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Can you apply a 5 percent voltage drop on a 600 meter run to reduce your cable size?
Wiki User
∙ 14y ago
This depends upon your application. What is the tolerance of the end device? In other words what is the manufacturers specified Voltage range? The % of voltage drop as given in the NEC is a FPN (Fine Print Note) and is therefore a recommendation and not a code requirement. Some States however will specify the allowable % of voltage drop as part of their rules. Typically they will follow the NEC FPN which is 3% for a branch circuit and 5% total for feeder and branch circuit. So if you are running a 240V line 600m you should only have 5% drop (12V) from the service to the end device/equipment. If 228V is within the allowable operating range of the equipment/system it feeds then that is acceptable.
Wiki User
∙ 14y ago
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How do you reduce induced voltage in control cables?
You can reduce induced voltage in control cable by applying the following methods. 1. While laying control cable keep a minimum distance 300mm from the power cable. 2. If possible try to lay control cable on the separate cable tray. 3. Earth the Armour/ screen of the control cable on both side of the cable or at-least at one side. Some times it is not important to reduce the the induced voltage in control cable, but it's effect on relay or contactor as the contactor or relay does not pick-down even after the removal of the control supply. In that case it is recommended to use two relay/contactor in parallel and use the contacts in series or parallel for control circuit interlocking.
Why the cables are twisted?
This helps reduce electromagnetic interference. One side of the cable may be nearer the source; if the cable is not twisted, the effects may accumulate. If it is twisted, the pattern alternates between voltage in one direction, and voltage in the opposite direction, so the interference will be cancelled, not completely, but to a great extent.This helps reduce electromagnetic interference. One side of the cable may be nearer the source; if the cable is not twisted, the effects may accumulate. If it is twisted, the pattern alternates between voltage in one direction, and voltage in the opposite direction, so the interference will be cancelled, not completely, but to a great extent.This helps reduce electromagnetic interference. One side of the cable may be nearer the source; if the cable is not twisted, the effects may accumulate. If it is twisted, the pattern alternates between voltage in one direction, and voltage in the opposite direction, so the interference will be cancelled, not completely, but to a great extent.This helps reduce electromagnetic interference. One side of the cable may be nearer the source; if the cable is not twisted, the effects may accumulate. If it is twisted, the pattern alternates between voltage in one direction, and voltage in the opposite direction, so the interference will be cancelled, not completely, but to a great extent.
Will voltage drop over cable distance?
If the voltage is supplying any current through the cable, i.e. if there is any 'load' at the end, then the voltage will drop through the cable.
What effect does it have on the voltage drop in an electrical cable if the resistance of the cable is decreased?
It will decrease the voltage drop.
What is voltage grade of cable?
Voltage Grade of cables specifies the safe voltages which the insulation of the cable can withstand.
What is an LT cable?
An LT cable is a low tension (or low voltage) cable.
Why drop voltage in xlpe cable is more than PVC cable?
The voltage drop in a wire has nothing to do with the insulation. Voltage drop has to do with the cross sectional area of the wire.
How do you find cross sectional area of cable when you have the lent current and the voltage drop?
cross sectional area of cable * voltage drop
Does the device or cable determine the voltage on a slow cooker?
The voltage is always determined by the device. (in this case a slow cooker).However, having established what voltage to supply to the device, the cable must be suitable for the voltage used. Everything in the chain of power transmission, must be rated for the correct voltage. Cables, plugs, fuses etc.
What is voltage drop when utilized with cable runs?
A: ANY CABLE will have a definite impedance and if current flow there is going to be a definite voltage drop because of it
How do i tell the voltage of my lawn tractor battery?
You will need a voltmeter. Hook the red cable to the + post and the black cable to the - post and it will show the voltage.
How do you calculate voltage drop for 6.6 kv whose length is 3000m load is 1 MW?
THIS CONSIDERATIONS SHOULD BE STRICKLY FOLLOWED: SOUND ENGINEERING AND ACCEPTABLE ECONOMICS; 1.DEFINE DEMAND LOAD - BASED ON ACTUAL SYSTEM VOLTAGE AND PHASE. 2. ONE WAY LENGTH OF 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 MEDIUM VOLTAGE CABLE SUPPLIER CATALOGUE 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 - TRANSMISSION TOWER, 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.
