Power Modules

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What can I charge using a usb charger in a power module?

USB power supplies (chargers) are available with different current ratings. From 1 amp per socket to 2.5 amp. Most of these are 5 volts (the standard for USB devices).

Thus a 2 amp USB socket, at 5 volts will deliver 10 watts of power (2A x 5V = 10W)

The I pad uses a 10 watt charger as standard. While mobile phones tend to use c 5 watt.

However if a mobile phone was charged using a 10 watt supply it would charge more quickly and not be detrimental to the battery.

Similarly an I Pad would be best charging in a 2A, 5V USB but could also charge in a 1A, 5V USB but would take longer to charge.

With regard to USB charging of laptops or computers this is different story.

Laptops need around 3A, 20V to give 60W – this is not available through USB but could become available over time with next generation USB type C developments.

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Why can’t I just use a cheap extension lead to power my desk equipment?

There are British standard guidelines for installation of electrical systems into office furniture, this is BS 6396: 2008.

The basic rules that apply when installing power into a desk are as follows:

  • Sockets used to power desk equipment should be individually fused sockets (not available on retail standard extension lead type sockets)
  • Each 13 A plug supplying power to the desk can supply either:
    6 sockets, each one fused at 3.15A, or
    4 sockets, each one fused at 5A – for use with lower current desk equipment such as laptops, mobile phones etc
  • The power to the desk must be connected to a mains supply using a 13A plug
  • Max. rating of the electrical system must be 240V 50 Hz 13A.

These desk power socket modules also use the Wieland 3 pole connector system, which allow flexibility on power cable and link cable lengths.

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How are power modules tested?

All our power modules are tested to British Standards General requirements for electrical accessories. Specification to ensure they are safe. This test includes a 15000-socket insertion test. This is a mechanical test that inserts a live plug into the socket 15000 times to ensure the module is safe over its lifetime.

ll CMD modules are also built and tested under strict BSI 9001 regulations and are provided with a 12-month warranty.

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How much power is needed for a laptop?

All laptops will differ in how much power they need and this will also change depending on whether the laptop is charging its battery.  Electrical Safety First states that a laptop may use between 65 – 100 Watts (<0.5A).

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What power do I need for my computer?

All computers will differ in how much power they use. This will be based on the specification of the PC, whether it is on standby or running at full strength.

The average desktop computer consumes 100 Watts (W) and an LCD monitor consumes 100 Watts (W), totaling 200W or 0.86 Amps.

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How do I integrate USB power sockets into desks?

CMD can supply range of on-desk, in-desk and under desk power modules that incorporate USB charging.

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What power modules can be used in conference tables?

In-desk modules are ideally suited to conference tables as when they are not in use the power sockets can be hidden away.

If an in-desk option is not viable, Inca power modules provides power sockets on four faces making it easily accessible to all users.

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How do I calculate the power consumption of office equipment?

To calculate the power consumption of an electrical device, first you need to know the current the device is pulling. This is measured in Amps. This information can be found on the device.

Once you have this you multiply the amps by the voltage (230 Volts for UK) and you have your power consumption.

Example. A laptop is pulling a current of 0.25 Amps. The power consumption of the laptop is 57.5 Watts (0.25*230)