0
How do you use bs7671 wiring regulations when selecting wires and cables when carrying out tests on systems?
Wiki User
∙ 10y agoWant this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
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
Why does polystyrene melt when in contact with plastic electrical cable insulation?
AnswerIsn't polystyrene commonly known as "styrofoam" ?If so, why is it coming in contact with electrical wiring?In any event, if the polystyrene is melting, the wiring may be overloaded or has a hotspot due to a failure. The wire may be getting hotter than it should be.I am not aware of any chemical reaction that would occur if the two plastics touch each other at room temperature.I am:-Polystyrene is commonly used in loft and wall insulation, just the places that cables are run. The plasticisers used to make the PVC insulation on the cables flexible reacts with the polystyrene resulting in the polystyrene appearing to 'melt' and the plasticiser migrates out of the cable making it brittle and causing the insulating properties to break down. The cable will eventually fail, especially if disturbed and this is both a fire and electrocution risk.There is the added problem that the cables will get hotter due to the thermal insulation properties of the polystyrene preventing the cable from losing heat. If this hasn't been allowed for in the design of the circuit it too could be a fire hazard.The wiring regulations (BS7671 section 522.5.3) prohibits contact between PVC cables and polystyrene, but this is a common problem. An electrical engineer (or most electricians) can do a periodic inspection of your wiring system that includes insulation tests that will identify failed or failing cables. The only solution is to replace damaged cables and reroute them or provide conduit to protect them.PS Styrofoam is, I believe, an American brand name for polystyrene often associated with disposable coffee cups and similar products.
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
Define a luminaire in BS7671?
a luminaire is defined as in bs7671
BS7671 is statutory?
the uk electricity is generated at what KV?
How do you use the onsite guide bs7671?
buy one and youll find out
Which appendix of BS7671 describes the ingress protection (IP) values?
App 5
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.
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'.
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.
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 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 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 is the current carrying capacity of 6mmsq mm wire?
Unfortunately, there is no straightforward answer to this question. A cable's current-carrying capacity depends on various factors, including: the number of cores, its type of insulation, whether it's armoured or not, and the method of installation. Depending on these factors, the current-carrying capacity varies from around 14 A to around 21 A, but for specific information, you'll need to check out the appropriate Tables in BS7671:2008 Requirements for Electrical Installations.
