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StandardPower and earthingVersion 1.0

Power and earthing

Version 1.0, in force since 1 Mar 2026 · 8 rules that must be met

  • A + BFeeds to every rack
  • 80%Most UPS load
  • 15 minUPS runtime
  • 1Earth bond per rack

The must rules

8 rules every install follows, in the order of this page. 4 more rules are the default with a written exception.

The country's wiring rules always come first, and fixed electrical work is always done by a licensed electrician. These rules say what IT needs from the electrical design: which circuits, how the UPS is sized, how racks are earthed and where outlets go in rooms.

  1. Circuits and feeds
  2. UPS
  3. Earthing and bonding
  4. Power in rooms

Circuits and feeds

3 rules
MustHouse choice

Feed each rack from dedicated circuits that serve nothing else, labelled at the distribution board and at the rack.

Why
A kettle or a cleaner's vacuum on the same circuit trips the network.
How to check
The circuit schedule shows the rack circuits serve only the comms room; labels match on both ends.
MustHouse choice

Give every rack two power strips on two separate feeds (A and B), and plug each device with two power supplies into both.

Why
One failed feed, strip or power supply does not take a device down. The colours (black A, grey B) are in the colour standard.
How to check
Pull feed A during commissioning; everything with two supplies stays up.
ShouldHouse choice

Use metered, network-connected power strips on the management network.

Why
Monitoring sees the load per feed and warns before a circuit is overloaded; a strip can be read without a site visit.
How to check
Both strips report their load to monitoring.

UPS

4 rules
MustHouse choice

Size the UPS so the rack's total load is no more than 80% of its rating, including every switch's full PoE budget.

Why
PoE devices draw through the switch; a UPS sized for the switches alone is overloaded when the access points and video bars start.
How to check
The design's load sum and the UPS rating; the UPS's own load reading after commissioning is under 80%.
MustHouse choice

Give at least 15 minutes of runtime at full load, or enough to reach the building generator where there is one.

Why
Covers most short outages, and gives time to shut down cleanly in a long one.
How to check
The manufacturer's runtime chart for the installed load, and a timed test at commissioning.

Source IEC 62040

MustHouse choice

Connect the UPS's network card to the management network and send its alarms (on battery, battery fault, overload) to monitoring.

Why
A UPS nobody hears is just a battery that will fail quietly.
How to check
Pull the UPS input for 30 seconds during commissioning; monitoring raises an on-battery alert.
ShouldHouse choice

Schedule an automatic battery self-test each month and replace batteries at the manufacturer's service life.

Why
Batteries wear out without warning; the self-test finds a weak one before an outage does.
How to check
The UPS log shows a passed self-test in the last month.

Earthing and bonding

2 rules
Must

Fit a telecommunications earthing busbar in every comms room, bonded to the building's main earthing terminal.

Why
Gives racks, trays and shielded cabling one low-resistance path to earth, which protects people and equipment.
How to check
The electrician's test certificate lists the bond and its resistance.

Source ANSI/TIA-607-D, EN 50310

Must

Bond each rack and each run of metal cable tray to the busbar with its own labelled conductor; never chain racks through each other.

Why
A chained bond is only as good as its weakest joint, and removing one rack breaks the chain.
How to check
One conductor per rack at the busbar, labelled with the rack number.

Source ANSI/TIA-607-D

Power in rooms

3 rules
MustHouse choice

Put a double power outlet and the data outlets in a recessed box behind every wall display, inside the display's footprint.

Why
No cables hang below the screen, and the plugs stay reachable by lifting the screen off its mount.
How to check
The room's outlet schedule and a photo before the display is hung.
ShouldHouse choice

Do not put AV equipment on outlets switched by lighting or occupancy controls.

Why
Devices that lose power every night miss their updates and reboot during the first meeting.
How to check
Turn the room's lights off during commissioning; the video bar stays on.
ShouldHouse choice

Protect table boxes and floor boxes with surge protection where the building has none at the board.

Why
Laptops and devices at the table are the first to suffer from a surge.
How to check
The electrical design or the table box data sheet.

Sources

Public standards are named and summarised in our own words, never quoted. Most are sold by the bodies that publish them.
Public standardANSI/TIA-607-D, Generic Telecommunications Bonding and Grounding (Earthing) for Customer PremisesDescribes the telecommunications earthing busbar in each room, how it links to the building's main earth, and how racks and trays are bonded to it.Telecommunications Industry Association · checked 29 Sept 2026
Public standardEN 50310, Telecommunications bonding networks for buildings and other structuresThe European counterpart for bonding and earthing information technology equipment in buildings.CENELEC · checked 29 Sept 2026
Public standardIEC 62040, Uninterruptible power systems (UPS)The series covering UPS safety, electromagnetic compatibility and how a UPS's performance (including runtime) is specified and tested.International Electrotechnical Commission · checked 29 Sept 2026

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Viewing asAnna ByrneAV and IT delivery engineer · EMEA

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Goes to Sofia Reyes, Service manager, AV. Reviewed within five working days.