As for the equipment inside, there are certain differences: the first level distribution cabinet generally has isolation switches, circuit breakers, leakage protectors, etc. Two-level protection refers to the leakage protection of the main distribution box and switch box. Adequate system designs allow for the system to withstand and isolate faults while not causing additional damage and/or outages.
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The first protective relays were electromagnetic devices, relying on coils operating on moving parts to provide detection of abnormal operating conditions such as over-current,, reverse flow, over-frequency, and under-frequency.
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All final sub-circuits of construction wiring must be protected at the switchboard where the sub-circuits originate by a residual current device (RCD), with a maximum rated residual current of 30mA, that operates in all live (active and neutral) conductors. In AC systems, additional protection by means of an RCD with a rated residual operating current not exceeding 30 mA shall be provided for: socket-outlets with a rated current not exceeding 32 A in locations where they are liable to be used by persons of capability BA1, BA3 or children (BA2, BA3). RCDs provide life-saving protection by detecting earth leakage currents and disconnecting the supply within milliseconds. The concept of RCD, or Residual Current Device, is an essential tool in construction. In layman's terms, it's a protective device designed to instantly cut off electricity when it detects imbalances in current flow.
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This handbook is written to assist in the understanding of the IEC 62305 series of lightning protection standards. This guide simplifies and summarizes the key points of the standards for typical structures, and as such, the full standards should be referred to for final. The motto in the picture – BLITZSCHUTZ GIBT SICHERHEIT ("LIGHTNING PROTECTION PROVIDES SAFETY") – is as relevant today as it ever was, with external lightning protection still providing valuable passive fire protec-tion in the event of a direct lightning strike. nVent Engineered Electrical & Fastening Solutions is a leading global manufacturer and marketer of superior engineered products for niche electrical, mechanical and concrete applications. These nVent products are sold globally under a variety of market-leading brands: nVent ERICO welded electrical. Furse is the market leading lightning protection brand from Thomas & Betts, providing solutions worldwide for structural lightning protection, power earthing and electronic systems protection.
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When lightning strikes a lightning conductor, a short electrical impulse with a voltage of up to hundreds of kilovolts arises in the latter.
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