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DIY Forum >> Electrical Questions >> Electrical Glossary & Other Information https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1096466372 Message started by L.Spark on Sep 29th, 2004, 2:59pm |
Title: Electrical Glossary & Other Information Post by L.Spark on Sep 29th, 2004, 2:59pm Electrical Glossary & Usefull Information Here's a few Electrical Terms that we have listed in alphabetical order to help alleviate any confusion CCT - Circuit CCU - Cooker Control Unit CPC - Circuit Protective Conductor CU - Consumer Unit EEBAD - Earthed Equipotential Bonding And Automatic Disconnection Of Supply ELV - Extra Low Voltage = Below 50V AC \ 120V Ripple Free DC FCU - Fused Connection Unit FELV - Functional Extra Low Voltage HBC - High Breaking Capacity HRC - High Rupturing Capacity HV - High Voltage LV - Low Voltage = 50V - 1000V AC \ 1500V Ripple Free DC MCB - Miniature Circuit Breaker MCCB - Moulded Case Circuit Breaker MD - Maximum Demand MICC - Mineral Insulated Copper Cable aka Pyro PAT - Portable Appliance Testing PELV - Protected Extra Low Voltage PEN - Protective Earthed Neutral PFC - Prospective Fault Current PME - Protective Multiple Earthing PSCC - Prospective Short Circuit Current PVC - Poly Vinyl Chloride RCBO - Residual Current Breaker With Integral Overload Protection RCCB - Residual Current Circuit Breaker RCD - Residual Current Device SELV - Separated Extra Low Voltage SRCBO's - Socket Outlet Incorporating RCBO's SWA - Steel Wire Armour (Cable) UPS - Uninterruptible Power Supply VD - Voltage Drop A - Amp W - Watt V - Volt R - Resistance Z - Impedance mA - milliampere mV - millivolt kW - Kilowatt kV - Kilovolt Feel free to PM me with any additional ones you think are appropriate and should be added. Cable Identification Charts http://www.interpower.com/icl/images/HAR_Wire_coding-ICL.gif [glb]Thanks for Looking![/glb] Created 29/9/04 - Updated 19/4/05 |
Title: Re: Electrical Glossary & Other Information Post by Lectrician on Apr 11th, 2005, 9:47am As a rule for these diagrams, RED becomes BROWN ; YELLOW becomes BLACK ; BLUE becomes GREY ; BLACK becomes BLUE. You may find that the cables between the switches in your property have been connected with a different colour coding. This makes no difference to operation, as long as the colour at one switch matches that of the other(s). |
Title: Re: Electrical Glossary & Other Information Post by Lectrician on Apr 11th, 2005, 9:47am TN-C-S ; TN-S ; TT The T stands for 'TERRA' which is 'earth' in Latin. The C stands for 'COMBINED' in relation to the neutral and the earth. The S stands for 'SEPERATE' in relation to the neutral and the earth. A TN-C-S system has the neutral and earth COMBINED in the Electricity Boards supply cable(s), and SEPERATE with in the installation, (this being the meter position and onwards). A TN-S system has the neutral and earth SEPERATE through-out the entire system, including the Electricity Boards Supply cable(s). A TT system has the neutral running in the supply cable(s) as normal, and the earth from the installation is connected to an appropriate Earth Electrode inserted into the ground. An RCD is essential in an installation formed by a TT earthing arrangement. It is the Electricity Boards responsibility to provide a TN-C-S or a TN-S supply, if requested and available, it is not their responsibility to provide a TT earthing arrangement. In order for the Electricity Board to provide a TN-C-S supply, they have to construct their network to the standards of PME (protective multiple earthing), this is why a TN-C-S system is often referred to as a PME installation. |
Title: Re: Electrical Glossary & Other Information Post by Lectrician on May 16th, 2005, 5:59pm Corrected To 80% 'Rule Of Thumb' |
Title: Re: Electrical Glossary & Other Information Post by Lectrician on May 21st, 2005, 5:50pm Courtesy of BATTS Cables - Reproduced by Lectrician. Sorry for the poor quality - when converting to a gif file, the spreadsheet hidden lines have re-appeared! This is exactly the same as milli-ohm per meter (you still have 3 zero's in the fraction ;)) |
Title: Re: Electrical Glossary & Other Information Post by supersparky on Jun 17th, 2005, 10:15pm IP CODES First numeral: mechanical protection 0 No protection of persons against contact with live or moving parts inside the enclosure. No protection of equipment against ingress of solid foreign bodies. 1 Protection against accidental or inadvertent contact with live or moving parts inside the enclosure by a large surface of the human body, e.g. a hand, but not protection against deliberate access to such parts. Protection against ingress of large solid foreign bodies. 2 Protection against contact with live or moving parts inside the enclosure by fingers. Protection against ingress of medium size foreign bodies. 3 Protection against contact with live or moving parts inside enclosure by tools, wires or such objects of thickness greater than 2.5mm. Protection against ingress of small solid foreign bodies. 4 Protection against contact with live or moving parts inside the enclosure by tools, wires or such objects of thickness greater than 1mm. Protection against ingress of small solid foreign bodies. 5 Complete protection against contact with live or moving parts inside the enclosure. Protection against harmful deposits or dust. The ingress of dust is not totally prevented, but dust cannot enter in an amount sufficient to interfere with satisfactory operation of the equipment enclosed. (Dustproof) 6 Complete protection against contact with live or moving parts inside the enclosure. Protection against ingress of dust. (Dust tight) Second numeral: liquid protection 0 No protection 1 Protection against drops of condensed water Drops of condensed water falling on the enclosure shall have no harmful effect. (Drip proof) 2 Protection against drops of liquid. Drops of falling liquid shall have no harmful effect when the enclosure is tilted at any angle up to 15° from the vertical. 3 Protection against rain. Water falling in rain at an angle equal to or smaller than 60° with respect to the vertical shall have no harmful effect. (Rain proof) 4 Protection against splashing. Liquid splashed from any direction shall have no harmful effect. (Splash proof) 5 Protection against water jets. Water projected by a nozzle from any direction under stated conditions shall have no harmful effect. (Jet proof) 6 Protection against conditions on ships decks (deck watertight equipment). Water from heavy seas shall not enter the enclosure under prescribed conditions. 7 Protection against immersion in water. It shall not be possible for water to enter the enclosure under stated conditions of pressure and time. (Immersible) 8 Protection against indefinite immersion in water under specified pressure. It shall not be possible for water to enter the enclosure. (Submersible) an X indicates no specified protection |
Title: Re: Electrical Glossary & Other Information Post by Lectrician on Jan 19th, 2006, 7:14am There are two main types of single phase concentric cables available. STRAIGHT CONCENTRIC and SPLIT CONCENTRIC. STRAIGHT CONCENTRIC will not comply with BS7671! This is because the neutral is single insulated and not identified. This type of cable is used primarily in the distribution of electricity by the electricity supply companies. SPLIT CONCENTRIC cable will comply to BS7671. This type of cable can be treated like standard Twin & Earth type cables. It also offers penetration protection (A nail WILL penetrate, but will always short live to earth or neutral). It WAS often refered to in the 16th edition of BS7671 for use outside safe wiring zones. This is not the case with the 17th edition. SPLIT CONCENTRIC cable can be terminated at consumer units, distribution boards, switch fuses and other accessories as if it was a standard PVC Twin and Earth cable. No glands are required. Here is a photo of 16mm² Split Concentric with only the sheath removed. The single green and white strands are purely nylon packers - they are not conductors. Here is a photo of 16mm² Split Concentric ready to be used (gently twisted neutrals, sleeved earth) - you could use one peice of large earth sleeve, but this makes the earthing conductors difficult to form. Here is a photo from my camera phone (excuse quality). This is 25mm² Split Concentric terminated into a metal clad Consumer Unit, using a standard brass bush and locknut. The cable is cleated/clipped to the wall to give strain relief. Here is a photo of some fairly rare 3 core 16mm² Split Concentric stripped and prepared. Typically used by the DNO for TN-S supplies. Here is a photo of 16mm² Straight Concentric with the sheath removed. Here is a photo of 16mm² Straight Consentric ready to be used. The CNE conductor (combined neutral and earth) is gently twisted together - no tools used. It is best not to tighted with tools, as this can damage the crutch of the cable, and lead to a hotspot if the cable is run warm. STRAIGHT CONCENTRIC cannot be used if you are wanting to comply to BS7671! You may use SPLIT CONCENTRIC within BS7671, and this can be treated like standard Twin & Earth type cables. It also offers penetration protection (A nail WILL penetrate, but will always short live to earth or neutral). It WAS often refered to in the 16th edition of BS7671 for use outside safe wiring zones. This is not the case in the 17th edition. |
Title: Re: Electrical Glossary & Other Information Post by Lectrician on Mar 21st, 2010, 6:46pm |
Title: Re: Electrical Glossary & Other Information Post by Lectrician on Apr 28th, 2010, 6:51pm Fork Truck Battery Chargers Chloride Motive Power (under other names too). [gallery fullsize]Lectrician/1272477015.png[/gallery] |
Title: Re: Electrical Glossary & Other Information Post by Lectrician on Jun 13th, 2012, 9:30pm High definition PDF file: CLICK HERE [gallery fullsize]Lectrician/1339619403.png[/gallery] |
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