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how to select fuse size

Always select a fuse size to protect the wire according to its rating. For everyday use, it's a good idea to expose the breaker to a maximum of 80% of the rated amperage. Say the power is 500 watts.

Fuses can be selected by characteristics, construction and classes. If nuisance tripping is a problem with this fuse selection, NEC does allow 225% of the largest motor FLA to be used in lieu of 175% when calculating the size. The table will give you the size of the short circuit protection as … Calculate Size of Contactor, Fuse, C.B, O/L of DOL Starter Calculate Size of each Part of DOL starter for The System Voltage 415V ,5HP Three Phase House hold Application Induction Motor ,Code A, Motor efficiency 80%,Motor RPM 750 ,Power Factor 0.8 , Overload Relay of Starter is Put before Motor.

For this example, we are going to wire the 12v distribution block to the bus bar then wire a string of lights to the 12v distribution block.All with appropriately fused with properly sized wires. Click here to send us an email.. Click here for software support. In some cases, a product manufacturer will specify a fuse value and it will usually be lower than that required for protecting the wire. Step 1: Find the wire size for the 12v fuse block. What is a Fuse?
For a household circuit, a 15-amp fuse should be used in this circuit. How to calculate fuse rating But what if you have a current draw that is greater than one value of fuse but less than another (i.e. Picking a fuse for your circuit isn’t as easy as it sounds.

In order to select the right amperage of the fuse, you first need to know the full-load ... What are the physical size limitations?
Example -2 Always select a fuse size to protect the wire according to its rating. Calculate Size of Circuit Breaker or Fuse on Primary and Secondary side of Transformer having following Detail Transformer Details(P)= 1000KVA Primary Voltage (Vp)= 11000 Volt Secondary Voltage (Vs)= 430 Volt Transformer Impedance= 5% Transformer Connection = Delta / Star Transformer is in unsupervised condition. Say the calculated fuse rating is 10.6421 amps, use a 13 amp fuse. In description of the fuse block, it says the block has a 100A minimum. In some cases, a product manufacturer will specify a fuse value and it will usually be lower than that required for protecting the cable. Locate where your motor falls in table 430.52 based on the full load current and motor size. Calculations: Transformer Primary Current (Ip)= P/1.732xVp Transformer … 135 amp)? Class CC fuses, for example, represent the non-renewable devices used for the protection of short-time overload components and non-inductive loads, as well as motor circuits. RNK Distributing 2562 Western Ave Knoxville, TN 37921 Phone: (865) 549-5115 Fax: (865) 549-5116 Toll Free (877) 331-0034. 0402 chip size (.041”L×.020”W×.012”H) up to the 5 AG, also commonly known as a”MIDGET” fuse (13/32” It's fine to exceed this for short periods of time, but continuous current above this amount could cause enough heat to trip the breaker. In this case you have the option of either choosing a 125 amp fuse or a 150 amp fuse. Choosing correct fuse amperage and the best fuse holder or fuse block will help protect your caravan or boat and your safety. Fuse Size - Using the method in item two you'll be able to choose the size of the fuse you need. If you've shopped for electrical wire, you have likely noticed that there are many types and sizes of wire to choose from. In this case, the calculation is as follows (the next largest standard fuse size in this case is 45 A): (2.25 x 7.6) + (2 x 4.8) + (5 x 3.4) = 43.7 A. Fuse Rating Calculations. In the case of a 110-volt circuit, using 1200 watts, the calculation would be: 1200/110=10.9 amps.


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