surge protection

[assegayer]

hi guys,

is there no such device that is sold where you can wire your two mains tails into then out to the cu to offer surge protection..say you have a dodgy supply (i know very unlikely in UK) it will just trip out and protect your appliances from burning out from 280 or 300 volts in worst worst case

 

[telectrix]

you can get surge protection that fits in the CU to protect 1 or more circuits. e.g. just protect socket circuits.

 

[assegayer]

thanks for the reply, do you reckon you could get me a link to an example?

 

[Leesparkykent]

thanks for the reply, do you reckon you could get me a link to an example?

Hager - Surge Protection Kit & Guide

 

[assegayer]

Thanks a bunch fot that link mate. Seems quite expensive though ay

 

[Leesparkykent]

Thanks a bunch fot that link mate. Seems quite expensive though ay

I didn't see the prices but I'm sure other manufactures will do something similar.

https://m.youtube.com/watch?v=iHFMB5orgk8

 

[Leesparkykent]

Contactum also supply DB's with built in surge protection.

Surge Protection | Contactum

 

[Marvo]

hi guys,

is there no such device that is sold where you can wire your two mains tails into then out to the cu to offer surge protection..say you have a dodgy supply (i know very unlikely in UK) it will just trip out and protect your appliances from burning out from 280 or 300 volts in worst worst case

Apart from maybe on comms networks you're unlikely to find surge protection that will protect against 280-300 volts. In electrical networks this would be classed as overvoltage rather than surge, it's the kind of voltage that results from a floating neutral on the supply side. To be classed as a transient the duration would usually be <1mS, the kind of fault that would give you an overvoltage of around 10%, ie 280v, would most likely be a much longer duration.

Surge protectors basically make a path to earth once the supply voltage reaches their clamping voltage but there's a limit to how much energy they can sink to earth so they're only good for overvoltages of a very short duration (surge), they're not designed for persistent overvoltage faults. For these faults we'd usually use an overvoltage relay to protect the installation which actually disconnects the supply.

Overvoltage relays Voltage Relays - Power Distribution - Siemens

Surge protection http://library.abb.com/GLOBAL/SCOT/SCOT209.nsf/VerityDisplay/F1D312EC7475F837C1256EF5003024FB/$File/FRSOX_0201_04-GB.pdf

 

[Biff61]

ABB OVR T2 unit is good for surge protection, unit is pluggable modular and can be easily replaced. ranges from 1.2 to 1.8Kv
The following info from ABB makes interesting reading.
Voltage surges, often referred to as spikes or transients are typically caused by switching of fluorescent lights, fuses blowing or nearby lightning activity. The worst voltage surges are usually caused by lightning and can reach up to 6000V, with current surges of over 3000A. The maximum size of the voltage and current surges depends on the location within the building's wiring system. BS7671: 2011 Amendment 1 Sections 443 and 534 cover risk assessment and provides guidance on protection of electronic equipment for installation engineers to follow. The fullest information on lightning and surge protection comes from the BSEN 62305 series of standards.[FONT=Arial, Verdana, Helvetica, sans-serif] [/FONT]

[FONT=Arial, Verdana, Helvetica, sans-serif]For over or under voltage, use a good AVR, or stabilizer, if you dont want to disconnect the supply every time there is a surge in voltage. I work in Africa and ensure all my boards are surge protected, this is due to the Lightning strikes to ground. Additionally the frequency of brown out and the prolonged dips caused by transmission switching causes more headaches than you can imagine. So everything is stabilized as well, with stabilizers that can operate up to 15% +- the supply voltage.[/FONT]