1. Calculate Size of Bus bar & Panel Design

CALCULATE DIMENSION OF ELECTRICAL PANEL FROM SLD

INTRODUCTION:

In Designing Stage , We need to calculate approximate Dimension of Electrical Panel to conclude Dimension of Electrical Room and Total Space requirement of Electrical Services. * Dimension of Electrical Panel’s is calculated from Electrical SLD. * Dimension of Electrical Panel mainly depends on

Size of Main Incoming and Outgoing Circuit Barker. 2. No of Outgoing Circuit Breakers. 3. Panel’s Form Factor. 4. Type of Panel (Indoor / Outdoor). 5. Cable connection in Panel (Front Side / Back side of Panel). 6. Installation of Circuit Breaker (Horizontal / Vertical) 7. Height of Panel should not be more than 2200mm Due to Operation of Upmost Switchgear.

GENERAL SWITCHGEAR ARRANGEMENTS IN PANEL

There are four compartments in Electrical Panel.

Incoming Section 2. Outgoing Section 3. Busbar Chamber 4. Cable Alley.

FACTORS TO BE CONSIDERED TO CALCULATE DIMENSION OF PANEL:

Dimension of Panel mainly depends on following factors.

TYPE OF PANEL (INDOOR / OUTDOOR):

Depth of Panel is depending on Type of Panel. * If We have Indoor Type of Panel and there are no any issue regarding Water seepages near Panel than Double Door type of Panel is not required. * In Out Door Type Panel construction is mostly Double Door Type. * For Double Door Construction required more 100mm Panel Depth than actual .

FORM FACTOR OF PANEL:

Type of Form Factor decide Dimension of Panel. * For Same type and same rating of Switchgear Form 1 required less space compared to Form 2A, 2B, 3A, 3B, 4A, 4B.

POSITION OF SWITCH GEAR INSTALLATION

Panel’s Width and Height mostly depends on Position of Switchgear Installation. * If we installed Switchgear in vertical Position than Height of Panel is increased. * If we installed Switchgear in horizontal position than with of Panel is increased. * Most of manufacture prefer Horizontal position of Switchgear to easy termination of Incoming and Outgoing of Switchgear to Busbar.

HEIGHT OF PANEL

Height of Panel should not more than 2200mm for easy operation of upmost Switchgear in Panel. * This 2200MM height concert increase width of Panel if we have multiple number of outgoing.
If we have 5 Nos of outgoing than it may require one No of Colum Section of Panel (400×5=2000mm).
But if we have 8 No’s of outgoing than we required two no of Colum Section in one Section 4 no of Outgoing Switchgear and in second Colum section for 3 no of Switch gear. 1 no of More cable alley section (300mm) required for cable termination.

CABLE TERMINATION IN PANEL (FRONT SIDE / BACK SIDE)

Front Side Cable Termination: If We Installed Panel In front of wall than Panel Back Side is not accessible hence We need Cable Termination on front side of Panel for this we need Cable Alley of 300mm for Cable Termination. * This arrangement increase width of 300mm for panel but depth of panel will not increase. * Back Side Cable Termination: If We Installed Panel at some distance from wall than Panel Back Side is accessible hence, we may do Cable Termination on back side of Panel for this arrangement we need more 300mm depth for Cable Termination. * This arrangement will not increase width of panel but depth of panel will not increase 300mm.

GENERAL COMPARTMENT SIZE FOR VARIOUS SWITCHGEAR IN PANEL.

SIZE OF MCB / MCCB COMPARTMENT (CABLE CONNECTIONS ARE IN FRONT OF PANEL)

MCB / MCCB Size

Position

Width (mm)

Height (mm)

Depth (mm)

Up to 63A

Horizontal

300

275

300

63A to 100A

Horizontal

350

300

125A to 250A

Horizontal

350 to 400

300 to 350

400A to 630A

Horizontal

600

400

350 to 400

MCCB 800A

Horizontal

600

700

MCCB 1250A to 3200A

Horizontal

800

850

1000

Cable Connections are in front side of Panel, If Cable Connection are in Back Side of Panel add 300mm in Depth of Panel
Cable Termination Space in Panel (From Cable Entry at Panel to Termination Location) Up to 800A =more than 400 mm, above 800A It should be more than 800mm.

SIZE OF ACB COMPARTMENT (CABLE CONNECTIONS ARE IN FRONT OF PANEL)

ACB Size

Position

Width (mm)

Height (mm)

Depth (mm)

800A

Horizontal

700

800

1600A

Horizontal

800

850

ACB up to 3200A

Horizontal

800

850

1000

ACB Above 3200A

Horizontal

1400

1000

1200

For Cable Entry from Bottom of Panel=Min 700mm Height from Bottom to Cable Termination

Cable Termination Space in Panel (From Cable Entry at Panel to Termination Location) Up to 800A =more than 400 mm, Above 800A It should be more than 800mm.

SIZE OF SFU COMPARTMENT (CABLE CONNECTIONS ARE IN FRONT OF PANEL)

SFU Size

Position

Width (mm)

Height (mm)

Depth (mm)

125A

Horizontal

400

350

300

200A

Horizontal

400

350

300

200A

Horizontal

400

300

Cable Connections are in front side of Panel , If Cable Connection are in Ba…