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In which situation do we need to follow the communication protocol of BS EN 61850?

If a company pushes you to do wrong electrical work which can be a risk to the safety of life, it is of course unacceptable. Does anybody know where I can complain about the company? I tried to complain to companieshouse.gov.uk , engc.org.uk , and  also  theiet.org ; but they all say that...

Is it mandatory to use a control transformer for all motor control circuits? Or can we take 230V directly from the mains?

Is supplementary bonding only for showers? Does supplementary bonding only connect the shower to a nearby pipe? Or does it connect the shower to a nearby pipe as well as to the main earth terminal?

What is differenece between main and supplementary bonding conductors? Is the main bonding conductor the one that connects to the first exposed metal surface, and the supplementary bonding conductor the one that is connected to the subsequent exposed metal surfaces?

Is it possible to run a larger (35mm2) cable from panel, and put a fused terminal box in the field just before the first light. And from that terminal box I can take smaller 10mm2 cable for looping from light to light? If yes, which company makes fused terminal box? (A bigger cable at the start...

Table 4C1 gives rating factors for cables to be bunched in the same tray. The rating factors are available for upto 20 bunched cables. Can more than 20 cables be bunched together in the same tray?

Does anybody know can a capacitor bank, which is rated for a short circuit of 10kA-1s, be used at a location of 20kA-1s, if a current limiting breaker is used as the incomer of the capacitor bank?

Is the following a good arrangement to control three motors from one contactor? -One main breaker at top -Followed by one main contactor -Followed by three sub-breakers in parallel (feeding three motors)

Does anybodt know formula, if the short circuit peak of a distribution board is 35kA at 10ms, how much the peak will be at 1s?

If the available 3-phase prospective fault current at 3-Phase busbar is 16kA, a three phase fuse rated for 16KA or more will be required at this busbar. Then if we have to connect a single phase (line to neutral) fuse at one of the phases of the same busbar, should this single phase fuse be...

Can the indicating LED Lamp be wired in series with contactor coil, or does it have to be in parallel?

Can a BS88-A1 2A fuse be used for the control circuit (Coil) of motor-contactor?

This refers to the situation when an outdoor motor is controlled by an indoor starter. Is it required by BS/IEC code that in addition to starter, a local stop/start or hand/off/test push button is needed near the motor? Or is it enough to control the motor only from the starter in the switchboard?

If there is option for three lights, then red can be used for motor-run, green for motor-stop, and amber for overload. What should be a good option if there are only two lights available? How about Red for Run and Amber for Stop/Overload?

Can MCB of 50kA be placed in a panel rated for 30kA?

For magnetic only circuit breakers, a separate overload (thermal) relay is required to protect motor, which makes sense. But thermal magnetic circuit breakers already have a built-in overload (thermal) relay. Still a separate overload is used in the starter to protect motor. Does anybody know...

Does anyone know which regulation tells that how much the distance between two vertical cable trays should be before another grouping factor is applied?

Some manufacturers do cable identification in two ways: 1. 2 X 2,5 2. 2 G 2,5 I know 2 X 2,5 means 2 core 2,5 mm2. What does 2 G 2,5 mean?

Can I bunch together several cables in the same tray instead of spacing them apart one cable diameter? Can cables be layered one on top of the other? If yes, how many vertical layers can be placed in the same tray?