MK 6 AMP TYPE 2 M6 MCB CIRCUIT BREAKER 240V LN 5906 BS 3871

Product Information

Virtually every building in the UK, regardless of use, will contain electrical devices and equipment, which are central to everyday living and convenience. However, transient over-voltages, also known as power surges, can seriously damage these pieces of equipment. Damaged equipment not only incurs the expense of repair or replacement but also further, long term costs such as lost data if storage devices are damaged. New Requirements Now I’ll set up a nifty little tool; a special transformer that lets me produce output of arbitrary phase angle. The output is still 277V RMS relative to our zero reference, but I can shift its phase relative to phase A. Lets call the output of this transformer ‘phase W’. I adjust phase W so that it is very slightly delayed from phase A, and graph the two phases. Originally there would have been a graph like we still get for a fuse and I would not think they would comply with BS7671:2008 and will need replacing to comply. Not sure what I would code it as? I think Code 2 "(Requires improvement) This code is to be used to indicate that the observed deficiency requires action to remove potential danger. On a slightly more benign note, circuit-breakers are designed to run warm in normal conditions when carrying load current. The thermal performance of the assembly is considered in BS EN 61439 to ensure that the internal temperature is not excessive and the operation of protective devices is not impaired – when excessively warm for example, the thermal overload operating current of a device will reduce, potentially causing premature operation. Excessive temperatures may affect the control circuits of electronic equipment mounted in the enclosure. If devices from different manufacturers are used together, the venting characteristics may not be coordinated which could result in significant further damage to adjacent devices or other parts of the distribution board.

A Type 2 device offers protection against over-voltages from switching and indirect lightning strikes. This type more commonly uses a metal oxide varistor (MOV) to divert the current away. Type 3Which leaves you with the lighting circuits - how far down the cable do you need to go, if the 3kA value is present at the DB, using 1.5mm2 conductors before you are safe again - not far I suspect. is a nice number for rules of thumb , 1.6mm is nearly 1/16 of an inch and almost exactly the diameter of 16 standard wire gauge and 16 Birmingham sheet metal gauge, though not american wire, but AWG 14 is ~ 1.6mm dia. ) BS 3871 circuit breakers were also manufactured as Type 4. Generic data cannot be used for Type 4 circuit breakers and the manufacturer’s data must be used to calculate maximum values of earth loop impedance. The more common forms of Type 4 are listed in the following tables, together with their maximum values of Z s, for 0.4s and 5s disconnection times. FEDERAL For non-residential properties that do not fit into these categories, a risk assessment must be carried out, a process that has also been simplified in the 18 th edition, detailed in section 443.4 of the IET Wiring Regulations. Where this risk assessment is not conducted, the regulations require that surge protection is implemented. Types of Surge Protection

Now, imagine that I start delaying phase W more and more. As I do so, it gets more and more different from phase A. The sine wave that is the difference between phase A and phase W gets larger and larger. Eventually this resultant sine wave is actually _greater_ than phase A. This difference sine wave reaches its peak when phase W is exactly 1/2 cycle from phase A, meaning that the +peak of A corresponds to the -peak of W. At this point, the amplitude of the _difference_ between the two phases is twice the amplitude of each phase alone. This is to say that if phase A is 277V relative to neutral, and phase W is 277V relative to neutral, and 180degrees out of phase with phase A, then the voltage A to W is 534V. MCB (Miniature Circuit Breaker ( BS 3871 ) is a mechanical device operate automatic operation designed to connect and disconnect the electrical circuit in the ordinary and extraordinary situation.Suitable for AC and DC voltage.It mean main function is to protected equipment or circuit from overload and short circuit.At time zero, phase A is zero, but phase W is negative, say by a couple of volts. Then at time 1/240 phase A is at its positive peak, but phase W is slightly below. A teensy bit later, phase A is on its way down, and phase W hits its peak. And so on through the cycle. Both phases have the same amplitude, but hit their peaks at different times. There is usually a slightly different voltage between the two, but since sometimes A is more positive and sometimes W is more positive, the two graphs _must_ cross. My only hope is now if someone has any brochures stored somewhere with let through tables/graphs. Otherwise I will be replacing them Make a graph of the difference between A and W, and you will find out that it is a sine wave with low amplitude. In fact, it is a law of mathematics that the sum or difference of two sine waves of the same frequency (but possibly different amplitudes or phases) is another sine wave of the same frequency, again with different frequency or phase. If you are looking for a reason to scrap the existing, then absence of that data is as good a reason as any