example: A DC busbar with 38000

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For example: A DC busbar with 38000A current, 200 v dc I will appreciate any help you can provide. 0000001147 00000 n Then it will want to bank back and be a massive resistance as its going back into a very small area? Safety issues are tricky at best. ; J Chemicals &Consumables There is a resistance due to the contact of the two pieces (header bar-busbar) and this can be calculated using Holm's equation (is an inverse function of the square root of load), however I have differing ideas in how to calculate the resistance through the buswork (through the triangular bar) as the contact is initially on the edge, rather than the end of the triangle. 0000073034 00000 n I just want to make sure I keep to the correct PCD for the bolts as to not affect the load capacity of the busbar negatively. 9H^Q_P4s25g]DhE=E{H }JSm1G=7B The ampacity rating is based on a 30C rise above a 40C ambient. Then again, 100 m is pretty long for a DC bus run. The length of the run is not totally irrelevant, but for typical plating shop runs, like 10.5 m, it's not real important. Architecural Manufacturers & Distributors, Architectural Installation Contractors Database, UNS Standard Designation for Wrought and Cast Copper, ASTM Standard Designation for Wrought and Cast Copper and Copper Alloys, European Numbering System for Non-Ferrous Metals, The U.S. Copper Industry: Critical to Keeping the U.S. So you would need 645 * 400/1000 = 258 square millimeters, and you've only got 228. Please introduce yourself and your situation. I want to measure the end resistance and inductance of a bus bar. 0000003673 00000 n The surface roughening that may occur at the bend is not serious as long as it is only a surface condition. Please advise. How to calculate DC bus bar current carrying capacity with respect to temperature. Don't forget to check the ampacity of the anode rod when you fix the cathode rod. In any case, you obviously should minimize potential exposure to live circuits even though they are only 24 V, and people in the area should clearly understand the situation. 0000037369 00000 n <]>> This is specifically regarding hard chrome plating but can be applied to other types of plating as well. There should be no spot on the switch where the cross sectional area of the copper is less than 1/5 in2 because the current carrying capacity of copper is 1000 A/in2. Thanks & Regards. Does this essentially double the current carrying capacity of the cathode bar (almost like having 2 shorter cathode bars end-to-end each with 2250A current capacity)? Q. 0000012757 00000 n Good question. Sorry that it's hard to be of much more help from such a distance. 0000003445 00000 n A. Hi Mike. Consult'g, Train'g& Software, About/Contact-Privacy Policy-1995-2022 finishing.com, Pine Beach, New Jersey, USA, -- this entry appended to this thread by editor in lieu of spawning a duplicative thread, Plating shop owner - Vsetin, Czech Republic, product designer - hyderabad, A.P., India, Transformers - Mumbai, Maharashtra, India. You need at least two, not one, 12 mm x 100 mm busbars, although most experienced installers would probably use four or five 6 mm x 100 mm bars instead. 0000001593 00000 n The rectifier terminal often implies what size bus bar the rectifier manufacturer feels is appropriate. 0000001317 00000 n In same current, copper which apply to DC circuit should be larger than AC 50Hz circuit? Copyright 2022 Copper Development Association Inc. All Rights Reserved. Obviously, this is a suggestion only applicable to submerged plating jigs, and not to be extrapolated that it's okay to figure steel as 10 percent of copper in all applications :-). plating on plastics - New Delhi, India. I think that page should be fine for AC current calculations. I think that we can see from Ohm's Law that the knife-edge contact is not causing a significant resistance, and we can see (with a thermal scanner if not by hand) that there is no dangerous heat buildup at the knife edge. And would it make any difference if use cables instead of copper bars. 0000023458 00000 n There should be no decline. Welding cable is often used because it's both flexible and designed to carry substantial currents. Sorry, but we'd just run in circles and never get anywhere if, after 30 postings on a subject, instead of asking for specific clarifications people just say "start over and tell me everything" :-). So basically I will be making up the busbars myself with a whole lot of 3/8 bolts. 0000011129 00000 n The resistance of the bus bar is calculated as: R = x l / A Thanks again, Kurt. Q. Hi Ted. 0000004706 00000 n 0000001800 00000 n Fits your number perfectly. My amperage requirement is only 1500A, but I've overspec'd for heat, losses etc in the system. 0000001731 00000 n 3) Will the size be different for DC and AC 50 Hz? My name is drew and I would like to know if conductivity of copper buss bars degrades with the accumulation of green corrosion. Are you sure the copper is all hard drawn electrolytically pure? The ampacities that follow are from Table 5 of Standard T1.311, and are reproduced here solely for the convenience of the viewer. More details about Bus bar: What is Busbar Current Carrying Capacity Calculation 5 Types of Busbarif(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'electrical4u_net-medrectangle-3','ezslot_5',124,'0','0'])};if(typeof __ez_fad_position != 'undefined'){__ez_fad_position('div-gpt-ad-electrical4u_net-medrectangle-3-0')}; As the stated thumb rule that the aluminium carries 0.8 times of the area, copper will be 1.2 times, silver will be 1.6 times, iron and GI will be 0.6 times. We electroplate zinc onto ordinary Link chain at 9 VDC @ 3000A. Maximum current 400 A on 8 ~ 10 V DC. 0000000776 00000 n If there is something you don't understand on this page, we'll be happy to try to explain it in different words until it is completely clear. DC currents have no inductance; inductance is the voltage induced rather by a non-steady-state current. : I have copper bus bar width = 14 mm, thickness= 6 mm, temperature 100 degrees -- so how to calculate current carrying capacity.

Did you wire brush the joints and apply conductive joint compound?

Are there any tables of recommended solid conductor sizes for dc current similar to what is used for home wiring? Cables are widely used in plating shops. 2. I cannot reuse them and I don't want to. I have always understood that the Rise in Celsius is the rise over ambient or resting temperature. Q. In other words, how large does the cross section of the steel fixture have to be in to facilitate proper current flow or at least so that it does not overheat and fail mechanically. 0000034399 00000 n To the degree that they suggest that copper can only carry 70 to 87 percent of what we know for a fact that it has safely and reliably carried in tens of thousands of plating and anodizing installations over 5 or more decades, I think it is they who need to go back to the drawing board :-). 0000001572 00000 n %%EOF If you are seeking a product or service related to metal finishing, please check these Directories: Jobshops Sorry, I don't know the codes regarding short circuit protection (if any) in your situation, and my main experience is with low voltage busbar, not 200 V busbar. e.g. 0000052104 00000 n trailer << /Size 64 /Info 22 0 R /Root 25 0 R /Prev 176828 /ID[<0106a25d7d8876649a4975b7d4d938f4><263729f7b2ee924bb0cf4b5d40b4daf1>] >> startxref 0 %%EOF 25 0 obj << /Type /Catalog /Pages 21 0 R /Metadata 23 0 R /PageLabels 20 0 R >> endobj 62 0 obj << /S 170 /L 285 /Filter /FlateDecode /Length 63 0 R >> stream Hence the formula for calculating current carrying capacity,if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'electrical4u_net-medrectangle-4','ezslot_6',109,'0','0'])};if(typeof __ez_fad_position != 'undefined'){__ez_fad_position('div-gpt-ad-electrical4u_net-medrectangle-4-0')}; Copper busbar current carrying capacity = 1.2 * Busbar width in mm * Thickness in mm Amps, Aluminium busbar current carrying capacity = 0.8 * Busbar width in mm * Thickness in mm Amps, Iron busbar current Carrying capacity = 0.6 * Busbar width in mm * Thickness in mm Amps, Galvanized busbar current Carrying capacity = 0.6 * Busbar width in mm * Thickness in mm Amps, Silver busbar current Carrying capacity = 1.6 * Busbar width in mm * Thickness in mm Amps. A. A. Hello again, Petr. CapitalEquipment The following tables have been provided by the Alliance for Telecommunications Industry Solutions (ATIS), T1 Committee, and represent ampacities for busbar sizes and arrangements typically found in the telecommunications industry. Q. Hb```f`` P @Qk&00L&,>Ib1O@Ae7N+S.k:Y$l6P0v There are too heavy and dirty. 0000003969 00000 n Here in the USA and in the electroplating industry, the nice round number of 1000 Amps per square inch for open bus bar was universally accepted long before I entered the industry, and that was over 60 years ago :-) And if this loss of performance is enough to change or clean the buss bar. That is, we have a macro thumb-rule that a square inch of copper can carry 1000 Amps, and we don't apply that macro rule to a micro situation. 0000014459 00000 n 0000001240 00000 n BBat)[9L(y]1Vu5r7xnGY/ We do not generally like the copper to come in contact with the plating solution. Although it's true that the insulation may make them get somewhat warmer than an open bus bar, I've never personally seen a problem if the old thumbrule of one square inch per 1000 amps of rectifier capacity is used. Operational, Copper - The World's Most Reusable Resource, Safe Drinking Water Act and Copper Alloys, Toxicological Differences in Lead and Copper, Lead-free Solders for Drinking Water Plumbing Systems, Alliance for Telecommunications Industry Solutions. i. Ted Although voltage drop is proportional to the length of the bus bar, it's not conventional to use different cross-sections of bus bar for lengths of 6 meters vs 1 meter. I have a rectifier it gives output 24 volts DC and 15000 amps at source to load in distance 6 m, 5 m, 2 m, 1 m. At what size of busbar(or) cables are taken my application and what type of insulation I prefer to the bus bus at safe conditions. 1.68 x 10-8 ohm-m x 100 m / (1600 mm2 x 1 m2 / 1,000,000 mm2), so: 0000005266 00000 n Thanks. 0000000016 00000 n Steel is an alloy, and the conductivity of alloys varies very widely, with some stainless steels being only 3 percent as conductive as copper, and some plains steels close to 15 percent, so it's hard to put a perfect number on this. @ |Kj ;!EGK#&0l"W^Ui0o?wYlnd)Ffvk3mm3;0UE$00b-+fBf[ mKnw'k1Ke/e{SE(Y9k>.VE/xqEaBIM}y7:7"{88Q(Q.PrC(!y$-?^DR Thanks and Warm Regards A. Hi Shiva. But unfortunately I have no actual experience in short peak loads, so I can't answer from experience. I think you may need to retain an experienced electrician, electrical engineer, or plating consultant -- someone who has worked with this stuff and is familiar with the concepts being discussed. Then press the calculate button, you get the aluminium or copper busbar current carrying capacity in amps. And V = I x R, so I get: I know that the surface corrosion will have a very small impact but that the connections could be significant. Thank you for very useful information; I have question as I work only in AC and I'm managing project for DC busbar with the following data: length 100 m, Current 2000 A, Voltage 48 V, size 1600 mm2. Distance from rectifier to tank is 10.5 m. 3. Generally, the allowable temperature rise is fairly low and it doesn't do much good to design to a higher allowable temperature rise anyway -- because conductivity is inversely proportional to temperature. We still say the ampacity is 1000 Amps; we don't calculate a reduced capacity based on the smaller contact area we see in the microscope. 0000037582 00000 n Parts are hung in the tank using steel fixtures with copper strips to aid the current flow as far as it is possible. 0000002933 00000 n Mike. 0000008590 00000 n The allowable current carrying capacity of enclosed bus bar in bus ducts is a little bit lower because of lack of cooling; since bus duct is a standardized product, you'll see the numbers in product literature and electrical codes. The current size of copper busbar which link from rectifier to chrome tank is 12 mm x 100 mm. xb```b``vc`e` |@QYAUVMom;xvPZk'm\2k`` AE+20EXN[AyR~`?e?k1@U ' 0000020501 00000 n Ray. HTPn0Stt4$>v@$@FGq++N:d3 2m8w4zh!/iD0z'!/H-XYOpB]j QJ{Awu47]V|Yrx1-8oY-` j` That means I'd go with 100 Amps/sq.in. Q. I have read your thread and would like to know what you have to say regarding the corrosion and its effect on conductivity as well as any experience you have with cleaning the buss bars and methods to minimize the accumulation of green corrosion. Which methods I can apply to do the same. DC causes greater heating of the bus. Good luck. but after looking up your company, I don't think that's the case, and what you will read on this page may be misleading :-(. I don't have any knowledge of busbar size calculation; please send me choice of a correct busbar sizes for required current rating. %PDF-1.5 % Calculate the 150 x 25 mm busbar current carrying capacity in all the above materials. Hopefully someone who knows will help us. A 1/4" x 4" buss however is at 1250 amps. I have seen plating shops clear coat or lacquer their bus bar runs (except for the connections of course) and it does seem to hold up well and to look better than streaky green stained copper. here length or long does not affect the current carrying capacity of the busbar. 0000005512 00000 n In stating that, my questions are simple. I visited a GE or Westinghouse bus bar plant decades ago where they hung bus bar vertically and dipped it 4"-6" deep into the plating solution to plate the ends. Q. How to size this stuff has been explained numerous times just on this one thread alone, and if you can't follow it sufficiently to do the arithmetic yourself, you don't understand enough to install bus bar without guidance. Apex Tool Group - York, Pennsylvania USA, (your purchases make finishing.com possible). I've used 1000 Amps / square inch (in open air) in plating and anodizing shops for many decades, so I think 1/10 of a square inch would be correct for 100 Amps continuous load. The number of sizes shown are not as extensive as those in the tables of AC ampacities, and there may be slight discrepancies between the ampacities shown here and those obtained by calculations derived from AC ampacities. 0000005026 00000 n note: Please! 56 0 obj<>stream 0000012813 00000 n %PDF-1.3 % Ceiling Fan Power Consumption Calculation, Power Saving Tips, What is Busbar Current Carrying Capacity Calculation 5 Types of Busbar, AP Electricity Bill Calculator & Rate Per unit Cost 2022, Karnataka Bescom electricity bill calculator & Latest Tariff 2022, DHBVN Electricity Calculator & Per Unit Rate DHBVN, IDMT Tripping Time Calculator, Formula, Calculation, Battery Life Calculator, Formula, Example, Formula, Torque conversion Calculation, Formula, Example, T-Match Impedance Matching Calculation, Formula, Example, Strip line Trace Width Calculation, Formula, Example, Circular Waveguide Calculation, Formula, Example, VSWR Return Loss Calculation, Formula, Example, Trace resistance Calculation, Formula, Example, Tank circuit resonance Calculation, Formula, Example, T-Pad Attenuator Calculation, Formula, Example, Skin Depth Calculator, Calculation With Example, ITI Electrician Whatsapp Group Links Join, 1500+ Active Electrical Engineering WhatsApp Group Links Join, Top 10 Electrical Website for Electrical Engineering Students, Copper bar carries 4500Amps (1.2 x 150 x 25) current, Aluminium Carries 3000 Amps (0.8 x 150 x 25) Current, GI Bus Bar Carries 2250 Amps (0.6*150*25) Current. If you wish to purchase a copy of the complete Standard, please visit the ATIS Document Center. But the fact is, 1000 Amps/sq. Any ideas would be welcome. I currently have 1/4" x 3" Buss bar on my tanks, which according to the charts, is rated at 1500 amps at a 65 degree Celsius rise? The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful. How to calculate copper bus size for the Continuous DC load of 100A & a peak load of 200A for 1 Sec. Ed. 0000000998 00000 n Q. DC resistance of copper bus bar. Sunny. Would appreciate some help. But please keep the discussion moving forward by trying your very best to phrase ongoing questions in terms of the answers that have already been offered. Thank you very much for your post.

3bi50PK k`eiWj. This gives you measurable but not excessive voltage drops, and warm but not hot bus bars. 0000008406 00000 n 24 0 obj << /Linearized 1 /O 26 /H [ 1240 353 ] /L 177436 /E 115625 /N 4 /T 176838 >> endobj xref 24 40 0000000016 00000 n and as stated above it's in line with 1000 Amp/sq.in. Q. I would, however, like to make a suggestion. I have had a hard time finding information regarding this. Thanks! I understand resistivity of metals increases with temperature and that I can decrease resistance by increasing the cross section of the conductor, but how do I know at what temperature (resistivity) will the conductor arrive if I send a given current through it? A quick study of their ampacity tables complicates the issue even more. Thanks, Kurt. Z ig[c7y6tl6 Q"*&}w ]BSA!(jB%[3HRe0%>C\~KyIwz[ q54fZ=6a7fv.ES:ElG5v_1*bTc1N1VI5McnlRI36VN46jehA Nn~Od[JnMqQ-cp_XdcJr,Ri}v9l/)fohp:=?H'L}NxT Fp0ZF0T=T&Cnq3~*Bg8Q):NTwO e?=P'Iti`=);F&!x}6~!

Q. I think that's the case with the triangular bus bars, which are intended to deliver a knife-edge (and therefore better) contact surface. I reached out to the folks at Storm Copper for validation. 0000026542 00000 n My opinion, and that's all it is, is that you should have ordered 6 mm x 52 mm (1/4" x 2") bars. I have never claimed to be an electrical engineer, but have run a lot of wire in my day. But whether you should proceed or start over may be a different question, and I suspect that most people would advise you to just continue :-).

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example: A DC busbar with 38000