Call support
0400 11 00 81
Email support
Contact Us Now

We do it right the first time

Home >  Blog >  What is surge protection and do I need it?

What is surge protection and do I need it?

Posted by Simon Caddy Electrical on 14 August 2017
What is surge protection and do I need it?

A surge protector is a device that shields computer and other electronic devices and appliances from surges in electrical power or a transient voltage that flows from the power supply.  Standard Australian voltage for home and office buildings is 240 volts, any voltage over this is considered transient and can damage electronic devices and appliances that are connected to an outlet. 

Even though power surges are so brief that they are measured in nanoseconds, they can cause considerable damage to equipment that may be connected to mains power.

How does surge protection work?

A surge protector works by channelling the extra voltage into the outlet's grounding wire, thus preventing it from flowing through the electronic device or appliance while at the same time allowing the normal voltage to continue along its path. 

Electrical surges can particularly damage computer equipment by 'frying' the internal components like the motherboard or even the hard drive.

It is a common misunderstanding that surge protectors will protect electronic and electrical appliances from lightning, the most familiar source of power surges. 

Even the most effective surge protectors cannot protect equipment from the sudden increase in electrical pressure of millions of volts that lightning can supply.

Probably the best way to prevent damage during a severe electrical storm is to unplug devices that could be seriously damaged. 

Surge protectors more commonly protect equipment from lower-voltage surges that occur frequently in modern electrical wiring. 

For example, devices such as refrigerators and air conditioners require large amounts of energy to switch motors and compressors on and off, creating surges in power that disrupt the steady flow of voltage. 

Faulty wiring, downed power lines and faulty equipment at the power source, the electricity provider itself, can all cause power surges as well.

What exactly happens in a surge protector?

For those of you interested in the technical side of what happens during surge protection, here is a summary of what happens.

Most surge protectors operate with the help of a Metal Oxide Varistor, or MOV.  Inside a surge protecting power strip or adapter, the MOV is the link between the surge protector's hot wire and its grounding wire.

The MOV has a variable electrical resistance, which means it can make adjustments to incoming voltage that is either too low or too high.  When it's too high, as in an electrical surge, the MOV redirects only the excess voltage into the grounding wire, where it can dissipate safely.  The safe level of voltage continues to flow through, ensuring uninterrupted use of your electronics and appliances.

Should you use a surge protector?

The short answer YES - where it makes sense to do so.

However, this does not mean you need to connect ALL your appliances to a surge protector, for example, a desk lamp may not be connected, however, your computers, TV and media centres and any other sensitive and expensive equipment most definitely needs to be connected to a surge protector.

It's the simplest and most cost effective 'insurance' for your electrical and electronic equipment.

The important question is not 'do I need surge protection', rather, how do you choose the right surge protection device?

Choosing the right surge protection device

It can be difficult finding the right surge protector for your needs there are many to choose from ranging from cheap to very expensive.  What makes a surge protector good? And why are some surge protectors much more expensive than others? Are there any features you should be looking out for? 

Read on!

What to look for in choosing the right surge protector

Here are some important characteristics of a good surge protector, at the very least, you need to ensure the following;

Indicator Lights

Surge protectors only have a limited lifespan depending on how often they are put to work. Even when the surge protector properly diverts a surge so your electronics aren't damaged, the protector itself can be damaged in the process. One of the most important features then is an indicator light. An indicator light will let you know that your surge protector is working fine. Is the indicator light not working? Time to buy a new surge protector.

UL Rating

As for protection power, good surge protectors will come with a UL rating, a rating by the independent Underwriters Laboratories that tests the safety of electronic devices.  Don't bother with a surge protector that doesn't have a UL rating.

Clamping Voltage

The clamping voltage is the level at which the surge protector starts redirecting the excess electricity away from the plugged-in devices.  In other words, a surge protector with a lower clamping voltage will trigger earlier, thus better protecting your devices.

Response Time

The response time is how long it takes for the surge protector to detect a surge in electricity.  The lower value, the faster the response.  This reduces the time that your plugged-in devices are exposed to the surge.  Ideally, you'll want a surge protector with a response time of 1 nanosecond or faster.

On the down side though, surge protectors are probably one of the biggest causes of RCD tripping.  That being the case, my recommendation would be to limit the use of surge protectors to high value/expensive electronic equipment.

For more information on the right surge protection for your office or home, contact Simon Caddy Electrical today by calling 0400 110081.

We service the Upper North Shore area including Hornsby, Wahroonga, Pymble, Turramurra, Killara, Lindfield, Roseville, Chatswood down to North Sydney.

Author: Simon Caddy Electrical
About: Simon Caddy Electrical is an experienced and qualified electrical company providing a wide range of services, including 24 hour, 7 day a week emergency response. Operating out of Hornsby we cover Sydney's North Shore, Northern Suburbs, Northern Beaches and parts of the Central Coast. We provide a vast range of electrical services to commercial, industrial and domestic clients in accordance with all relevant Australian standards.
Tags: Electrical Safety Smart Devices

Download your guide on
how to make your home
'electrically safe’.

Happy Clients

Great service, no fuss, doesn't cut corners. Highly recommended.

Carolyn Gibbs
Read all

Why choose us

  • We pride ourselves on our excellent communication skills with our clientele and within our team.
  • We strive for a high standard of workmanship and electrical safety, abiding by all Australian standards for the services we provide.
  • We are a Master Electricians Australia Member. By choosing us you are choosing a quality electrical contractor who has proven they have the experience to provide you with a safe, energy efficient solution for your home or business.
  • We deliver on time service with a smile for a fair price with a 12-month guarantee on our work.

Latest News

Read All

Choosing the right extension cord for the job

Posted by Simon Caddy Electrical on 1 December 2017
Choosing the right extension cord for the job
When your nearest power point is just too far away for the power cord, an extension cord comes to the rescue. However, depending on the devi...
Posted in: Electrical Safety Electrical Services  

All you need to know about re-chargeable batteries

Posted by Simon Caddy Electrical on 1 December 2017
All you need to know about re-chargeable batteries
Rechargeable batteries offer power on-the-go with two key advantages over their disposable equivalents: 1. They're far cheaper in the lo...
Posted in: Electrical Services Batteries & Battery Techonology  

How to dispose of your old electronics in a safe and green way

Posted by Simon Caddy Electrical on 1 December 2017
How to dispose of your old electronics in a safe and green way
As technology evolves, so too does our hoard of old and obsolete gadgets. Many of us have accumulated electronic gadgets or even appliances ...
Posted in: Environmental Electrical Hazards Electrical Waste  

What is data communications?

Posted by Simon Caddy Electrical on 18 October 2017
What is data communications?
Offices and even homes have evolved into hi-tech spaces. Think about an office space typically they contain computers, printers, scanners, c...
Posted in: Data & Cabling Electrical Services  
< Previous | 1 | 2 | 3 | 4 | 5 | 6 | Next >

Contact us now

click here

Request a quote

click here
Domestic - Commercial - Industrial - "Nothing's Impossible"
Call support 0400 11 00 81