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Heat cannot escape the duct as easily as in open air. This results in the same amount of current causing the cable to heat to a higher temperature.

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Q: Why is it necessary to derate cables when installed in a duct?
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Related questions

How do you protect cable from animals?

There are a few ways to protect cables from animals. One way is to cover the cables with duct tape.


Why doesn't your apartment have duct work?

If your apartment does not have duct work, the owner of the building has not had it installed. Perhaps they felt it would be too costly to install, or perhaps they are simply not interested in or see a need for duct work.


Where is the IAT sensor on 1993 Nissan Maxima?

The IAT sensor is installed in the intake air duct


When one performs cable jetting what is one doing?

When one performs cable jetting, it usually refers to someone is setting up the cables. The cable jetting is a method, where the cables are pushed into a duct.


What is the root word in deduction?

The root word is duct (a tube in a building, usually for ventilation, water pipes and electrical cables, etc).


Where is the intake-air-temp sensor on a 1997 Nissan Maxima?

The IAT sensor is installed in the intake air duct


It is possible to get a central air conditioner installed in my 1900 victorian home?

Of course it is. The unfortunate part is that because it is so historic, you will have to new duct work installed, which will cost you a lot of money.


Is there a special kind of duct work needed when installing a new furnace, when using an I-beam for the floor joist Does the steel I-beam have anything to do w/what kind of duct work is installed?

The duct work does not need to be different from the rest just because of the I beam. Just be sure there is room so you do not compress it.


What kind of equipment is necessary for air duct cleaning?

Air duct cleaning simply requires a screwdriver, heavy-duty gloves, a cleaning brush, rags, and a vacuum cleaner, though hiring a professional is recommended in order to avoid damage to the air duct.


What the uses of bus duct?

Busduct is useful for transforming current from switchgear end to transformer end.It has no voltage drop.But little bit expensive when compared to Cables.


Can you use duct tape instead of gaffer tape for securing cables to a floor?

Yes you could bt I wouldn't reccommend it because it will leave stickies on the floor.


What is difference between pre tension and post tension precast girders of bridge?

A simple explanation: PRE tensioned- cables are tensioned, and the concrete is cast around it. The tensioning is done BEFORE casting the concrete (PRE = before). POST tensioned- cables are placed inside of ducts or are greased to prevent bonding to the concrete, the concrete is cast around the cables, and then the cables are tensioned after the concrete has reached a desired strength. The tensioning is done AFTER the concrete is cast (POST = after).