Electrical Panel Dimension Calculator

Calculate panel dimensions from Single Line Diagram (SLD)

Key Factors

Switchgear size, form factor, installation type, cable termination position

Panel Types

Indoor/Outdoor, Front/Back cable termination, Single/Double door

Calculations

Width, Height, Depth based on IEC/NEC standards

Panel Configuration

Panel Type

Form Factor

Cable Termination

Switchgear Position

Max Panel Height mm

Switchgear Configuration

Calculation Results

Panel Dimensions

Width (mm)

Height (mm)

Depth (mm)

Panel Type --

Switchgear Count --

Total Power --

Cable Alley --

Panel Visualization

-- mm

Switchgear Dimensions Reference

MCB/MCCB Compartment Sizes (Horizontal Installation)

Switchgear Type	Rating (A)	Width (mm)	Height (mm)	Depth (mm)
MCB	≤ 63	300	275	300
MCCB	63-100	350	300	300
MCCB	125-250	350-400	300-350	300-350
MCCB	400-630	600	400	350-400
MCCB	800	600	600	700
MCCB	1250-3200	800	850	1000

ACB Compartment Sizes

ACB Rating	Width (mm)	Height (mm)	Depth (mm)
800A	700	800	800
1600A	800	800	850
≤ 3200A	800	850	1000
> 3200A	1400	1000	1200

Busbar & Cable Alley Sizes

Component	Position	Width/Height (mm)	Depth (mm)
Busbar	Horizontal	300-400	300
Busbar	Vertical	300-400	300
Cable Alley	Vertical	300-350	300

Calculation Formulas

Width Calculation

Formula: Total Width = Incoming Width + Busbar Width + Max(Outgoing Widths) + Cable Alley Width

Where:

Incoming Width: From switchgear table based on rating
Busbar Width: 300-400mm depending on current
Outgoing Width: Largest outgoing switchgear width
Cable Alley: 300mm (front) or 0mm (back)

Height Calculation

Formula: Total Height = Base(75mm) + Σ(Switchgear Heights) ≤ 2200mm

Constraints:

Maximum height: 2200mm for operation safety
Base frame: 75mm minimum
Multiple columns if height exceeds limit

Depth Calculation

Formula: Total Depth = Max(Incoming Depth, Outgoing Depth) + Cable Termination Offset

Where:

Outdoor panels: Add 100mm for double door
Back cable termination: Add 300mm
Take maximum depth from all switchgear

Example Calculation

Given: Incoming: 1250A ACB, Outgoing: 2×630A MCCB, 3×400A MCCB

Calculations:

Width: 800 + 300 + 600 + 300 = 2000mm
Height: 75 + (5 × 400) = 2075mm
Depth: 800mm (from incoming ACB)