principles of low voltage distribution

... transformer and the low voltage switch switchboard (MLVS) to the distribution of power sockets and lighting to of ces, or power distribution to workshops Fig E38 : Radial distribution using busways ... short-circuit withstands up to 150 kA b Sub -distribution busbar trunking with low or high tap-off densities Downstream of main -distribution busbar trunking , two types of applications must be supplied: ... 11:52:14 E - Distribution in low- voltage installations Simplicity b Design can be carried out independently from the distribution and layout of current consumers b Performances are independent of implementation:...

Ngày tải lên: 28/10/2013, 03:15

Ngày tải lên: 25/12/2013, 10:38

... protection of semiconductor devices according to the following sections shall comply with all subclauses of • IEC 60269-1: Low- voltage fuses – Part 1: General requirements; and • IEC 60269-4: Low- voltage ... COMMISSION _ LOW- VOLTAGE FUSES – Part 4-1: Supplementary requirements for fuse-links for the protection of semiconductor devices – Sections I to III: Examples of types of standardized fuse-links ... 60269-4-1 has been prepared by subcommittee 32B: Low- voltage fuses, of IEC technical committee 32: Fuses The text of this standard is based on the following documents: FDIS Report on voting 32B/387/FDIS...

Ngày tải lên: 25/12/2013, 10:54

... 32B: Low- voltage Fuses, of I E C Technical Committee No 32: Fuses This third edition is derived from the second edition of I E C Publication 269-4 (1980), the text of which is based on the following ... devices for circuits of rated voltages up to 1O00 V a.c or circuits of nominal voltages up to 15OOV d.c and also, in so far as they are applicable, for circuits of higher nominal voltages Notes - ... For a.c., the rated voltage of a fuse-link is related to the applied voltage; it is based on the r.m.svalue of a sinusoidal a.c voltage It is further assumed that the applied voltage retains the...

Ngày tải lên: 25/12/2013, 10:55

... hóa đặc biệt để khắc phục ảnh hưởng nhiễu Hai khía cạnh đưa Shannon báo “A Maththemathical Theroy of Communication” xuất năm 1948 Bell System Technical Journal - nơi đưa lý thuyết thông tin Shannon ... định lý quan trọng cho kỹ sư truyền thông Tài liệu tham khảo C E Shannon "A Mathematical Theory of Communication." Bell System Technical Journal, Vol 27, 1948 Tất kỹ sư truyền thông phải đọc báo...

Ngày tải lên: 18/09/2012, 10:13

... “…spontaneous emergence of order…[allowed by] a constant flow of energy and matter through the system…[the] emergence of new structures and new forms of behavior…[which are] the hallmark of self-organization, ... analogous to the movement of sperms prior to fertilization The systems’ evolutionary phase follows the completion of the initial state but prior to a stage of a of the zone of order and the fully-functioning ... nonlinear dynamical system following the principles of organized complexity; stable boundaries depend on the efficacy of resetting mechanisms Outside of the boundaries of a well-functioning system’s...

Ngày tải lên: 26/10/2012, 10:04

... advance in the characterization of the molecular mechanisms of low concentration of ethanol in HepG2 cells Moreover, it constitutes a necessary step in the understanding of the molecular mechanisms ... 1mM concentration of ethanol in HepG2 cells [19] Int J Med Sci 2007, 32 Figure Functional genomics of low concentrations of ethanol in HepG2 cells (A) Reported interactions of each ethanol-regulated ... concentrations of ethanol (100 mM) induced the expression of genes involved in the metabolism of ethanol [16] In addition, the metabolism of ethanol 33 results in an increased production of toxic metabolites...

Ngày tải lên: 31/10/2012, 15:28

... deviation, and skewness of these 30 distributions, we present a statistical summary of the ranking approach in Table II Recall that skewness is a measure of the asymmetry of a distribution, and a ... regardless of the composition of commissioning sets, mean values of the seven confidence limits are typically less than %/mm over most of the range of depths and SSDs we examined, though quality of the ... percentage of maximum dose at the depth of the profile δ3: for points within the beam but away from the central axis, measured as a percentage difference of the local dose This includes points just off...

Ngày tải lên: 03/11/2012, 10:05

... Underlying such failures is often a lack of understanding of some of the key principles of service marketing and management Technological change affects many other types of services, too, from airfreight ... not-for-profit basis, but forprofit versions of each type of institution also exist CHAPTER ONE WHY STUDY SERVICES? MARKETING SERVICES VERSUS PHYSICAL GOODS The dynamic environment of services ... nature of these interactions strongly influences the customer's perceptions of service quality 14 Customers often judge the quality of the service they receive largely on their assessment of the...

Ngày tải lên: 07/02/2013, 09:52

... xác nhận quốc tế nguyên tắc luật hợp đồng Sự đời "Nguyên tắc Hợp đồng Thương mại Quốc tế " (Principles of International Commercial Contracts (sau gọi PICC)), UNIDROIT đề xướng nhằm vào hướng phát ... Quốc tế mang lại HỘI ĐỒNG UNIDROIT LỜI NÓI ĐẦU Những Nguyên tắc Hợp đồng Thương mại Quốc tế (Principles of International Commercial Contracts-được viết tắt theo Tiếng Anh PICC) trình bày quy định ... Viên Buôn Bán Hànghoá quốc tế (United Nationsconvention on cotracts for the International Sale of Good-CISG) mớI nêu xuất xứ Về nội dung, Nguyên tắc Hợp đồng Thương mại Quốc tế UNIDROIT soạn...

Ngày tải lên: 13/08/2013, 08:02

... allow for the health of our children, the quality of their education, or the joy of their play It does not include the beauty of our poetry or the strength of our marriages, the intelligence of ... Bureau of Economic Analysis (a part of the U.S Department of Commerce) from a large number of primary data sources.The goal of GDP is to summarize in a single number the dollar value of economic ... which equals the sum of wages and profit—the top half of the circular flow of dollars GDP is also the total expenditure on purchases of bread—the bottom half of the circular flow of dollars.To compute...

Ngày tải lên: 14/08/2013, 11:22

... factors of production flow from households to firms, and goods and services flow from firms to households The outer loop of the circular-flow diagram represents the corresponding flow of dollars ... factors of production (where firms are buyers and households are sellers) The outer set of arrows shows the flow of dollars, and the inner set of arrows shows the corresponding flow of goods ... factors of production Labor, land, MARKETS and capital FOR FACTORS OF PRODUCTION • Households sell Income • Firms buy ϭ Flow of goods and services ϭ Flow of dollars production, such as the wages of...

Ngày tải lên: 14/08/2013, 11:22

... market offer a return of 7%, then Cost of capital = r = 7% 16 Valuing an Office Building Step 3: Discount future cash flows PV = C1 (1+r) = 400 (1+.07) = 374 Step 4: Go ahead if PV of payoff exceeds ... present value of any cash flow 15 Valuing an Office Building Step 1: Forecast cash flows Cost of building = C0 = 350 Sale price in Year = C1 = 400 Step 2: Estimate opportunity cost of capital If ... higher rate of return w Higher required rates of return cause lower PVs PV of C1 = $400 at 7% 400 PV = = 374 + 07 19 Risk and Present Value PV of C1 = $400 at 12% 400 PV = = 357 + 12 PV of C1 = $400...

Ngày tải lên: 14/08/2013, 11:32

Ngày tải lên: 15/08/2013, 14:26

... share of their business Customer-perceived value The customer’s evaluation of the difference between all the benefits and all the costs of a marketing offer relative to those of competing offers ... blend of skills uniquely suited to writing an introductory marketing text Professor Kotler is one of the world’s leading authorities on marketing Professor Armstrong is an award-winning teacher of ... influential business writer/guru” of the twenty-first century Dr Kotler has served as chairman of the College on Marketing of the Institute of Management Sciences, a director of the American Marketing...

Ngày tải lên: 17/08/2013, 09:20

... in the distribution of the flow velocity is observed, caused by the influence of the axis (Figure 15 (b)) Relating Figure 15 (b) with (c), a certain similarity in the distribution of the flow velocity ... Figure Variation of discharge and binary with two and three pistons of double or single effect out of phase of 90º and 120º 3.2 Positive displacement pumps This engine consists mainly of a chamber ... degree of flow and binary capacity depends on the size of the rod when compared to the size of the handle There is an advantage in using the largest possible rod and in reducing the length of the...

Ngày tải lên: 05/09/2013, 15:28