By Thibault Margaux. Electrical Wiring. Publised at Thursday, January 18th 2018, 15:49:48 PM. The National Electrical Code (NEC) dictates that no wiring splices are allowed outside of an approved enclosure. One type of approved enclosure is a junction box. A junction box is simply a standard electrical box that is mounted securely (to house framing or another structure) and contains the splice—the wiring connection—of two or more circuit cables or wires. The cables are secured to the box with cable clamps (or conduit connectors, if the circuit includes conduit), and it must have a removable cover to create a complete enclosure. Junction box covers must remain accessible; they cannot be covered with drywall or other surface material.
By Elvire Fernande. Electrical Wiring. Published at Tuesday, November 07th 2017, 13:17:40 PM. The NEC is used in conjunction with local, country, and State codes that strictly control electrical wiring. The codes are concerned with proper size of wire and with insulation. Factors that are considered are the expected load, the frequency of modifications, and the nature of the environment where the wire is used. Homes have small loads, infrequent modifications and a very non-corrosive environment. Commercial establishments are usually in the middle. The load demands are sometimes higher, and modifications are not infrequent. The factory or industrial site has a very high demand. Modifications are frequent, and the environment is often highly unstable.
By Thibault Margaux. Engine Wiring. Published at Monday, November 06th 2017, 10:52:58 AM. That is not to say that things will stay as they are now. The engine is undergoing a significant evolution of its own, as new fuel economy and emissions standards in the light-duty and heavy-duty sectors push the development of new technologies on an unprecedented scale toward the theoretical limits of engine operation. Coupled with continuing research into fundamental engine processes, the introduction of affordable high-performance computing, and the adoption of advanced manufacturing techniques throughout industry, those new technologies are leading to potentially disruptive opportunities for the introduction of engines with extraordinarily high efficiencies. How these new engines perform and how they will be integrated into new vehicle architectures will be the story of personal mobility for this half of the 21st century.
By Elvire Fernande. Electrical Wiring. Published at Sunday, November 05th 2017, 09:05:30 AM. Materials used in wire have varied over the years. Copper has always been the first choice because it is such a good conductor and is very flexible. In the 1960 to 1970’s, aluminum wire became popular due to the rising cost of copper. Insulation was usually rubber although rubber tended to corrode due to exposure to moisture and air. PVC compounds are now used most commonly as wire insulation. Insulation is made in different colors to identify wiring circuits in a system.
By Elvire Fernande. Engine Wiring. Published at Wednesday, November 01st 2017, 07:35:05 AM. The push toward higher-efficiency engines will alter exhaust temperatures and chemistry and may create challenges for emission control technologies. For example, new higher-efficiency engines will have lower exhaust temperatures, due to more efficient work extraction at the piston. Lower exhaust temperatures will, in turn, require the development of new emission control technologies, which must not only be effective at low temperatures but also must survive high exhaust temperatures encountered under high load conditions.
By Thibault Margaux. Engine Wiring. Published at Monday, October 30th 2017, 18:41:31 PM. Most folks think that in the world of mechanized movement, steam-powered external combustion engines came before the internal combustion variety. The reality is that the internal combustion engine came first. "Yes, the ancient Greeks messed around with steam-powered engines, but nothing practical came from their experiments".
By Faustine Arnaud. Electrical Wiring. Published at Friday, October 27th 2017, 16:08:15 PM. The long thick cables of transmission lines are made of copper or aluminum because theyhave a low resistance.
By Marthe Mathilde. Engine Wiring. Published at Monday, October 23rd 2017, 10:50:45 AM. This type of system is used by a number of suppliers, most commonly in Europe, but hasn't yet come to the market in many areas of the world. Laboe says the amount of increase in fuel economy demonstrated is significant. This technology is coming to meet upcoming regulatory obligations, and Chrysler is interested in this approach because it benefits fuel economy using available energy, and, most importantly, can be incorporated into existing powertrain architectures.
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