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Junction boxes are metal or plastic enclosures used as housings for wiring connections. The connections within are called branch circuits and usually represent the end of a conduit run. Junction boxes make wire access easy, since all one must do is remove the covering to make alterations, repairs, or additions to a conduit. Junction boxes also protect wiring from the elements or environment, which can sometimes be corrosive or otherwise harmful to wiring material. Finally, junction boxes protect wiring from unwanted tampering, whether malicious or unintentional.
Junction Box Wiring Basics
Essentially, a junction box houses wire connections in order to split off power from a single source to multiple outlets. For instance, a junction box might contain one wire power source that is connected through multiple wires to power several different lights.
Electrical junction boxes are usually between 2 ½ to 3 ½ inches long and made of metal or hard plastic. The functional difference between plastic and metal depends whether or not the junction box is supposed to support any weight. Some metal junction boxes can support light fixtures; plastic junction boxes cannot withstand this weight. Additional differences include installation, in that plastic IP65 junction boxes are typically quicker and easier to install than metal ones. However, a standard junction box designed to simple cover wire splices can be either metal or plastic.
Wire Splices in Junction Boxes
All wire splices must be contained within a junction box for a building to meet electric code, although sometimes splices are missed and may present hazards as a result. Any exposed wiring can be dangerous, but exposed wire splices are especially prone to accident because they can be tripped over, expel sparks or misrepresent themselves be misperceived as playthings by children or pets. Junction boxes are helpful for wire splices because they also allow one to easily locate the wire splice area.
Waterproof junction boxes provide an important function of providing a safe transition of power produced from the photovoltaic (PV) cells in the laminate to the external wiring system for interconnecting modules and loads. Electric distribution boxes, also referred to as “jboxes,” are used in a wide variety of electrical applications and serve to protect the connections between wires and cables. In a PV module, however, the jbox also houses the bypass diode that provides a PV cell-protective function and it is prewired and terminated for rapid interconnection of modules in the field. The junction box enclosure consists of a body enclosure and lid both of which are almost exclusively made of injection-molded polymeric construction and are adhered to the substrate of the module with an adhesive compatible with both the junction box polymer and PV module substrate.
The combination of the enclosure, bypass diode, transitioning wiring, connectors, and adhesive makes the jbox a complex component that appears deceptively simple and is not designed to be maintained or serviced. This combination of system behavior and lack of maintainability poses a reliability challenge for the PV module manufacturer, where a service lifetime of 25-years is expected. The importance of design, characterization of the failure and degradation modes, sufficient qualification and durability testing, and manufacturing quality control for the Jbox system (box and connectors) cannot be overestimated since failures of this system account for approximately 18% of 180 fire incidents studied from 1995 to 2012. This study indicates that the jbox with its associated PV connector was the number one cause for a fire, with the second being inverters at 16%. The International Energy Agency’s 2014 report suggests that PV connectors alone may be responsible for up to one-third of PV module fire incidents suggesting that special attention to this component is required.
A junction box is an electrical enclosure that protects electrical conductors at the points where they are spliced, tapped and pulled. These enclosures allow electricians to easily access the conductors to perform work when needed while simultaneously keeping the conductors safe from damage and unauthorized access.
Sometimes, you’ll hear the term “junction box” used to refer to an electrical fixture box. In the true technical definition of a distribution box, wires should connect only to other wires and raceways. However, in practice, the term is also frequently used to refer to many other electrical box types in which wires connect to a fixture such as a ceiling fan, light switch or wall socket.
Sizing a junction box is critical for making sure the junction box functions correctly. In a junction box that’s too small, an electrician may have to bend conductors excessively to fit them fully inside the box, which risks damaging the insulation on the wires. Conductors and other components spaced too closely may also create interference or hazardous conditions.
Article 314 of the National Electrical Code contains most of the key regulations that you’ll need to follow when choosing and installing a junction box. These regulations describe in detail the required junction box size, depending on the number and size of conductors and fittings enclosed within the box.
You’ll need to calculate both box volume and box fill when determining the appropriate size for a power distribution box. What do these concepts mean?
Box volume is the total enclosed volume of the junction box, including any extended space provided by attachments such as domed covers or extension rings.
Box fill is the total space occupied by the components that will be contained within the junction box with electric breaker.
The box volume should always be greater than or equal to the box fill. To calculate box volume and box fill, you’ll need the tables from NEC 314.16 and knowledge of how to use them. Next, we’ll look at how to use these important tools.
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Topics and categories on The BidAmount Asian Art Forum | Chinese Art
Kangxi vases, Kangxi dishes and chargers, Kangxi ritual pieces, Kangxi scholar's objects, Qianlong famille rose, Qianlong enamels, Qianlong period paintings, Qianlong Emporer's court, Fine porcelain of the Yongzheng period. Chinese imperial art, Ming porcelain including Jiajing, Wanli, Xuande, Chenghua as well as Ming jades and bronzes.
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The BidAmount Asian Art Forum | Chinese Art
A free Asian art discussion board and Asian art message board for dealers and collectors of art and antiques from China, Japan, Korea, Thailand, Cambodia, Vietnam and the rest of Asia. Linked to all of the BidAmount Asian art reference areas, with videos from plcombs Asian Art and Bidamount on YouTube. Sign up also for the weekly BidAmount newsletter and catalogs of active eBay listing of Chinese porcelain, bronze, jades, robes, and paintings.
The art of calligraphy - and for the ancient Chinese it certainly was an art - aimed to demonstrate superior control and skill using brush and ink. Calligraphy established itself as one of the major Chinese art forms during the Han dynasty (206 BCE - 220 CE), and for two millennia after, all educated men were expected to be proficient at it.
The Museum’s collections of Asian art span nearly five millennia and encompass the cultures of China, the Himalayas, India, Japan, Korea, and Southeast Asia. In 2007, the Museum launched an initiative to create dedicated galleries for the collection, beginning with a gallery for the arts of Korea ...
Chinese art is full of symbolism, in that artists typically seek to depict some aspect of a totality of which they are intuitively aware.
China Online Museum is the finest online museum of Chinese art. It features Chinese calligraphy, painting, ceramics, bronzes, carving, and other artworks.
Chinese Ceramics & Works of Art. Overview Upcoming auctions Contacts Auction results ... Christie’s sales of Chinese ceramics and works of art showcase centuries of Chinese history. Held throughout the year in London, New York, Paris and Hong Kong, they attract a wide audience of collectors and connoisseurs vying for pieces as diverse as ...
Explore Asian Art Week. Contact the Specialist Department. Chinese Paintings ... Senior Specialist, Head of Sale. ehammer@christies.com. Tel:+1 212 641 5760. Bid in-person or online for the upcoming auction:Fine Chinese Paintings on 10 September 2019 at New York. Bid in-person or online for the upcoming auction:Fine Chinese Paintings on 10 ...
Discover an abundance of must-see art from all corners of a vast continent at Christie’s NY Asian Art Week. From contemporary classical and Chinese paintings to works with exemplary provenance from the Art Institute of Chicago, our Rockefeller Paza galleries will be full of ancient treasures and contemporary masterworks in a salute to the vibrant arts of Asia.
Sold to benefit The Art Institute of Chicago’s Asian Art Acquisition Fund, the sale features 84 lots with a focus on Ming and Qing porcelains, and offers a rare insight into the taste for collecting Chinese ceramics and works of art in the Midwest from the end of the 19th century through the 1980s. Highlights include two Wanli wucai garlic-head vases, a Qianlong mark and period, blue and ...
Specialist, Chinese Paintings, Christie's London Dr Malcolm McNeill is a Specialist in Chinese Paintings at Christie’s, based in London. He previously worked as an assistant curator of the Chinese collections and the Victoria and Albert Museum in London, as a researcher at the British Museum, and as a translator and tour guide at the National Palace Museum in Taipei.
The Christie's Education 2020 Conference: The Chinese Art Market 18 Jun 2019 Christie’s Education is delighted to announce our first international academic conference in Asia which will take place in Hong Kong from 26-27 November 2020 at the Hong Kong Convention and Exhibition Centre and will run in parallel with Christie’s Hong Kong Autumn Auctions.
The summer Chinese Art sale in Hong Kong will feature works of art from several private collections, including Qing porcelains and textile from the collection of the legendary Chinese art dealer A. W. Bahr (1877–1959), fine gilt bronze Buddhist sculptures from an old Hong Kong collection, an East Asian collection of Qing dynasty wine cups and jades, and a Japanese collection of Song ceramics ...
Sotheby's Chinese Works of Art Department holds two auctions each year in London, New York, Hong Kong and Paris.
Chinese Art - View Auction details, bid, buy and collect the various artworks at Sothebys Art Auction House.
With more than 340 Chinese works of art dating from the Neolithic to the Republic periods, highlights of this sale include a selection of Qing Imperial monochromes from the collection of Arnold and Blema Steinberg, early ceramics from the Art Institute of Chicago and Chinese porcelain and works of art from the collection of Henry Arnhold.
Results: Sotheby's Asia Week achieved $52.4 million in six strong auctions, exceeding pre-sale estimates. With 76.5% of lots sold and 60.3% of lots surpassing high estimates, the Asian art sales at Sotheby's indicate continued collector interest in the finest works of art from China, India and and the Himalayas.
Today's sale of Important Chinese Art will proceed as planned with sessions at 10 AM and 2 PM EDT. Sotheby's will be monitoring the weather conditions throughout the day and will be available to coordinate alternative bidding options should conditions make it difficult for clients to attend the auction in person.
Bonhams Chinese Art department is renowned for offering the finest works of art representing the richness and breadth of China's artistic heritage, particularly Imperial porcelain, white and spinach green jades, cloisonné and Buddhist art. Specialised international auctions are held globally, including London, Hong Kong and San Francisco.
Bonhams : Chinese Works of Art We use cookies to remember choices you make on functionality and personal features to enhance your experience to our site. By continuing to use our site you consent to the use of cookies. Please refer to our privacy and cookie policies for more information.
Bonhams Fine Art Auctioneers & Valuers: auctioneers of art, pictures, collectables and motor cars. We use cookies to remember choices you make on functionality and personal features to enhance your experience to our site. By continuing to use our site you consent to the use of cookies. ... Chinese Art (US) General enquiries
Bonhams : Fine Chinese Art We use cookies to remember choices you make on functionality and personal features to enhance your experience to our site. By continuing to use our site you consent to the use of cookies. Please refer to our privacy and cookie policies for more information.
Bonhams Fine Art Auctioneers & Valuers: auctioneers of art, pictures, collectables and motor cars Bonhams : Asian Art We use cookies to remember choices you make on functionality and personal features to enhance your experience to our site.
Bonhams are international auctioneers of fine Chinese and Japanese art. We specialise in rare Imperial and Export Chinese ceramics and works of art, as well as Japanese ceramics, fine and decorative works of art from the Neolithic Period to the 20th century. View on map
Bonhams Fine Art Auctioneers & Valuers: auctioneers of art, pictures, collectables and motor cars. We use cookies to remember choices you make on functionality and personal features to enhance your experience to our site. By continuing to use our site you consent to the use of cookies. ... Asian Art Bonhams. Work. 22 Queen St.