Where is the resilience ? Jason Yates and I have been discussing resilience recently and how far this should be pushed through out an installation. A recent PDU failure caused by a burnt out cable at London internet hub provider Telehouse, shows just how important resilience can be. A resilient electrical power design ensures that the critical load remains powered at all times and cannot be brought down by a single point of failure as it appears happened here. As Andrew Charlesworth at vnunet.com commented: “So, presumably, right now there is an electrician looking at the burned out cable, sucking in air over his teeth and muttering – what cowboy put that in, then?” – for more information click here.