut, cavity, trench, or depression in the Earth’s surface formed by earth removal. A trench is defined as a narrow excavation (in relation to its length) made below the surface of the ground.
Is a trench a hole?
A trench is a deep and narrow hole, or ditch, in the ground, like the kind soldiers on frontlines might dig to give themselves shelter from the enemy. A natural trench may also be a deep hole on the bottom of the ocean.
Why are trenches dangerous?
Life in the trenches was dangerous for many reasons. The more obvious dangers included enemy fire, poisonous gas attacks and artillery shelling. While the trenches offered general protection from enemy fire and artillery shelling, they could also be extremely dangerous places.
What are the types of shoring?
Types of shoring
- Raking shoring.
- Flying shoring.
- Dead shoring.
What is the difference between shoring and shielding?
Shoring should not be confused with shielding by means of trench shields. Shoring is designed to prevent collapse, whilst shielding is only designed to protect workers should collapse occur. Most professionals agree that shoring is the safer approach of the two.
What is meant by shoring?
Shoring is the process of temporarily supporting a building, vessel, structure, or trench with shores (props) when in danger of collapse or during repairs or alterations. Shoring comes from shore, a timber or metal prop. Shoring may be vertical, angled, or horizontal.
What is a shoring box?
It is a two sided support system used in a mechanical excavation. A trench box is an important shoring equipment which is a boon for excavators. It helps to increase job safety as well as productivity. Workers use them while they pour the foundations. Trench boxes are extremely important for the construction industry.
What is shielding in construction?
Shielding is used in buildings to protect people and equipment from the effects of other nearby items. Shielding can be used to protect the contents of a room or object (prevent something from getting in) or it can be used to protect everything outside a room (prevent something from getting out). ……
What is a trench box in construction?
Trench boxes, also called trench shields or trench sheets, are one type of protective system. They aren’t designed to shore or prevent a trench wall from collapsing. Instead, they’re designed to protect workers from the pressure and weight of soil in the event of a cave-in….
How much does it cost to rent a trench box?
A trench shield 8 ft high and 24 ft in length might rent for $1,500 a month, according to Ross, a small repair box for $200 a day. This is pretty incidental overhead for a project budget of any appreciable size….