Surge Protection

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What is Surge Protection?

Surge Protection Devices (SPD’s) are parallel connected devices whose sole purpose is to divert potentially damaging voltage transients to earth; thus preventing sensitive electronic equipment such as computers, control and communication equipment from being exposed to such voltages.

If you have surge protection device on site this will be checked by our engineers during the annual service visit and if it is found that the SPD has failed or absorbed a transient we are able to provide a quotation to replace this so the supply is kept fully protected.

Also if you do not have any Surge Protection, PFC Engineering can offer a full surge arrester survey, design and installation service that will be tailored to the specific needs of a client’s power system.

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Types of Surge Protection

Type 1

  • Type 1 Surge Protection is designed to protected against large power surges on the main supply from events such as lighting strikes

Type 2

  • Type 2 Surge Protection is designed to offer protection from over-voltages resulting from events such as load switching.

Type 3

  • Type 3 Surge Protection is designed to provide localised protection for more sensitive equipment such a computers. This type of device is to be use in conjunction with Type 1 or Type 2 surge protection devices

18th Edition Wiring Regulations

Surge Protection Devices (SPD’s) are now a requirement for all installations under Amendment 2 of 18th Edition Wiring Regulations. There are no exceptions permitted where over-voltage can cause

  • Serious injury to, or loss of, human life
  • Failure of a safety service
  • Significant financial or data loss

What we can do to help

Should you wish to further investigate your sites Surge Protection requirements we can arrange for one of our engineers to visit your site and provide a no-obligation quotation to install.

If you already have Surge Protection on site , we can check the status of the installed equipment and are able to supply and install a direct replacement to any failed devices.

Surge Protection FAQs

Surge protection devices are used to protect sensitive electrical equipment such as computers and control equipment from potentially damaging voltage transients.

This can vary depending on the make of surge protection installed but the SPD will usually have some form of indicator for each phase. This is usually a colour tab or indicator light showing if the phase is healthy or has reduced protection. Most SPDs will have instructions regarding this printed on the front of the equipment, however if in doubt feel free to contact us and we will be able to assist in identifying any failures.

Typically Surge Protection devices can be replaced without the need for a shutdown as they should have their own means of isolation, whether this be localised fuses, MCB or switch.  As well as being installed in such a manor that replacement can be carried out without effacing the site supply in anyway.

Latest News – Active Harmonic Filtration

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Surge Protection Replacement at Office Building

During the annual Power Factor Correction (PFC) service, an inspection of the on-site Surge Protection Device (SPD) identified reduced protection levels on two of the three phases. This degradation is most likely attributable to a recent voltage…
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Surge Protection Replacemnt

During a annual Power Factor correction service it was noted that the on site Surge Protection device was showing reduced protection on the L3 phase due to the equipment absorbing a transient event on the supply.   Surge protection…
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