High voltage low down

Article Abstract:

The power supply equipment for the Jubilee extension to the London Underground train system is being installed by Cegelec Projects at at cost of 52 million pounds sterling. Electrical power is being supplied by the London Electricity company which must ensure that supply remains constant at all times. The electrical contractors had designed two separate 132 kV supplies of power taken from the 400 kV on the National Grid. Both sources will produce a continuous supply of power but in the case of a breakdown on one supply route the other will continue to maintain supplies.

United Kingdom, Contracts, Subways, Electric power distribution, London Electricity PLC, Electrical engineering, Cegelec Projects

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The big bang theory: what is the issue about high energy and low energy circuits, voltage is voltage isn't it? Well, not exactly

Article Abstract:

Multimeter circuit protection requires a combination of steady state and transient overvoltage withstand capabilities. There is also the issue of protection for the operator and the International Electrotechnical Commission (IEC) is addressing the task of defining a new test equipment specification. The industry standard was IEC 348, which was replaced by IEC 1010-1, defining over voltage installation in categories. Multimeters must have minimum creepage and clearance distances between line components to meet the IEC 1010-1 criteria.

Voltohmmeter, Voltohmmeters

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Harmony is a low voltage directive ...

Article Abstract:

UK electrical contractors must install products which meet electrical safety requirements. This requires them to ensure that products conform with the European Union's Low Voltage Directive, which became effective from Jan 1 1997. The European Union harmonized all European electrical safety standards under this directive, and products must now bear the CE mark, either directly or on the packaging. The CE mark guarantees that the product meets safety requirements, and use of products bearing this mark safeguards the contractor.

Electrical equipment and supplies industry, Electric equipment industry, Laws, regulations and rules, Electric equipment, European Union. European Commission, Product safety, Electrical equipment and supplies

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