D&Q Mining is a high-tech company integrating R&D, production and sales. It provides mature products and solutions such as crushers, sand making, milling equipment, mobile crushing stations, etc., for aggregate, mining and waste recycling.

Circuit breakers breaking capacity is the rated RMS value of current that a CB can break at the rated voltage. List of Contents1 Calculator2 Formula3 Calculations – Solved Examples4 Frequently asked questions Calculator Formula Breaking capacity (B.C) = 1.732 * V * I * 10-6 Where 1.732 = √3 represents a multiplier for three phase circuits []

More13/08/2020 Generally divided ultimate breaking capacity Icu breaking capacity and operating Ics (regardless of many micro-off), if Icu = 60KA, then when the 60KA fault current in the line, the circuit breaker can be safely cut off the circuit, without the occurrence of contact welding, explosion or other abnormal conditions.

Morehow to calculate capacity of rock breaker. Rock breaker Start Dredging. On some dredging projects, hard rock needs to be removed before dredging operations can begin. Even the strongest cutter suction dredgers will fail in solid, hard rock. The removal of rock then has to start with prefracturing. This can be done with the aid of explosives or ...

More23/04/2018 If a 4 cubic yard piece of hard rock (20,000 psi or greater) needs to be broken in half you will require a 7,500-ft. lb. or larger breaker. If a 2 cubic yard piece of limestone (20,000 psi or less) needs to be broken in half you will require a 3,000 – 5,000-ft. lb. breaker.

MoreThe CivilWeb Soil Bearing Capacity Calculation Excel Suite cannot be used to calculate the bearing capacity of rock though it does include a 74 page Ultimate Guide to rock and soil bearing capacities which details the BS 8004 procedure which the designer can use to determine the allowable bearing capacities of rock layers. Typical Bearing Capacity of Rock . For preliminary design it is often ...

MoreTo determine the appropriate size of circuit breaker for single phase supply, it depends on multiple factors like type of load, cable material and environment temperature etc. The general rule of thumb is that circuit breaker size should be 125% of the ampacity of cable and

MoreRock Breaker Capacity Calculator. Hydraulic Breakers For Excavators Jack Hammers Epiroc, Hydraulic breakers are the oldest hydraulic attachments for carriers the first serial manufactured rock breaker was the krupp hm 400 in 1967 and the patent was secured in 1963 Crusher jack hammers are impact devices designed to break any kind of rock or Rock Breaker Capacity Calculator . Email:

Morechange the hydraulic roughness and therefore the flow capacity. 2. Sizing of rock used in lining of drainage channels Table 1 provides the recommended design equations for sizing rock used in the lining of drainage channels. These same equations can be used to size rock placed on the banks of large drainage channels provided the bank slope does not exceed 1:2 (V:H). For a bank slope of 1:1.5 ...

MoreFor example, if a 4 cubic yard piece of hard rock (20,000 psi or greater) needs to be broken in half, a 7,500 ftlb or larger breaker is required. If a 2 cubic yard piece of limestone (20,000 psi or less) needs to be broken in half, a 3,000-5,000 ftlb breaker is required.

More12/02/2021 The same method of calculation can be used for any dedicated appliance circuit serving a single appliance. For example, a 240-volt electric water heater rated for 5,500 watts can be calculated in this way: A = 5,500 ÷ 240, or A = 22.9. But because the circuit requires a 20 percent safety margin, the circuit needs to provide at least 27.48 amps (120 percent of 22.9 = 27.48 amps). An ...

More21/11/2018 Circuit Breaker (MCB) calculation as per NEC. Single Phase (1 φ) = 300 % of FLC . Three Phase (3 φ) = 300 % of FLC. Synchronous motor = 300 % of FLC . Wound motor = 150% of FLC. Direct Current = 150% of FLC. Circuit Breaker (MCB) = 3 x 19.1 = 57.3 Amps (Available 63 Amps) Circuit Breaker (MCB) Instantaneous Trip Current Capacity as per NEC . Single Phase (Iph) = 800% of

More2) Short circuit breaking capacity ( If ) 3) Application type. Calculation for Miniature circuit breaker ( MCB ) sizing. Example : We want install 1 unit single phase motor.full load ampere is 20 ampere. Power supply 240VAC,50 Hz. 1) Ampere Rating ( In ) Formula : In = Iz + (0.25 x Iz) In = ampere rating Iz = Load ampere. Calculation :

MoreCircuit breaker sizing calculation for medium- and high-voltage circuit breakers basically involves two symmetrical current calculations, one for the first cycle duty and another for the interrupting duty. This guide presents a step-by-step approach. A sample calculation

MoreExcavation in earthwork for hard soil/ hard rock for a lead distance of 1km for following depths: a) Up to 1.5m. b) 1.5m to 3m. c) 3m to 4.5m. In the above examples of excavation, more number of descriptions are possible with different lead distance and type of soil. During tendering of civil engineering works, all the possible combinations are presented for quotations depending on the project ...

MoreCurrent Carrying Capacity Tables. The links below show tables of the current carrying capacity and voltage drops relating to Doncaster Cables products. Below these links you will find our cable calculator. Instructions below:-1. Choose your supply type (Single phase 230V / Three Phase 400V) 2. Choose your required voltage drop 3. Input the power in watts or current in amperes which you require ...

MoreCircuit Breaker. While the determination of the closing and latching duty is fairly a straightforward process, the calculation of the interrupting duty for medium- and high-voltage circuit breakers is a bit trickier. There are a few more things to consider in the calculation such as circuit breaker interrupting time and contact parting time, remote and local short circuit current sources (for ...

MoreThe Socomec Rock breaker range is available for light to heavy Crushers. The DMS Series for light to medium machines and the MDO Series for the medium to heavy Crusher machines. This leaflet focuses on the range vailable in the DMS series, suited to light to medium sized Excavators. Suitable for 0.7 tonne to 14 tonne Excavator machines. Proven reliability in the field. Superior Noise and ...

MoreRelated Surface Area Calculator Area Calculator. Volume is the quantification of the three-dimensional space a substance occupies. The SI unit for volume is the cubic meter, or m 3.By convention, the volume of a container is typically its capacity, and how much fluid it is able to hold, rather than the amount of space that the actual container displaces.

MoreActuate power circuit breaker trip and close coils. Operate motor-operated air breaks, motor-operated valves, pumps, and fans. Without DC backup power, you can damage substation and downstream equipment. People can also get hurt. Substation battery sizing calculation. The goal: to calculate the size of a flooded cell, lead-acid battery for a substation. The battery will have a rating of 125V ...

More05/07/2011 Hi, i'm a little confused about the way to calculate the amp of the circuit breaker for a three-phase system. If i have a power of 11.5 kW and voltage of 400V, what size circuit breaker is needed for three-phase system. My calculation was 11500/(1.732x400) = 16.6 Amps per phase ... 16.6 x 3 = 49.8 Amps, so i need a 50 Amp breaker. Please, tell me if i worked this out correctly, if not show me ...

More03/08/2018 Calculate the TOTAL amperage rating of all devices. Make sure they DO NOT exceed 80% of the breaker’s total amperage. Troubleshooting and inspecting your breaker panel. Your circuit breaker is an essential part in the safety of your home or building. It keeps your electrical wiring system from overheating. If you are experiencing frequent ...

MoreCalculate the circuit breaker interrupting duty using the following formula. Since reactances for ½ cycle and 1.5 – 4 cycle network are the same for both utility and generator, *Note: In calculating for the interrupting RMS symmetrical current, use reactances on the 1.5 – 4 cycle network. That’s it for circuit breaker sizing calculation.

MoreCircuit Breakers,Particularly calculation of C.B.Capacity is generally neglected by students,but is a very important ite.This has been observed by me that there was no proper response from the ...

MoreHOW TO CALCULATE BREAKER SIZE, WIRE SIZE AND WATTAGES The chart below will help you determine fuse or breaker size and the necessary wire size to service various wattage loads. To protect against material failures, the National Electric Code requires that most materials be de-rated 20%. This means that only an 80% load factor may be used when figuring electrical material needs and is

MoreThen its capacity considered is ((1×10)/0.04125) = 242.4242 m 3 / day. That means, a hydraulic Crusher can excavate 242.4242 m 3 of soil in one day. Its cost per day including driver and fuel is Rs. 5000. Then the cost of 10m 3 of excavation can be calculated as:

More13/02/2010 Divide the power rating by the voltage rating to determine the amount of amps the cable is capable of carry. The rated voltage for most service cables is 600 volts. Most households are fed by 240 volts, split into two cables at 120 volts apiece. 120 volts is approximately 1/5 of 600 volts.

MoreWARNING As with all calculators check your answer! (Iz) = current carryng capacity of the cable where it is installed. (It) = tabulated current for a single circuit at ambient temp of 30° (Ib) = the actual current to be carried. (In) = is the Circuit Breaker rating in Amps.(I2) = the current at which the CB opens. (Ca) = correction factor for Ambient temp. (Cg) = correction factor for ...

More13/06/2016 400A is the current carrying capacity of the VCB, protection is provided by a combination of the Current Transformer (CT) ratio and the Overload (O/L) relays. Protection relays are

More05/07/2011 If i have a power of 11.5 kW and voltage of 400V, what size circuit breaker is needed for three-phase system. My calculation was 11500/ (1.732x400) = 16.6 Amps per phase... 16.6 x 3 = 49.8 Amps, so i need a 50 Amp breaker.

MoreRelated Surface Area Calculator Area Calculator. Volume is the quantification of the three-dimensional space a substance occupies. The SI unit for volume is the cubic meter, or m 3.By convention, the volume of a container is typically its capacity, and how much fluid it is able to hold, rather than the amount of space that the actual container displaces.

MoreHow to calculate productivity of construction equipment like Crusher, dozer, rock breaker, riper.. Answer / vinod k I think 75% efficiency is correct as excavation of soil itself takes time depends upon the area where excavation is to be done, if the excavation area is mix of soil rocks then efficiency will be less No. of cycles/hr will also come down.

MoreCircuit breaker sizing calculation for medium- and high-voltage circuit breakers basically involves two symmetrical current calculations, one for the first cycle duty and another for the interrupting duty. This guide presents a step-by-step approach. A sample calculation

MoreWARNING As with all calculators check your answer! (Iz) = current carryng capacity of the cable where it is installed. (It) = tabulated current for a single circuit at ambient temp of 30° (Ib) = the actual current to be carried. (In) = is the Circuit Breaker rating in Amps.(I2) = the current at which the CB opens. (Ca) = correction factor for Ambient temp. (Cg) = correction factor for ...

MoreBreaker Run. What is Breaker Run? Breaker Run is manufactured like Granular B, but is more uniform and has a higher compaction quality. Why would I use Breaker Run? Breaker Run is useful for projects that require increased load bearing capacity, such as driveway or road base when a soft subsoil is encountered. It is usually topdressed with another aggregate. Calculate Breaker Run Rectangular ...

MoreThe Socomec Rock breaker range is available for light to heavy Crushers. The DMS Series for light to medium machines and the MDO Series for the medium to heavy Crusher machines. This leaflet focuses on the range vailable in the DMS series, suited to light to medium sized Excavators. Suitable for 0.7 tonne to 14 tonne Excavator machines. Proven reliability in the field. Superior Noise and ...

More50A Breaker (Double-Pole) To upgrade 120V AC distribution panel to 50A instead of 30A: View: 2: 20A Breaker: For load that requires 20A breaker (e.g. A/C) View: 3: 10A Breaker: For load that requires 10A breaker: View: 4: 120V AC Distribution Panel (6 Positions*) *6 Positions panel is sometimes cheaper, check it! View: 5: 12/3 AWG Triplex AC ...

More14/07/2020 Calculate the recommended maximum. Multiply the breaker maximum capacity by 80 per cent. This equals 2400 watts times 80 per cent or 1920 watts. Locate all of the appliances and devices that are connected to this circuit. Check each device for how many watts of power it uses. Write down the wattage of each device. If the wattage is not given, multiply the voltage of the device by the amount of ...

More13/06/2016 400A is the current carrying capacity of the VCB, protection is provided by a combination of the Current Transformer (CT) ratio and the Overload (O/L) relays. Protection relays are normally rated at 5A = 100% So for your 800KW motor with a Full Load Current (FLC) of 49A you could use 50/5A CT’s with the O/L’s set at say 110% or 100/5A CT’s with the O/L’s set at 55%. Both will give 110% ...

More05/07/2011 Hi, i'm a little confused about the way to calculate the amp of the circuit breaker for a three-phase system. If i have a power of 11.5 kW and voltage of 400V, what size circuit breaker is needed for three-phase system. My calculation was 11500/(1.732x400) = 16.6 Amps per phase ... 16.6 x 3 = 49.8 Amps, so i need a 50 Amp breaker. Please, tell me if i worked this out correctly, if not show me ...

More12/02/2021 The breaking capacity of a circuit breaker is lower than the value of its making capacity, which is the maximum voltage or current that the machine can conduct. As voltage and current increase, it becomes more difficult for a breaker to disrupt the flow of electricity, so the capacity is reached prior to the making capacity. At high levels, electrical current is capable of arcing, which allows ...

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