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Certificates The High Rating has been given Type-Approval Certifications by the most prestigious Electro-technical Agencies: • Certificate of Compliance with Standards CEI EN 60439-2 (CESI - LOVAG) • GOST Type-Approval Certification (Russia) • CESI certificate for IP30 - IP31 • Fire resistance measurements of the Fire Barrier • Electromagnetic emissions measurements 96 HIGH RATING
Determination of the operating current of a busbar In order to determine the current whereby it is necessary to choose the busbar, the following planning data must be known: • type of load inputs: three-phase or single-phase; • type of circuit input: from one end, from both ends, central input, etc.; • nominal input voltage; • number, power and cosφ of loads which are to be fed by the busbar; • load diversity factor; • load use nominal factor; • assumed short circuit current at the input point; • room temperature; • type of busbar installation (edgewise, flat, vertical). VOLTAGE DROP Δv% = b defined I b Vn L Δv% PTOT • α • β • d k I b = [A] √3 • Ue • cosϕ medium b =2 b =1 I b = 15 20 25 30 35 40 45 50 55 60 1.15 1.12 1.08 1.05 1.025 1 0.975 0.95 0.93 0.89 I nt ≥ I b I nt = k 1 • I n When using a three-phase power supply, the operating current is determined by the following formula: where: I b operating current [A]; α load diversity factor [.]; β load use factor [.]; d feed factor [.]; P TOT sum of the total active power of installed loads [W]; Ue operating voltage [V]; cosϕ medium average load power factor [.]; The “d” input factor has a value of 1 when the busbar is fed from one end only. The value is 1/2 if fed from the centre or if it is fed from each end. Once the operating current has been determined, choose the busbar with a rated current immediately higher than the one calculated. All Zucchini products have been designed and tested for an average room temperature of 40°C; should they be installed in rooms with average daily temperatures different from 40 °C the rated current of the busbar should be multiplied by a k1 factor that is greater than the unit for temperatures lower than 40°C and lower than the unit if the room temperature is higher than 40°C. Room temperature [°C] k 1 thermal correction factor [.] Finally, the following should be considered for the most appropriate busbar choice: where I nt represents the maximum current loaded by a busbar for an indefinite time at the specified room temperature. CHOICE OF THE RATING WHEN IN THE PRESENCE OF HARMONICS When in the presence of harmonics, and when using the chosen I nt rated current, the HP busbar to be used shall have the rating specified in the following table: rated current 630A 800A 1000A 1250A 1600A 2000A 2500A 3200A 4000A 5000A HP busbar to be used: THD ≤ 15% 630A 800A 1000A 1250A 1600A 2000A 2500A 3200A 4000A 5000A 15% < THD ≤ 33% 800A 1000A 1250A 1600A 2000A 2500A 3200A 4000A 5000A - THD > 33% 1000A 1250A 1600A 2000A 2500A 3200A 4000A 5000A - - If the length of the line is particularly long (>100m) it is necessary to check the voltage drop (hereinafter specified as v.d.). If the installation is a three phase system and the power factor is not lower than cosφ = 0.7 the v.d. may be calculated with the coefficients of the voltage drop specified in the technical data table. k . I b . L Vn . 10 6 . 100 = the current that supplies the busbar [A] = the voltage power supply of the busbar [V] = the length of the busbar [m] = the voltage drop percentage b = the distribution factor of the current [.] = corresponding voltage drop factor a cosϕ [ V/m/A] (see technical data table) The current distribution factor “b” depends on how the circuit is fed and on the distribution of the electric loads along the busbar: supplies at one end and load at the end of the line supplies at one end and with load evenly distributed b =0.5 supplies at both ends and with load evenly distributed b =0.5 central supply with loads at both ends b =0.25 central supply with load distributed evenly example: SCP 2000A Al for riser mains feed 1600A operating current b=1 supply from one end k=28.7 see technical data table, page 52 (SCP 2000A Al cosϕ = 0.85) Cosϕ = 0.85 L= 100m line length Vn= 400V operating voltage I b L I b I b L I b L I b I b 2 L I b I b 2 Δv% = 1 . 28.7 . 1600 . 100 400 . 10 6 . 100= 1.15% SHORT-CIRCUIT CURRENT The short circuit current value I CW that can be supported by our busbar trunking systems allows for both electrodynamic stress and thermal energy dissipated during the fault. The busbars must be able to sustain the short circuit current for the entire duration of the fault - i.e. for the time required for the protective device (circ. breacker) to start operating, cutting off the metal continuity and extinguishing the electric arc. JOULE EFFECT LOSSES Losses due to the Joule effect are essentially caused by the electrical resistance of the busbar. Lost energy is transformed into heat and contributes to the heating of the conduit. Three-phase rating Single phase rating P = 3 • R t • I b 2 • 10 -3 [W/m] P = 2 • R t • I b2 • 10 -3 [W/m] MAS400 HR HIGH RATING 97 HIGH POWER GENERAL <strong>CATALOGUE</strong>
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High Power SCP - HR - EdM CATALOGUE
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Integrated solutions for global pro
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HIGH POWER A simple and innovative
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SUPER COMPACT - SCP 6 SUPER COMPACT
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SCP Features SCP is the Zucchini li
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General structural features The out
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Main features of the SCP line Strai
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Feeder elements FEEDER ELEMENT - ST
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Trunking components EXPANSION ELEME
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Direction changes HORIZONTAL ELBOW
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Direction changes DOUBLE HORIZONTAL
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Direction changes DOUBLE ELBOW HORI
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Direction changes VERTICAL “T”
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Connection interfaces STANDARD CONN
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Connection interfaces CONNECTION IN
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Connection interfaces CONNECTION IN
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Connections interfaces CONNECTION I
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Complementary run components SECTIO
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Feed units END FEED UNIT Aluminium
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Tap-off boxes EMPTY TAP-OFF BOX 125
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Tap-off boxes EMPTY TAP-OFF BOX 63A
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Fixing supports BRACKETS FOR VERTIC
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Transposition element End cover TRA
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Page 52 and 53: Installation guidelines MINIMUM DIS
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Page 64 and 65: HIGH RATING - HR 62 HIGH RATING
Page 66 and 67: HR Features HR is the Zucchini line
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Page 70 and 71: Feeder elements FEEDER ELEMENT Alum
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Page 88 and 89: Feed units END FEED UNIT Aluminium
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Page 92 and 93: Zucchini transformer connections FL
Page 94 and 95: Installation instructions INSTALLAT
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Page 134 and 135: Accessories TEMPERATURE MEASUREMENT
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