Surge Suppressors ? A Initial Line of Defense

All house theater gear ought to be equipped with at minimum some form of surge safety. Surge suppressors signify the most fundamental form of energy safety ? a first line of defense for all delicate digital gear.

Maintain in thoughts that a surge in the ac voltage or a lightning strike, could lead to disaster – turning expensive gear into a cigarette smoking heap of plastic and metal. Investing in a suitably rated surge protector is surely a lot less expensive than getting to change expensive house enjoyment electronics.

The large choice of suppressors accessible on the market at an even wider variety of price ranges can make the procedure of selecting an appropriate safety device far from easy. Many of these surge suppressors would appear the same to a non-technical person – with almost nothing that distinguish the least expensive from the best.

In their easiest form, surge suppressors frequently come as an inexpensive surge protected numerous-outlet energy-strip. Much more expensive units would normally include extra surge protected connections for the telephone line and the coax Tv input some units include surge protected LAN connections as well. In this manner, something that interconnects with your gear would have to go first via the surge safety circuitry within the energy-strip.

How Surge Suppressors Work

The fundamental operational principle behind surge suppressors is to clamp high transient voltages while absorbing this possibly destructive energy. This energy is then dissipated in the form of heat – thus protecting susceptible circuit components and stopping system damage.

In the occasion that the surge lasts for a number of milliseconds, the procedure might also trigger sufficient present to trip the home circuit breaker, or blow the gear fuse, thus protecting your gear.

Surge suppressors usually make use of a combine of components to suppress voltage spikes on the line. Nevertheless, the mostly used element in surge safety circuitry is the Metal Oxide Varistor (or MOV).

The MOV is not the only surge safety element ? gasoline-tube surge arrestors, avalanche diodes (similar to energy zener diodes), and reactive kind passive circuitry utilizing inductors and capacitors, all possess the preferred electrical attributes needed to dampen a transient behavior.

None of these gadgets does signify the perfect surge suppressor. Some lack pace, while other people ? like avalanche diodes ? although extremely quick acting, do have a limited energy absorption capability. For this cause, industrial surge safety gadgets mix a number of of these technologies organized in numerous stages, to prolong surge suppressor life and improve response times.

Surge Suppressor Ratings

This discussion will not be total without highlighting a few of the most fundamental parameters that outline the capabilities of a surge suppressor these are the UL listing, voltage rating, peak surge present, and energy dealing with.

IEEE 1449 Underwriters Laboratories Listing: Referred to as ‘UL 1449′ or simply ‘UL listing’, signify a set of specs that figure out if a surge suppressor is safe during use.

Ensure that the selected surge suppressor is labeled as ‘UL-listed transient voltage surge suppressor (TVSS) 2nd edition’. A UL-listing as ‘power tap’ is not adequate.

A UL-listed TVSS does not imply that it will protect your gear from surges, but rather that the surge protector is not likely to pose any individual hazard to you during use e.g. via electrocution, fire, and so on.

Running Voltage: The decrease the voltage rating of a surge suppressor, the more efficient safety the surge suppressor will provide, however the voltage rating has to be in line with the respective software. In specific, the chosen suppressor voltage rating ought to permit the normal peak AC voltage to exist across the line ? this is 1.414 times higher than the specified RMS worth.

Peak Surge Current: This represents the maximum transient present that the suppressor can handle during a surge.

Joule Rating: Also referred to as ‘Energy rating’, this is a measurement of the energy absorption capability of the surge safety device. Typical values might vary from 500 to 3000 and over. The higher the joule rating, the better is the surge suppressor capability to absorb energy spikes on the line.

A Word of Caution

Designed correctly, surge suppression gadgets can function over-and-over once more, but…

Do not take surge suppression gadgets for granted. Beware of cheaply produced energy line conditioners and other safety gear. Some surge suppressor components used in these gadgets are typically a 1-time use only. This means that your system might end up completely unprotected after a surge.

High quality: The high quality of a surge suppressor is reflected in the price of the safety device, but not only. Examine the joule rating of the surge protector to get an indication of how a lot damaging energy the suppressor can handle. The larger the joule rating is, the better. Maintain in thoughts however that in contrast to the UL-1449 Listing, there is no standardized testing methodology to figure out the energy rating of a surge suppressor. Hence, do not depend on the joule rating alone ? appear also at the built-up high quality and in specific, at the product warranty on offer.

Warranty: In addition to the regular product warranty, some manufactures also offer a ‘Connected Gear Item Warrant’. This is normally in the region of a number of tens of 1000′s of dollars.

A longer product warranty time period and a higher connected gear warranty worth reflect a higher level of self-confidence on component of the manufacturer that the surge suppressor can protect your expensive house theater gear. Attempt to go for surge suppressor gadgets that come with at minimum a five-year product warranty time period, and a minimal of $10,000 (preferably $25,000), connected gear warranty.

Performance: The performance of surge suppressors degrades with every surge absorbed. The problem here is that the price of degradation is totally unforeseen because of to the unpredictable nature of the surge. Surge rise time, peak voltage, energy level, and duration, all have a varying impact on surge safety circuitry.

A surge might have a higher energy level than the suppressor can handle, leading to the destruction of the suppressor and zero safety against possible future surges. To reduce this danger, leading-high quality energy safety gear would normally make use of over-rated components in safety circuitry – thus allowing numerous surges to take place without any damage to the gear.

Surge Suppressors are not lightning safety gadgets: Surge suppressors can provide sufficient safety from ‘normal’ surges on AC energy lines. Protection against lightning strikes it is a completely various story. No surge suppressor device can offer you the needed level of safety in this respect.

Personal security: Ensure that your surge suppressor is clearly specified as UL listed Transient Voltage Suppressor (2nd edition). This will reduce the danger of individual hurt from fire or electrocution particularly during a surge. At the same time, maintain in thoughts that a UL-listed device does not guarantee that it will protect your gear.

Conclusion:

In reality, surge suppressors are just a first line of defense ? they do not provide safety from damaging voltage fluctuations and noise on the line that can seriously degrade the performance of your AV gear.

Surge suppressors ought to form component of an general energy safety solution ? the use of line conditioners and ac-regenerators coupled with an appropriately rated surge suppressor would surely provide a more complete method to protecting expensive digital gear.

Obviously, there is a price to spend for energy safety, but it is actually – an ounce of prevention that can conserve you a large headache down the street!

Andrew Ghigo ? A Telecoms/Electronics engineer by profession, with specialization in digital switching and telecoms fraud management methods.

Editor and publisher of http://www.practical-home-theater-guide.com – a website devoted to all house theater enthusiasts with the scope of serving as a complete house theater guide to house theater methods, product reviews and house theater design.

This article is an excerpt from a series of articles appearing beneath the Power Protection area of the website.

Topics coated include advantages of energy safety in the house theater, energy line conditioners, ac regenerators, and surge safety. There is also a ‘before-you-buy’ energy safety checklist, and a short discussion on the possible use of inexpensive computer-grade uninterruptible energy materials, as component of a house theater energy-safety solution.