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Which appendix of BS7671 describes the ingress protection (IP) values?
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Define a luminaire in BS7671?
a luminaire is defined as in bs7671
BS7671 is statutory?
the uk electricity is generated at what KV?
Ring final circuits in domestic properties usually require a protective device which is rated at?
According to BS7671:2008, Requirements for Electrical Installations, an overcurrent protection device rated at either 30 A or 32 A is required.
How do you use the onsite guide bs7671?
buy one and youll find out
What is design current?
BS7671:2008, Requirements for Electrical Installations, defines the design current (of a circuit) as 'the magnitude of the current (rms value for a.c.) to be carried by the circuit in normal service'.
How do you use BS7671 and IEE wiring regulations when selecting wires and cables and when carrying out tests on systems?
Tense your buttocks, wait 5 seconds and push. The correct wire should appear out of your anus. Congratulations
What is a line or phase wire?
Although you may hear the term 'phase wire' used in the field, the correct term* is 'line wire', or more properly, 'line conductor'**, and it is one of the three 'hot' (slang) conductors in a three-phase, three- or four-wire circuit (the fourth conductor being a neutral).[*Previous editions of BS7671 Requirements for Electrical Installations, used the term 'phase' to describe the 'hot' conductor. With the publication of BS7671:2008, this reference has at last adopted the correct terminology, and now uses the word 'line' throughout.][**They are called 'line' conductors, because the voltages measured between them are termed 'line' voltages even though, in the case of a delta-connected source, they are numerically equal to the corresponding 'phase' voltages.]
What is difference between phase neutral ground and earth?
phase - hotneutral - returnground, earth - safety groundCommentThe correct term is 'line', not 'phase'. For example, after incorrectly using the term, 'phase', for many years, the latest edition of IET Wiring Regulations (BS7671) now uses the correct term, 'line', to describe the energised ('hot') conductor. Despite this, the terms are widely misused in the field. Unless used in this way, the resulting terms, 'line voltage (and current)' and 'phase voltage (and current), are meaningless.The three 'hot' wires that interconnect the supply and the load are termed 'lines' (which is why voltages measured between them are called 'line voltages' and the currents passing through them are called 'line currents'). The term, 'phase', describes the connection made between any line conductor and the neutral conductor (in the case of a four-wire system), or betweenany pair of line conductors (in the case of a three-wire system). To put it another way, a 'line' describes an individualconductor or terminal, whereas a 'phase' describes whatever is connected between pairs of conductors or terminals.
What are the various sizes of cables and their uses?
Massive of range of cables. Generally speaking lighting 1.5mm cable. Power 2.5mm cable. Anything feeding an appliance up to about 9.5kw 6.0mm cable. Above that 10.0mm cable. Domestic feed 25.0mm cable (16.0mm earth) hundreds of different supply and demand sizes. Refer to bs7671 17th edition for more information.
What are IEE regulation in wiring?
BS7671:2008 Requirements for Electrical Installations: IEE Wiring Regulations, 17th Edition. Strictly speaking, this document is published by the IET -the Institution of Engineering and Technology, as the IEE (Institution of Electrical Engineers) no longer exists.
Bs7671 reqirements for electrical installations 17th edition is it statutory or to be complied ith?
BS 7671; The IET Wiring Regulations (currently the 17th edition: 2008, with a first amendment made in July 2011) is a non-statutory document. However, the electrical industry deem it to be a minimum technical standard generally expected. If you had selected a way of designing/installing/verifying an installation or part of it, to a method other than as per stated within BS 7671, but it was equivalent in regards to safety, etc., then you may have a justifiable defense against legal issues.
What is the maximum insulation resistance reading on a ring main circuit?
Insulation resistance is measuring the integrity of a conductor's insulation, therefore there is no upper limit as such. Most insulation resistance testers will indicate either >200 (Megohms) or >999 (Megohms) if they reach their maximum measuring capability. What you should be concerned with is the MINIMUM reading permissible: the current edition of BS7671 (17th Edition IEE Wiring Regs) specifies a minimum value of 1 Megohm (1 million ohms) as 'acceptable', but anything lower than 2 Megohms will require further investigation. Some electrical contractors would investigate much higher readings, especially if comparing readings with other circuits that have been tested at the same time, and which have given very high readings.
