Health and Safety H&S at Work What is a hazard? What is a risk? Hazard to risk 1 Hazard to risk 2 Hazard to risk 3 Dealing with risks COSHH Electrical dangers Fuses Calculate fuse rating Initial surge Rule of thumb Wiring a plug Surges and spikes Pat testing PAT labels Overdue PAT tests Fire drill Classes of fire Fire Extinguishers Moving and handling Ergonomics Maximum comfort Workstation setup DSE 1992 DSE and employers Desks and chairs Noise Information
Technicians’ Site

Copyright © Anne Watson

Home. e-learning. Multiple Choice. Handouts and Links. Contact Anne. About this site.

Surges and Spikes


In the UK, voltage supplies to premises can vary immensely. While many domestic electrical items can cope with these variations, sensitive computer systems cannot.


When an increase in electricity supply lasts three or more nanoseconds, it is called a surge.


When an increase lasts for one or two nanoseconds, it is called a spike.


A nanosecond is a billionth of a second.


Surge protectors can be used to prevent damage to computer systems. They work by diverting the extra electricity back through the wall socket's earth.