Copper and Aluminum busbars

Transcription

1 Copper and Aluminum busbars Two metals are currently used as conductors in electric panel boards: copper and aluminum In particular, when in need to define a power distribution inside an electric panel board, one mainly chooses to use drawn bars, using both the abovementioned metals. In configuring a bar distribution system, one must consider some parameters, both electrical and mechanical, such as, for example: electrical parameters: rated intensity value to carry based on the conductor cross-section and number, and the resulting voltage loss. mechanical parameters: bar size and number, based on panel board dimensions and on their mechanical resistance. Other factors to consider, which might limit the passage of current through the selected conductors, are linked to the working temperature of the conductor and to its capability to dissipate heat. In electricity, there is also a phenomenon called "skin effect" which determines the concentration of current on the conductors surface. The best conductor is therefore a flat one, such as drawn bars, in which the bar length and thickness ratio is the highest possible. E.g. for the same cross-section in sq. and working temperature, a 0x bar carries. Ampere, whereas the same cross-section, with a 0 x bar carries.9 Amp (cf. ampacity values on page 6, table for solid copper bars, referred to a ΔT 0 C). ADVANTAGE Prepunched and threaded copper bars olid aluminum bars ready to use For the same cross-section with copper bar, a significant weight saving, no need of punching tools up to 70% less, with an ampacity reduction of about %. wiring time savings ignificant economic advantage due to the different cost of the raw material and, especially, the great difference in the weight/volume ratio. TECHNICA FEATURE Copper bars Electrolytic copper Cu-ETP 99.90% Rounded corners tensile strength: 0 N / sq. resistivity: 0,07 Ω / ² x meter density: 8.9 kg/cu.dm Aluminum bars Aluminum type EN-AW A Rounded corners tensile strength: N/sq. resistivity: Ω / ² x meter density:.7 kg/cu.dm

2 Copper and Aluminum busbars THREADED COPPER AR Thickness ength 00 and 000 RF0990 RF099 RF00 RF0 RF RF RF6 RF0 RF RF RF RF RF0 RF RF RF XX00 RF XX00 RF XX00 RF XX00 RF XX00 RF 0XX00 RF XX00 RF XX00 RF XX000 RF XX000 RF XX000 PC RF 0XX000 RF XX000 RF xx000 W RF XX P M Ø M M M M M M8 PREPUNCHED COPPER AR Thickness - ength 70 RP00 RP0 RP RP RP0 RP RP RP RP0 RP RP0 RP X RP 0X RP 6X RP X RP 0X RP X RP 0X RP X RP X RP 0X RP 0X P D Ø OID COPPER AR Thickness - ength about 00 PRP0990 PRP00 PRP0 PRP PRP PRP0 PRP PRP PRP PRP0 PRP PRP0 PRP PRP PRP6 PRP70 PRP7 PRP PRP8 PRP X PRP 0x PRP x PRP x PRP 0x PRP 0x PRP x PRP x PRP 0x PRP x PRP x PRP 0x PRP 0x PRP x PRP x PRP 0x PRP 0x PRP x PRP 00x OID AUMINUM AR Thickness ength 000 AP000 AP00 AP0 AP0 AP00 AP0 AP0 AP0 AP 0xx000 AP xx000 AP 0xx000 AP 0xx000 AP xx000 AP xx000 AP 0xx000 AP 0xx000 /mt

3 Copper and Aluminum busbars - Ampacities table Ampacity table Copper bar based on the ΔT temperature increase as per standard DIN 67 room temperature C THREADED COPPER AR x x x x x 0 x x x x x ² ΔT C ΔT 0 C PREPUNCHED COPPER AR ² ΔT C ΔT 0 C X 0X 6X X 0X X 0X X X 0X 0X OID COPPER AR Example of bar choice for In = 0 A for Tmax = 8 C with copper prepunched bar 6 x In = 9 Amp with solid copper bar 6 x In = 9 Amp 0 x In = 9 Amp with solid aluminum bar 0 x In = 87 Amp cf. tables with Δ T = 0 C where: Tmax = max. considered working temperature Ta = reference room temperature Δ T = temperature increase in C Tmax = 0 + = 8 C ² /mt ΔT C ΔT 0 C x x x 0 x x x x 0 x 0 x x 6 x x 0 x x 0 x x 0 x 0 x x x 0 x 0 x x 00 x Ampacity table Aluminum bar based on the ΔT temperature increase as per standard DIN 670 room temperature C OID AUMINUM AR ² /mt ΔT C ΔT 0 C 6 0 x x 0 x 0 x x x 0 x 0 x

4 OC - Direct hook-up distribution block on copper busbars rass distribution block for - and - thick copper bars. Made of: ) no-punching connection unit on solid copper bar ) 8-output distribution block unit. to sq. cable sect. (direct connection on - pitch prepunched bars) made of brass with hexagonal tightening screws ADVANTAGE The connection unit can be used as a guide to make punching the - and - thick bars easier. pacing two or three prepunched bars becomes simple using the connection unit as a guide. imple and quick derivations with cables up to 6 and/or sq. (terminal lug) which can be used up to 00 A. Use with solid bar: Use both the units; no punching needed to fit the connection unit directly on the bar side. Use with prepunched bar: Use only the distribution block unit on single bar phase systems. Use both units on multi bar phase systems. OC00 OC0 OC OC RIP 8 * OC KIT 8 - ** OC KIT 8 - ** A C C 7 * OC RIP 8 8-output distribution block unit ** OC KIT 8-8-output distribution block unit + connection unit on - thick bar ** OC KIT 8-8-output distribution block unit + connection unit on - thick bar D - Outputs tripped cable sect. ² Cable sect. with ferrule ² Nr. outputs OC00 OUT OUT

5 Connectors for busbars Terminals for cable These allow direct connection of a flexible cable, previously stripped, up to the 0 sq. cross-section on - and - thick solid copper bars without having to punch them and to use the relevant lug on the cable. The stripped cable is fitted and tightened on the bar by a metal plate, thus preventing the wires to break. Easy and quick to use, they allow interventions on already fitted bar systems without having to dismantle them to perform the relevant punching. Compliant with standard EN 998-:00 European directive 006/9/EC ow Voltage equipment Directive RoH. TECHNICA FEATURE Terminals Passivated galvanized steel Connections on copper bars and thick Used cable cross-sections: from. to 0 sq. crewdriver head for sect. 6 and sq. MCR00 MCR0 MCR MCR MCR0 MCR MCR MCR MCR0 MCR x6 MCR x MCR x70 MCR x0 MCR x6 MCR x MCR x70 MCR x0 MCR xm H Terminals for - thick bars Terminals for - thick bars pider connector for threaded bars 0 for x and x threaded bars Cable crosssection ², , MCR0 usbar clamps for solid and flexible bars These allow direct connection, without punching and bolting, between rigid copper bar systems or with insulated flexible bars. Easy and quick to use, they allow interventions on already fitted bar systems without having to dismantle them to perform the relevant punching. usbar clamps Electrolytic galvanized steel Max. tightening thickness 0 (with supplied screws) Plate thickness R00 R0 R R R0 R Q00 Q0 Q Q Q0 Q R 0x R 0x R 0x0 R x R x R x0 Q x Q 0x0 Q 0x0 Q 6x6 Q x Q 0x0 E C A Ø / D 8.-M8 8.-M8 8.-M8 8.-M8 8.-M8 8.-M M8 8.-M8.-M.-M imetallic (CU-A) sheets and washers HEET WAHER PM00 PM 0x0 A 0 0 Thickness.0 PM000 PM00 PM0 PM0 RM RM M8 RM M RM M ØD 8 For connections between Copper and Aluminum ØD Thickness