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Q: What depth below ceiling require smoke detector as per NFPA?
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What depth above ceiling require smoke detector as per NFPA?

more than 80 cm


Can a metal detector detect concrete?

Sure if there is enough metal like steel rebar


Can can lights be installed in ceiling of kitchen below upper floor?

Yes, if the upper floor joists are deep enough to install the pot light enclosures. Measure the depth of the joists and then take that measurement to the store supplying the fixtures to see what will fit into that joist depth.


Up to what depth can a Bounty Hunter BHJS Junior Metal Detector indicate the presence of a metal object?

The depth a Bounty Hunter BHJS Junior Metal Detector can indicate presence of metal is similar to that of a professional metal detector. It can find coins up to 5 inches deep and some larger objects up to 3 feet deep.


Do Manganese nodules do not accumulate below 4500 meters depth because the manganese minerals are highly soluble in seawater below that depth?

Manganese nodules do not accumulate below 4500 meters depth because the manganese minerals are highly soluble in seawater below that depth.


How does temperature change with depth below earths surface?

temperature increases with depth


What is the apparent depth of an object whose real depth below the water surface is 5 m?

its apparent depth is 1.5m.


What describes how temperature and pressure change with depth below Earth's surface?

Both temperature and pressure increase with depth.


What metals can not be detected by a metal detector?

Technically speaking it can detect through anything, however the depth at which it can detect will be effected by various factors such as density, moisture and more importantly base metals present in the sand and soil layer. One of the biggest factors is metal density and variety in the soil layer. An area rich in a variety of metals will require a detector with excellent discrimination in order to decipher specific target metals or there will be too much background metal to find a specific object. Basically it comes down the quality of the detector, the depth it can penetrate and the level of discrimination that it can be set to that will allow it to pick out specific metal combinations. A poor quality detector will get confused and go off constantly if there is a high volume of metals in the soil composition and if it lacks the ability to tune out the "background" noise of those metals.


At what depth does OSHA start to require shoring for trenches?

Six feet


What is the depth below the surface in cm for the crust?

On the Earth's surface, the depth is between 8-64 kilometers.


What is the draft of a ship?

It is the depth of the hull below the waterline.