Rack PDU and power distribution
A PDU is what actually feeds rack-mount devices their power — but redundancy only pays off if the connected hardware has two power supplies to plug into it. This is how we plan PDU choice and feed redundancy honestly, without overselling it.
How we plan PDU and power feeds
Establish the load first
We total the connected devices' power draw before picking a PDU — the exact wattage and amperage always comes from the project's load calculation and the manufacturer datasheet, not a rule of thumb.
Decide simple or managed
A basic PDU is a multi-outlet strip; a managed one adds monitoring or remote outlet switching — the choice depends on whether remote visibility or control is actually needed.
Check whether the hardware can use redundancy
An A/B feed pair only protects equipment with dual power supplies — a single-PSU device gains nothing from a second PDU, so we check the gear list before recommending one.
Size and document the feed
Once redundancy needs are confirmed, we document the A/B path and PDU placement so the installing electrician can wire it correctly.
What honest PDU planning gets you
Two independent feeds, when it counts
In critical installations, two independent PDUs on separate power paths mean a single source or PDU failure doesn't take equipment down — but only for devices built with dual power supplies to use both.
Simple PDU: honest, sufficient, common
A basic multi-outlet strip is the right, sufficient choice for a small home or office network cabinet with no dual-PSU gear — we won't sell redundancy that hardware can't use.
Managed PDU: monitoring or remote control
A managed PDU adds visibility into load per outlet, or the ability to power-cycle a device remotely — useful when uptime or remote troubleshooting actually matters.
Redundancy needs dual-PSU hardware
An A/B feed pair only removes a single point of failure if the connected device has two power supplies plugged into the two paths — a single-PSU switch gains nothing from a second PDU.
Load sizing from the datasheet, not a guess
PDU wattage and amperage are always checked against the specific project's load calculation and the manufacturer datasheet — we don't quote a number until that's done.
A different concern from the panel upstream
The rack PDU is downstream power distribution for rack-mount gear; it's a separate topic from the electrical panel assembly standard that governs the distribution board feeding the rack.
What's in a PDU & power plan
A power plan an electrician can wire from, sized to the actual gear list.
- Connected-device load summary for the PDU decision
- Simple vs managed PDU recommendation with rationale
- A/B feed path documentation where redundancy applies
- PDU placement note within the U elevation
- Handover documentation for the installing electrician
Frequently asked questions
What's the difference between a simple and a managed PDU?
A simple PDU is essentially a multi-outlet power strip mounted in the rack. A managed PDU adds monitoring — visibility into load per outlet — or remote outlet switching, so a device can be power-cycled without a site visit. Which one you need depends on whether that visibility or control is actually useful to the project.
Does a second PDU always add redundancy?
Only if the connected device has two power supplies, one plugged into each PDU's feed. A single-PSU device draws from only one path, so a second PDU sitting next to it adds cost without adding protection — the redundancy benefit depends entirely on the hardware.
What is an A/B power feed?
It's two independent power paths — ideally from separate sources — each feeding its own PDU. A device with dual power supplies plugs into both, so a failure on one path or PDU doesn't interrupt power to that device.
How do we know what PDU wattage or amperage we need?
It depends on the project — the specific devices connected and their combined load. We calculate that against the manufacturer's datasheet for the chosen PDU model rather than quoting a fixed figure in advance.
Is a single PDU ever the right choice?
Yes, honestly — for a small home or office network cabinet with no dual-power-supply equipment, a single well-sized PDU is a sufficient and sensible choice. Redundant PDUs are worth the cost when uptime requirements and dual-PSU hardware actually justify it.
Plan your rack power distribution with us
Send us the connected-device list and uptime requirements, and our engineers will size the PDU and feed redundancy honestly — including telling you when a second PDU wouldn't help.