answersLogoWhite

0


Best Answer

60

User Avatar

Dortha Miller

Lvl 10
3y ago
This answer is:
User Avatar
More answers
User Avatar

Wiki User

15y ago

THIS CONSIDERATIONS SHOULD BE STRICTLY FOLLOWED: SOUND ENGINEERING AND ACCEPTABLE ECONOMICS; 1.DEFINE DEMAND LOAD - AFTER APPLYING POWER FACTOR AND EFFICIENCY FOR MOTOR LOADS AND ACTUAL SYSTEM VOLTAGE AND PHASE. 2. ONE WAY LENGTH OF WIRE OR CABLE - FT. (AWG) OR MTR. (SQ.MM) SELECTION 3. MULTIPLY BY 125% TO THE CALCULATED LINE CURRENT TO GET AMPACITY REFERENCE 4. LOOK OR SELECT THAT NEAREST RESULT TO ANY LOCAL CABLE SUPPLIER CATALOG OR NEC TABLES AND MATCH IT TO CORRESPONDING CABLE SIZE. 5. APPLY DERATING FACTORS - ALSO AVAILABLE TO NEC OR CABLE SUPPLIERS AND DEFINE THE FF: A. MEDIUM OF INSTALLATION - PVC OR RSC CONDUIT, CABLE TRAY OR CABLE LADDER OR TRUNKING, THROUGH, ETC. B. AMBIENT TEMPERATURE - INDOOR OR OUTDOOR? C. GROUP FACTOR - CONSIST OF CABLE SPACING AND DISTANCE TO WALL OR INSIDE CONDUIT INSTALLED IN TRAYS OR UNDERGROUND 6. APPLY DERATION IN WHICH RESULT IS LESS THAN ONE (1) TO THE PRE-SELECTED CABLE - THIS IS NOW YOUR ACTUAL FOR SELECTED CABLE 7. DEFINE REQUIRED OR ACCEPTED VOLTAGE DROP IN PERCENT VALUE 8. NOW USE THIS FORMULA: VDapp(APPLICABLE VOLTAGE DROP) = %Voltage Drop x Actual Voltage x 1000 divided by Derated Current x One Way Length x 100 9. THE RESULT WILL HAVE A UNIT OF -- mV/A.Mtr OR MILLIVOLT PER AMPERE-METER 10. NOW COMPARE IT TO AVAILABLE TABLES FOR VOLTAGE DROPS OF CABLES - IF IT IS LOWER THEN SELECT THE NEXT SIZE OR WHICH EVER MEET THE REQUIREMENT.

This answer is:
User Avatar

User Avatar

Wiki User

11y ago

You need the voltage drop per meter, from data on the cable, and then multiply by 500.

Alternatively find the resistance per metre of a single cable of the same wire size, from wire tables, then multiply by 2 x 500 x resistance (in ohms) x current (in amps).

This answer is:
User Avatar

User Avatar

Wiki User

11y ago

You need two more pieces of information: (i) what is the current being drawn, or the load in kVA, (ii) how thick is the cable. Then look up the wire resistance in ohms per meter for the cable, multiply by the length (500) and multiply by the current, then that is the voltage drop.

This answer is:
User Avatar

User Avatar

Wiki User

15y ago

You have to know the connected load amperage is at the end of the cable to do the calculation.

This answer is:
User Avatar

User Avatar

Wiki User

11y ago

This calculation can not be made. An amperage load at the end of the electrical run must be stated.

This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: How do you compute the voltage drop over a 500-meter underground cable if you have a 440-volt three-phase system?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

How to compute net sales?

How to compute net sales?"


What does compute in math?

Compute means to figure out the question and get an answer.


What does the math term compute mean?

compute means calulate


What is the present tense of compute?

the present tense of 'compute' will be 'computing'


What is the past tense of compute?

Computed is the past tense of compute.


Where is the biggest mountain range in Argentina?

im sorry but cannot compute So sorry but cannot computeim sorry but cannot compute So sorry but cannot computeim sorry but cannot compute So sorry but cannot computeim sorry but cannot compute So sorry but cannot computeim sorry but cannot compute So sorry but cannot computeim sorry but cannot compute So sorry but cannot computeim sorry but cannot compute So sorry but cannot computeim sorry but cannot compute So sorry but cannot computeim sorry but cannot compute So sorry but cannot computeim sorry but cannot compute So sorry but cannot compute


Write a java that computes the value of 2?

Compute means to calculate. What do you want to "compute", if you already know it is 2? If you want to show the value:System.out.println("Your number is " + 2);Compute means to calculate. What do you want to "compute", if you already know it is 2? If you want to show the value:System.out.println("Your number is " + 2);Compute means to calculate. What do you want to "compute", if you already know it is 2? If you want to show the value:System.out.println("Your number is " + 2);Compute means to calculate. What do you want to "compute", if you already know it is 2? If you want to show the value:System.out.println("Your number is " + 2);


When was Compute Against Cancer created?

Compute Against Cancer was created in 2000.


What values are needed to compute for work?

the values needed to compute for work , is W=FD


What is the plural noun of compute?

The plural noun forms of the verb to compute are computations and computers.


Origins of the word compute?

The word "compute" comes from Latin. See etymology in Answers.com.


How do you compute for the average speed of each athlete?

how to compute the average speed of each athlete