Engineering Documents · Free Template
24 V DC Power Supply Load List Template
List every 24 V DC load in a panel or cabinet with quantity and current. The sheet totals current and power and suggests a power supply rating with design margin.
Excel (.xlsx)Printable PDFFilled exampleFree, no sign up
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- How to Use sheet with steps
- Template sheet, blank and ready
- Example sheet, filled in
- 126 built in formulas
- A4 landscape print setup
- Works in Excel, Google Sheets and LibreOffice
Preview of the Filled Example
This is the Example sheet from the download, so you can see exactly how the completed 24 v dc power supply load list looks.
Panel / cabinetPLC panel CP 01
Nominal voltage (V)24
Design margin (%)25
RedundancyN+1, two 20 A modules
Loads
| No | Tag / item | Description | Qty | Current each (mA) | Total (mA) | Power (W) | Fuse / MCB | Continuous? | Remarks |
|---|---|---|---|---|---|---|---|---|---|
| 1 | PLC CPU | CPU and backplane | 1 | 800 | 800 | 19.2 | 2 A | Yes | |
| 2 | AI cards | Loop powered transmitters at 22 mA | 32 | 22 | 704 | 16.9 | 4 A | Yes | |
| 3 | DO cards | Interposing relays | 24 | 25 | 600 | 14.4 | 2 A | Yes | |
| 4 | Solenoids | Valve solenoids 2 W | 8 | 85 | 680 | 16.3 | 2 A | Yes | |
| 5 | Switch | Ethernet switch | 1 | 400 | 400 | 9.6 | 1 A | Yes |
Total current (A):3.18 · Total power (W):76.4 · Required rating with margin (A):3.98
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About the 24 V DC Power Supply Load List
Undersized 24 V supplies cause brownouts, resets and random trips. A load list with worst case currents and margin sizes supplies, fuses and redundancy correctly.
How to fill in this template
- List every load with quantity and current.
- Use worst case current, not typical.
- Set the design margin.
- Read the required supply rating.
- Select supplies and redundancy, and size fuses per circuit.
What the formulas do
- Total (mA) = quantity × current each.
- Power (W) = total (mA) × V ÷ 1000.
- Required rating = total current × (1 + margin).
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Frequently Asked Questions
Why 22 mA per loop?
Transmitters can drive up to about 21 to 22 mA on fault (NAMUR NE43), so the supply must cover it.
How much margin?
Commonly 20 to 30 % plus future spares.
Why 24 V DC?
It is safe to touch, standard for PLC I/O, and suits loop powered instruments.
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Learn more on the blog
Why 24 volts is used in PLC systems
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