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Get yourself a copy of the National Electrical Code

Get yourself a copy of the NEC for reference or you may ask the local utility company in your area.

1. make a load schedule for a three phase distribution panel
2. distribute the single phase load equally on the phases A,B,C
3. Add the total current for eache phase
4. select the biggest current...

full load current x250%

You don't seems to understand the question ask... technically if load are balance in a 3phase system the current in the neural is zero amps... if the load is purely L-N there is a tendency that...

Our system voltage is 380/220, 3phase 4wire. If I have a load of purely 220 single phase connected to L-N on a distribution panel 380/220 with solid neutral, do I have to increase the size of the...

From your triangle formula apparent power is your KVA, true power is your KW and your reactive power is your KVAR.

How can we protect ungrounded system from single line to ground fault.. any suggestion??

Does this mean that after a cb is trip on earth or line to line fault it is not allowed to swith on again after clearing the fault?

Any body who knows the standard on the number of maximum operation of a circuit breaker under a fault condition?

14KAIC this meas that your CB is capable to handle 14kiloampered fault current with out damging your cercuit breaker..

Yes I connected a three phase load but same result. Somebody advise me to ground the neutral on the primary side but there is no neutral bushing in the primary..

I energize a Y-Yn transformer 13.8kv/380/220. At no load
all line to line voltage at the secondary were 380v but L1-N=215, L2-N=209 and L3-N=218 any one can explain me what is the cause of these...

RMUs are used in uderground loop system comprising of two load break sws and one fuse sw. they are installed outdoor or indoor..

Why do we have to convert ac transmission lines to dc voltage to cross under water using marine cables.

use your power formula

p=srt3EI for 3ph
p in kva
I in Amps
E v in the secondary

What is the different between inrush current and starting current?

Ihave a capacitor bank connected to my main switch gear. My distribution panel is coupled with a stand by genset through ats. Is there any effect on the genset during the change over of supply from...

have heard about the steinmetz circuit? Try this it might work.

SINGLE PHASE SUPPLY TO RUN 3PH MOTOR

Operation of three-phase Motors in single-phase supply Induction motors with a three-phase...

I have two source one from the utility company and stand by genset. And it is coupled through electrical inerlock ATS. My main breaker is connected with a capacitor Bank. Is there any effect on the...

check the price of the above mentioned phase converter it migth be more cheaper buying a single phase 2hp motor or trade-in your old 3ph motor with single phase motor.

Consult your local electrical code or the Natilnal Elecrical Code.. or your cable manufacturer's manual

Hey guys the question above still stands!! Any suggestions??

The capacity of a electrical equipment to sustain mechanical stress usually caused by lightning srike.

From your power angle formula you can size your capacitor depends upon how much power factor you are going to correct..

This is just like the question.. WHAT KILL'S? THE CURRENT OR THE VOLTAGE?

Any one have a conversion table in refrigeration?
Tons to hp..
Ty.

MVA fault Rating.. How this Fault rating is Calculated?

Balance your load on your distribution panel.. check your single phase load if they are distributed equaly to each phase A, B, and C. Compute the load for each phase they should be equal or nearly...

This is a self explanatory the larger your motor the higher the current...

There are many condition to be met in sizing up your transformer to start up a 50hp 3phase ac motor.

1. the starting kva of your motor. (per NEMA code Letter Designation)
2. the voltage sag...

As per your NEC




As per NEC tabel on Allowable Ampacities of single insulated conductor from size 2.0mmsq up to 500mmsq these conductors are rated FRom 0 to 2000V.. please refer to your NEC...

VFD is a big contributor of harmonics that causes CB tripping, relays or PLC disturbance. Install a passive harmonic filter it will improve your hamonic level as well as impromving your power factor.

Usually low voltage cables are rated up to 1000v.. so there is no question whether you use it in 110v or 220v

Short circuit calculation..
1. compute the PU (per unit ) value of utility source (puZs)
puZs=kva base/utility Short Circuit KVA

2. Compute PU for Tranformer Source (puZt)
puZt = % Z of...

In transmitting Electrical Energy 3phase system is more economical than single phase system

For your safety better consult a qualified electrician for the job.. remember a little knowledge is dangerous.. how much more if you know nothing about how things work!!

In addition if we talk of volatage rating of a cable it refers the insulation.. but if we talk about the cross sectional area it refers to its ampacity..

Yes mr cho I agree with you.. but if you are going to improve the pf of a certain industrial plant you have to use the power triangle formula... to determine the size of your capacitor bank to be...

In addition it is the capacity of an equipment to withstand mechanical stress.. like lightning strike without causing any damage to the equipment...

What I mean is DC short circuit current calculation.. we use to do AC short circuit current calculation but for DC I think it has different parameters...

If your motor is three phase interchange any of the two terminal from the source

I don't have buck-boost transformer. How about connecting my motor in parallel wye from the motor terminal? Is it possible?

Any one familiar with DC short circuit calculation?

I have 15hp 3phase motor rated 460/230V how can I run my motor if my supply voltage is 380v 3phase...

As long as you have the correct rating, as simple step down transformer will do.. 120/240

You Can Also Consult Your Nec For Your Wire Ampacities And Sizes Of Your Conduit...

This confuses me... sometimes it is called grounding and sometimes it is called earthing.. can anyone explain further... which is which?
Thanks.

What is more effective in industrial application.. the HRG (high resistant grounding) system or the low resistant grounding system?

Check with your utility company what supply it serve you..