How To Wire Together With Install 3-Phase Electrical Panel [Part #1]

How to gather an electrical Panel for three stage Motors?, How to Wire in addition to Install 3-phase Electrical?

To live able to operate an Electro motor (Electric Motor) three phase, of course, a Panel is needed which functions every bit a motor command oculus thus that it tin live operated easily, safely in addition to equipped alongside practiced protection.

Electric Motor Control Panel three Phases are unremarkably placed on 1 principal panel in addition to tin live used for the functioning of several Electric Motors, panels for several Electric Motors are commonly called MCC (Motor Control Center).

Then, How to Wire in addition to Install 3-phase Electrical?

"Complete Guide" How to Assemble 3-Phase Electric Motor Panels

How to Wire in addition to Install 3-phase Motor Panel [Part#1]

How to gather an electrical Panel for  How to Wire in addition to Install 3-phase Electrical Panel [Part #1]
Learn how to Panel wiring in addition to Making
For those of y'all who desire to acquire how to gather a three Phase Electric Motor Panel, thus that it is easier to understand, nosotros volition dissever into several stages to live able to gather a three stage Electric Motor Panel.

1. Power of 3-Ph Motors
The commencement pace that nosotros must know inwards advance earlier assembling a three stage Electric Motor Panel is how much the three Phase Electric Motor Power volition live controlled yesteryear the Panel.

This is real important, to live able to create upward one's heed the components that nosotros volition laid upward to brand the Electric Motor Panel.

In addition, the Power (KW) of an Electro Motor determines what circuit nosotros volition brand for the Starting Motor System.

Starting Motor System
Some of the starting systems of the three stage Electric Motor are adjusted to the size of Motor Power, including:
  • Electro Motor alongside a ability smaller than 5.5 kw using the Starting Direct On Line (DOL) system.
  • Electro Motor alongside a ability of 5.5Kw to 22Kw using the Starting organization "Star Delta".
  • Electro Motor alongside Power 22Kw to 150Kw using the Starting System "Auto Transformer".

For example: If nosotros desire to create a 5.5Kw Motor Panels, the Panel nosotros volition occupation uses the Direct On Line Circuit (D.O.L), in addition to this circuit is the simplest series.


2. Panel Components
After nosotros honor out that the Electro Motor that nosotros are going to brand the Panel is 5.5KW Electro Motor, in addition to the required circuit is Direct On Line Starting system, thus nosotros must thus create upward one's heed the Materials (Components) needed to brand the Direct On Line circuit Panel, including:

Required Panel Components:
  • Panel Box
  • Power Cable from Panel to Motor
  • Power Cables for Circuits within the Panel
  • Cable for command circuit within (Wiring) Panel
  • MCCB
  • MCB
  • Magnetic Contactor
  • Timer (For D.O.L Circuits do non occupation a Timer)
  • Thermal Overload Load (TOR)
  • Pilot lamp
  • Push Button
  • Ampere Meter
  • Current Transformer (C.T)
  • Cable shoe
  • Heat Shrink
  • Cable Wrapping

3. Components Size
After nosotros honor out what components are needed for the industry of a three stage electrical Motor Control Panel, thus create upward one's heed the type in addition to size.

The almost of import affair nosotros know earlier determining the size of diverse Components is to calculate Nominal Current (In) from an Electro Motor that the Panel volition make.

Calculating In (Nominal Curret)

In = P : (V x PF x √3)

In: Nominal Current (Amperes)
P: Power (Watts)
PF (Power factor) 0.80 or adjust to the specifications of Motor.

For example: If the Electro Motor Specifications used are 5.5Kw (5500Watt), 380Volt, Cosphi 0.8, thus the Nominal Current is:
  • In = P: (V x PF x √3)
  • In = 5500 Watt: (380Volt x 0.8 x 1.73)
  • In = 5500 Watts: 525.92
  • In = 10.45 Ampere.
After nosotros know the 5.5Kw Electro Motor, has a Nominal Current (In) of 10.45 Ampere, thus nosotros volition thus create upward one's heed the Size of the Panel Components that nosotros volition prepare.


Panel Box
If nosotros are going to gather the Motor Panel on an MCC that is already available, thus nosotros no longer withdraw to supply a Panel Box, but if nosotros are going to gather a novel Panel in addition to solely for 1 Motor panel, thus nosotros tin adjust the Box Panel Size alongside how many Components volition nosotros assembled, for a 5.5Kw motor D.O.L system, the panel size is non besides large, plenty alongside a size Panel Box 30cm x 40cm x 20cm, in addition to if nosotros are going to install this panel exterior the Room, thus select Outdoor type Panel alongside IP65 .


Power Cable from Panel to Electro Motor
Type of cable is adapted to the cable installation, if the cable is planted inwards the soil tin occupation NYRGbY or NYFGbY cable, or if installed inwards a higher house (inside the cable tray) tin occupation NYY cable.

Next, is to create upward one's heed the size of the cable to live used, how to calculate it is:

In x 125% (Safety Factor), thus the results are adjusted to the Current-Carrying Capacity.

For example: 5.5Kw Electro Motor has a Nominal Current is 10.45 Ampere, then:

10.45 Ampere x 125% = 13.06 Ampere.

Then nosotros come across inwards the Cables Current-Carrying Capacity Table, the size of the Power Cord for Current is 13.06A, if the value of 13.06A is non inwards the table, nosotros tin occupation the closest size, which is 18A, alongside a cable size of 1.5mm².

For example: The Power Cable required for Electro Motor 5.5 Kw, is:
  • NYY four x 1.5mm² cable (Air Network)
  • NYRGby Cable four x 1.5 mm² (in soil).

Power Cable inwards the Panel
to Wire in addition to Install 3-phase Electrical Panel, of course of educational activity nosotros withdraw a Power Cable that volition live used for connecting from MCCB to Magnetic Contactor, to Overload Relay, in addition to thus on.

The cable commonly used for Power inwards the Panel is the NYAF Cable Type.

Cable size is adjusted to the In (Nominal Current), if the Electro Motor used is 5.5KW alongside In 10.45, thus the agency to create upward one's heed it is the same every bit determining the Size of the Power Cable to the Electric Motor.

So, the cable used is 1.5 mm NYAF cable, in addition to the cable length is adjusted to the needs of the panel circuit.

However, to create upward one's heed the Power Cable for Magnetic Contactor on the Star Delta Circuit, it tin occupation a 1/2 size of the Power Cable from the MCCB.

Cable for Control (Wiring) circuit
Cable for command circuit (Wiring), using NYAF cable alongside a smaller size, tin occupation NYAF 0.75mm cable, because the electrical flow flowing on this command cable is solely for turning on Magnetic Contactor, Pilot Lamp, Relay, Timer, non for Power Motor .

Cable Length is adjusted to Requirement, Cable length for fewer DOL series, compared to command Cable for Star Delta in addition to Auto Trafo circuits.

MCCB
MCCB (Molded Case Circuit Breaker) is a Component Panel that functions every bit a circuit breaker / connecter from Source (Power) to the side yesteryear side panel components, in addition to also functions every bit a security when in that location is overcurrent in addition to Short Circuit.

To create upward one's heed the size of the MCCB on a three stage Electric Motor Panel, the method is:

Size of MCCB = In x 125%

For example: If the Electro Motor used is 5.5 Kw, thus the Nominal Current is: 10.45 Ampere, in addition to to create upward one's heed the size of the MCCB for the Panel are:

Size of MCCB = In x 125%
MCCB size = 10.45A x 125%
MCCB size = 13.06A
Because the size of MCCB 13.06A is non available, nosotros tin occupation MCCB alongside a size that is to a greater extent than or less or slightly larger, namely MCCB 15A

MCB
MCB (Miniature Circuit Breaker) is an overcurrent security device, in addition to on the panel is used for security command panel circuit (Not for ability motors), thus the size of the MCB needed does non withdraw to live besides large, for the command needs Panel tin unremarkably occupation MCB four Ampere.

Magnetic Contactor
Magnetic Contactor is 1 cistron of an electrical panel that functions similarly to a switch, namely to connect or disconnect the Current of electricity, alongside a magnetic working principle.

Magnetic Contactor used to gather a three stage Electric Motor Panel has diverse types in addition to sizes.

For the principal electricity trouble (power), also called "Line", y'all tin occupation Magnetic Contactor which has three "Line" Terminals of NO (Normally Opened) type, in addition to additional terminals (Accessories) for command 2 NO terminals in addition to 2 NC Terminals (Normally Clossed).

Also brand sure also how much Voltage for Coil is on Magnetic Contactor, because Coil on Magnetic Contactor in that location are several types of Voltage, in that location are Coil 220V, 380V, 24Vdc, 42Vac, etc., adjust the Voltage of Magnetic Contactor Coil alongside the Control Voltage y'all occupation on the Panel in addition to unremarkably the panel uses 220V voltage for the Control circuit.

Determining the size of a Magnetic Contactor for the DOL Series:
Next to create upward one's heed the size of the Magnetic Contactor inwards accordance alongside the Electro Power of the motor used, for the DOL circuit solely requires 1 Magnetic Contactor, in addition to the formula for determining the Magnetic Contactor Size is the same every bit determining the size of the MCCB, namely:

Magnetic Contactor (DOL Circuit) = In x 125%

For example: If the Panel that nosotros are going to brand for a Motor is 5.5 Kw (DOL Circuit), thus the size of the Magnetic Contactor is:


  • Magnetic Contactor = In x 125%
  • Magnetic Contactor = 10.45A x 125%
  • Magnetic Contactor = 13.06A

Because the size of Magnetic Contactor 13.06A is non available, thus nosotros tin occupation a Magnetic Contactor alongside a size that is to a greater extent than or less or slightly larger, for event tin occupation Magnetic Contactor LC1-D18 (or its equivalent).

Remember: The larger the size of the Magnetic contactor than the In (Nominal Current) motor volition live better, but for certain non economical.

Determine the size of the Magnetic contactor for the Star Delta Series:
Unlike the DOL Series which solely uses 1 Fruit Magnetic contactor, on the Star Delta Series nosotros occupation three Magnetic contactors whose functions are:

2 Magnetic Contactors for Line (Power conduct to the Motor)
1 Magnetic Contactor for Star (Only for connecting the Cable to the Motor terminal inwards Star / Star, in addition to non to live supplied yesteryear Electricity from the Source).

Determine the size of Magnetic Contactor for Line (Star Delta Series):

Magnetic Contactor (Line) = In: √3

Determine the size of Magnetic Contactor for Star (Star Delta Series):

Magnetic Contactor (Star) = In: 3

For example: We volition gather a Panel for a 22Kw Electric Motor (22000Watt), thus the starting organization circuit that volition live made is the Star Delta Circuit, the magnetic contactor needed is:
  • In = P: (V x Cosphi x √3)
  • In = 22000: (380V x 0.80 x 1.73)
  • In = 22000: 525.92
  • In = 41.83 Ampere
Magnetic Contactor Size for Line = In: √3
Magnetic Contactor Size for Line = 41.83A: 1.73
Magnetic Contactor Size for Line = 24.17 Ampere
Because the size of the Magnetic Contactor 24.17 Ampere is non on the market, thus nosotros tin occupation a Magnetic Contactor alongside a size that is to a greater extent than or less or slightly larger, for event using Magnetic Contactor Mitsubishi SN-25 (Or Equivalent).

Magnetic Contactor Size for Star = In: 3
Magnetic Contactor Size for Line = 41.83A: 3
Magnetic Contactor Size for Line = 13.94 Ampere
Because the size of the 13.94 Ampere Magnetic Contactor is non on the market, thus nosotros tin occupation Magnetic Contactor alongside a size that is to a greater extent than or less or slightly larger, for event using Magnetic Contactor LC1-D18 (Or Equivalent).

Remember: The bigger the size of the Magnetic contactor than the In (Nominal current) motor, the better, but for certain non economical.

TIMER RELAY
To gather the motor panel alongside the organization starting using the Direct On Line (DOL) circuit, no timer is needed.

The timer is used for the starting motor organization alongside the Star Delta Circuit in addition to the Auto Transformer System.

For Motor Panel Circuits alongside the Star Delta system, it requires 1 Timer, alongside a fourth dimension setting of betwixt 4-5 seconds or depending on the application of the Motor installation inwards the field.

For a serial of motor panels alongside an Auto Transformer system, it requires a lay out of timers, according to your needs, in addition to how many steps to movement the Auto Transformer.

For the three Step Auto Transformer circuit, occupation 2 Timers
For the four Step Auto Transformer circuit, occupation three Timer
and the settings of each timer, tailored to the needs of the application inwards the field

Thermal Overload Relay (TOR)
Thermal Overload Relay is 1 cistron inwards the industry of three stage electrical motor panels, in addition to serves every bit protection (safety) when in that location is overcurrent, to protect the motor from impairment due to overload.

Determining size of Thermal Overload Relay for Direct On Line Motor Panel.
To create upward one's heed the Thermal Overload Relay size that nosotros volition occupation to gather an Electric Motor Panel, nosotros should commencement know how much it should live Overload Settings for security Overcurrent on an Electric Motor (DOL Circuit)

Setting of Thermal Overload relay = In x 80%

Why is the setting smaller than the Nominal Current?
Motor Nominal Current is a large restrain of the highest electrical flow when the Electro Motor is operated, in addition to is non recommended for continuous use.

If an Electrical Motor is operated continuously at maximum load, alongside a electrical flow value equal to or to a greater extent than or less the In (Nominal Current) Motor, it volition crusade the Motor temperature to growth in addition to tin crusade impairment to the insulation of the Rolls, in addition to lastly the Motor is damaged (Short coil).

Therefore, it is improve that the Overload setting is smaller (80%) than the large In (Nominal Current) Electric Motor, to popular off along the Motor from existence operated beyond the Nominal Current, in addition to popular off along Normal.

After nosotros know the Thermal Overload setting for Electro motor safety, thus nosotros tin thus create upward one's heed the size of the Thermal Overload nosotros volition use.

For example, for a 5.5KW Motor Panel, the nominal electrical flow is 10.45A, in addition to the recommended Overload setting is:

10.45A x 80% = 8.36 Ampere.

Next nosotros tin create upward one's heed the Overload Size which has a middle value of 8.36 Amperes. For example, y'all tin select 7-9A Thermal Overload Relay.


Determining the Size of the Thermal Overload Relay for Star delta motorPanel
Before Determining the Size of Thermal Overload for Electric Motors Star Delta Circuits, nosotros commencement create upward one's heed the Overload relay settings for the Star Delta Circuit, namely:

Setting of Thermal Overload Relay = 1/2 x In x 80%

For example: Settings for Thermal Overload Relay for 22Kw Electric Motor Protection, alongside the Star Delta circuit, are:

In 22Kw motor = 41.83A

Setting Overload = 1/2 x 41.83A x 80% = 16.73A

Next nosotros tin create upward one's heed the Size of Overload which has a middle value of 16.73 Ampere. For example, y'all tin select Thermal Overload Relay 12-18A.

In addition, to create upward one's heed the size of the Thermal Overload Relay for the Star Delta Circuit Protection, y'all tin also occupation formulas such every bit determining the size of the Thermal Overload Relay DOL circuit, alongside the installation seat weather condition Thermal Overload placed on the Power Cable (Line) later MCCB (Before the Magnetic contactor Line) .



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