Lightning Protection - advice and guidance from ELECSA
WEBFeb 17, 2016 · Regulation 411.3.1.2 (Protective equipotential bonding) requires that the connection of a lightning protection system to the protective equipotential bonding shall be made in accordance with BS EN 62305. It is advisable that the exact position of bonding connection are agreed and determined by consultation with a lightning protection engineer ...
Voltage Drop Calculator - Voltimum UK
WEBJul 1, 2022 · Voltage Drop Formula. The voltage drop formula is expressed as Voltage Drop = ( mV/A/m ) x L x Ib / 1000. mV = millivolts. A = Amps. L = Cable Length in meters. Ib = Design Current in Amps. / = Divide by 1000 to convert the result from Millivolts to Volts. mV/A/m = millvolts per Amp per Meter. To find the mV/A/m for a type of cable, the volt ...
The principles of Protective Multiple Earthing (PME) - Voltimum UK
WEBDec 19, 2017 · To minimise the risks associated with PME, the combined conductor is earthed at multiple points along the network and bonding is provided, in accordance with BS 7671, within the consumer’s installation. Due to the low earth loop impedance path, there is a potential for higher fault currents to flow in a PME system, therefore the main ...
Conduit sizing - Voltimum UK
WEBAug 18, 2022 · Answer 3. Using the formula to determine the minimum internal diameter of the conduit: Taking the nominal wall thickness of the conduit as 1.6 mm would give a minimum internal diameter of 19.1 + (1.6 x 2) = 22.3 mm. Therefore, the minimum standard size of conduit that complies with the 35 % space factor is 25 mm.
Maximum prospective fault current - Voltimum UK
WEBJul 4, 2017 · Maximum prospective short-circuit current (line-to-neutral) = 230/0.05 = 4600 A (or 4.6 kA) (This value would have been given directly if the instrument had a prospective fault current range). The same procedure is now repeated to calculate the line-to-earth value, and the highest of these calculated values should be recorded as the maximum ...
Cable Size Calculator - Voltimum UK
WEBJul 1, 2022 · Calculate the minimum cable size for various cable types, protective devices, installation methods and correction factors, also calculates voltage drop, R1+R2 and Ze, based on British Standard 7671. - Calculate a cable size in two easy steps with instant results! Download here.
Q & A of the Day - What maximum demand and diversity
WEBApr 7, 2010 · The fuse is a 60A BS1361 Type2a. Using Appendix 1, Table 1B in the On-Site Guide, I have carried out the following: Cooker circuit - 10 + (22 x 0.3) + 5 = 21.6A. So, the maximum demand with diversity taken into account is 90.32A. Surely, in this instance, a 100A main fuse should be used, rather than a 60A fuse to satisfy the criteria of Ib must ...
18th Edition – Reminder RCD Testing for different Types
WEBMay 24, 2019 · Type A & F: Trip threshold is influenced by the smooth DC content (offset value) e.g. Type A must still trip with < 6mA smooth DC superimposed on the pulsed waveform. Type F must still trip with < 10mA smooth DC superimposed on the pulsed waveform. Type B smooth DC residual current, are designed to trip between 0.5-2I∆n.
Q & A of the Day – Is there a minimum distance
WEBNov 19, 2013 · Justin asks this question, which concerns whether he needs to provide a certain minimum distance from an LV panel for safety. It has been answered by SELECT (Theme – Fire, Safety and Security):
Health and safety guidance for working near overhead - Voltimum …
WEBApr 4, 2017 · Health and safety guidance for working near overhead power lines. This article reviews the general health and safety guidance for assessing and controlling such risks contained in the HSE Guidance Note GS6 (Fourth edition) Avoiding danger from overhead power lines (2013). Overhead electricity …
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