Wallis provides top level of protection
01 February 2000
EQUIPMENT manufactured by Wallis Surge Protection of the UK is claimed to offer high level protection against power spikes, which includes not only those generated by lightning strikes, but also the much more common effect from switching induced loads.
Wallis products provide safeguards to all critical equipment involved with day-to-day commercial and production operations, while also maintaining the effectiveness of security installations which are equally important, says a company spokesman.
"Banks, insurance and pension companies, government buildings, hospitals and many other public, commercial and manufacturing companies can benefit from a protected power supply guaranteed by Wallis equipment to provide uninterrupted services and security," he says.
Speaking on the power spikes problem, he says mains power lines entering and leaving buildings provide access for current surges and overvoltage resulting from atmospheric lightning discharges. These need not be direct strikes, but just local area activity. The high cross-sectional area of mains cables provides little attenuation against this form of corruption, which can have catastrophic effects upon both business and production, says the spokesman.
He continues: "Even where UPS devices are fitted, these are usually designed to prevent brownouts and blackouts due to undervoltage. Similarly disastrous effects can be experienced from simple network switching, usually of inductive loads, taking place within a building.
"Wallis supplies a full range of devices, fitted in parallel with the incoming mains, reduce surges and overvoltages to an acceptable level. They also provide protection for both single and multi-phase supplies. The devices are wall-mounted and independent of the mains current rating. The response time is less than 10ns and the maximum current surge rating is 20kA. The modes of protection include phase/neutral, phase/earth and neutral/earth for working voltages of 200-280 Vrms single phase and 345-485 Vrms three phase," he says.
"Indicator lights provide visual confirmation of protection levels with green showing system protected, a flashing light shows reduced protection and red indicates the need to check or replace equipment," he continues.
The mains power protection equipment can be supplemented, according to him, with individual devices to provide protection for:
To ensure a fully integrated protection system, Wallis supplies a comprehensive range of earthing and equipotential bonding equipment. All equipment conforms to BS6651: 1992 Appendix C for protection of structures against lightning, he says.
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