DB Ampere Calculation

7/26/2019 DB Ampere Calculation

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P= VI cos

P= 240 (I) 0.85

I =P

240 x 0.85

Calculate for DB circuit breaker

Si!li"e# $! Calculatio%

&or si%'le !ase = k * 5 = $! re+uire#

&or tree !ase= k * ,.-4 = $! re+uire#

arket e*isti%' circuit breaker = -/,0/20/0/45/- $!

Cabli%'

Si%'le core cable 1co%sists of 5 cable e# / 3ello/ blue/ black/ 'ree%.

Double core cable co%sist 2 si%'le core

MCB main circuit breaker: to protect the cable.

MCB means Miniature Circuit Breaker -- it is used for upto

100Amps in the motor feeders.

MCCB menas Moulded case Circuit Breaker -- it is used for

25oAmps to 00Amps in the motor feeders.

!"CB means !arth "eaka#e Circuit Breaker -- it is used to

trip the Circuit breaker if an$ leaka#e fault occured means.

%CCB means %esidual Current Circuit Breaker -- A residual

current de&ice '%C()* or residual current

circuit breaker '%CCB)* is an electrical +irin# de&ice that

disconnects a circuit +hene&er it detects that the electriccurrent is not balanced bet+een the phase ',hot,) conductor

and the neutral conductor. uch an imbalance is sometimes

caused b$ current leaka#e throu#h the bod$ of a person +ho

is #rounded and accidentall$ touchin# the ener#ied part of

the circuit.


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All home electrical wires made in the U.S. follow standard color codes that identify each wire's function

in a circuit.

Knowing the electrical color code that dictates which wire does what is imperative not only in the correct

configuration of an electrical system, but it's also paramount for your safety.

Be aware that allelectrical wires, regardless of their function, could carry an electrical current at some point, so

treat all wires with equal caution. Also, highly rated electricians note that older homes, built prior to the 1940s,

might use different color codes if the wiring has never been upgraded.

Check out this detailed illustration that explains each wire's color and purpose:
http://www.angieslist.com/electrical/household-electricity.htmhttp://www.angieslist.com/electrical/household-electricity.htm


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Common color codes used in electrical wiring. (Illustration by Brandon Smith)

Black

Black electrical wire is used for power in all circuits. Any circuit's black wire should be considered hot or live.

Black wire is never used for a ground or neutral wire and should be used as the power feed for a switch or an

outlet. A black wire is often used in a circuit as a switch leg, the connection that runs from the switch to the

electrical load.

RELATED:Signs of Home Electrical Problems

Red

Red electrical wire indicates the secondary live wires in a 220-volt circuit, used in some types of switch legs and

in the interconnection between smoke detectors that are hard-wired into the power system. You can connect a red

wire to another red wire or to a black wire.

How to replace an electrical outlet

Blue and yellow

Yellow and blue electrical wires are also used to carry power but are not for wiring the outlets for common plug-in

electrical devices. These colors are used for the live wire pulled through conduit.

You'll use yellow mainly as switch legs to fans, structural lights and switched outlets. You'll use blue mainly as a

traveler for a three-way or four-way switch.

MORE:How Much Does It Cost to Rewire a House?

White and gray

White and gray indicate a neutral wire. White is the color most often used for this function. A neutral wire

connects to the neutral bus bar within an electric panel. (A bus bar is made of conductive metal that attracts the

electric current for distribution outward to feeders.)

You can connect white and gray only to other white and gray wires. Although neutral, they can still carry current,

particularly the unbalanced load the electricity not being used and being returned to the electrical service.

Green

Green indicates the grounding of an electric circuit. A green wire can connect only to another green wire and

should never connect to any other color wire. Green wires connect to the grounding terminal in an outlet box and

run from the outlet box to the ground bus bar within an electric panel.

The purpose of the green wire is to provide a path to ground for a circuit's electric current if a live wire within the

circuit happens to touch metal or some other conductive material. In the event of a fault, it could carry significant

current, so treat green wires cautiously.
http://www.angieslist.com/articles/what-are-signs-home-electrical-problems.htmhttp://www.angieslist.com/articles/what-are-signs-home-electrical-problems.htmhttp://www.angieslist.com/articles/how-much-does-it-cost-rewire-house.htmhttp://www.angieslist.com/articles/how-much-does-it-cost-rewire-house.htmhttp://www.angieslist.com/articles/what-are-signs-home-electrical-problems.htmhttp://www.angieslist.com/articles/how-much-does-it-cost-rewire-house.htm


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If you're apprehensive about dealing withelectrical wires in your home,search Angies List fortop-rated

electriciansin your area.

Have you faced a wiring problem in your home? Share your thoughts and concerns in the comments

section!

Editor's note:This is an updated version of an article originally published on Aug. 25, 2011.

June 15, 2015

By Angie's List Staff

Comments

Confusing wiring colors

Tony | Nov 14,2015 5:38PM

I'm installing a Home Deot !eiling "an# I'm !on"$se% &e!a$se I only ave 3 !olo(e%

o" )i(e# *(ey, )ite, an% &a(e !oe(# Te iss$e is te g(ey an% )ite a(e !onne!te%

to get e( )it )i(e n$ts an% te g(o$n%s a(e all tigete(# My ne) "an as a )ite

)i(e , &la!+ )i(e an% a g(een )i(e# I +no) te g(een goes )it te &a(e !oe(, &$t

o) %o I i!+ )i! g(ey an% )ite ai( "(om te !eiling %o I !onne!t te to te "ans

&la!+ )i(e o( )ite )i(e to )i! g(ey an% )ite

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Oven

steve | Nov -,2015 5:15PM

I am (ela!ing an ol% oven,# Te ne) oven as .e%, *(een, /la!+# Te so$(!e as

.e%, *(een, /la!+, an% ite# Do I !a te )ite an% !onne!t te ote(s !olo( to

!olo( I t(ie% tis an% it seeme% to )o(+ &$t I am esitant to !lose it all $ $ntil I am

s$(e it is (igt#

(elyToy Wires

ami | Nov 3,2015 :3M

I'm %oing a s!ool (oe!t, an% I nee% to +no) )at !olo(s )i(es mean in toys# Nee%

it )itin %ays6

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4-H DPA Project

*i(ly *i(l | 7!t 28,2015 8:31PM
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6/7

Hi# I am on "i"t g(a%e an% I am %oin DP "o( 4H# I %i% ele!t(i!le )i(ing an% I nee%

simle %e"initions "o( te &la!+ )i(e, )ite )i(e, an% &a(e )i(e#

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Thermostat wireDale | 7!t 11,2015 10:30M

I ave a te(mostat tat as lette(s "o( "(om to to &ottom . 9 I ave only 2 )i(es

!oming "(om te )all, a (e% an% yello), te(e is also a g(een st$!+ into te )all not

$tilie% )en I oo+ te ( to ( an% y to y te "$(na!e !ontin$es to ($n any i%eas

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Im guessing these are

/(yan | 7!t 28,2015 1:22PM

I'm g$essing tese a(e (o&a&ly lo) voltage te(mostat )i(es tat !ome "(om te

eate(, an% not "(om a o)e( so$(!e# 9o$ nee% t)o )i(es to !omlete a !i(!$it

voltage an% a (et$(n at# Te (e% an% yello) )i(es (ovi%e te !i(!$it loo tat is

nee%e% to (ovi%e lo) voltage o)e( "o( te te(mostat to oe(ate#

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!orch an" garage lights;eane 7sita | 7!t 10,2015 :55PM

I'm (ela!ing te o(! an% ga(age ligts# Te )i(es !oming o$t o" te o$se a(e (e%,

)ite an% yello)# Te )i(es on te "i


7/7

.on | 7!t 4,2015 :14M

I (ea% eve(yting a&ove )it g(eat inte(est# Ho)eve(, my sit$ation seems %i""e(ent# I

am $tting a ne) "emale an% on an e

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DB Ampere Calculation