Is it a MUST that all MV (11kV) generators to be grounded through impedance? or can we connect a 11kV generator solidly to ground?...when do we need each type of the following grounding system:
· SOLIDLY GROUNDING
· LOW IMPEDANCE
· MEDIUM IMPEDANCE
· HIGH IMPEDANCE
Elecme
Is it mandatory by the code to provide complete detection in high rise building with mixed activities (Library, theater, restaurants, offices etc.)or partial coverage is sufficient.
Elecme
Do we have to ground the MV (11kV)deisel generators through impedance ?.... and what is the difference between high, low impedance and solidly earthing rather than the limitation of the fault current and the interruption at 1st or 2nd fault......etc.
Elecme
I am very interested in small power plants, composed of number of generators synchronizing switchgear and the like.
I am talking about a specific job, which is providing an industrial area with a power estimate of 12 MVA with such a small power plant. I have the following inquiries:
What is the...
What do you think about loading a 11/ 415 V transformer by a light load (25 - 30 %) of its rated capacity.
Are there any problems with harmonica ?!What about the effect on the other loads. Elecme
In case of phase to ground short circuit, will we experience a case of over voltage on the other two phase in a specific earthing system? Please elaborate. Elecme
What are the benefits of the twisted pair cables in the field of signal transmitting process?
I have to approaches for the issue as follows:
1. Due to the twisting of the cables, any field that will be appeared on one line, because of mutual capacitance between conductors, will be eliminated...
I am now working on the design of the sound system as well as voice/ data network of a great library whcih contains many exhibition halls.
Can any one help tell me the concept of design or his recomendation for these systems?
I prefer wall mounted speakers and local matrix switch for each hall...
Could anyone advise about the different methods of repair for the leakage of the SF6 Gas in a GIS 225kV susbtations.
Also i will appreciate if anyone can recommend specific web sites for this concern.
Elecme
Can someone refer to the NFPA cluase where i can find where to locate the fire alarm panel, i mean at the ground floor or could it be located at upper levels and if the hight of the building has any relation to that ? Elecme
Can someone refer to the NFPA cluase where i can find where to locate the fire alarm panel, i mean at the ground floor or could it be located at upper levels and if the hight of the building has any relation to that ? Elecme
Could anyone advise about different methods of electrical power installation in exhibition halls, I mean to serve the exhibitors in different and various locations.
Also are there any manufacturer that have under floor trunking for power sockets. Elecme
Consider that we have a large 415V induction motor fed from a utility power supply and backed up by a generator. Also an ATS is available for transferring the motor to be connected to the generator supply in case of normal power supply failed.
Suppose that the normal power supply failed and the...
Could anyone help identify the minimum distance required between two transformers (for two oil filled transformers and for teo dry type transformers). Please mention some reference from IEC or IEEE or NFPA.
Thanks, Elecme
Are there any code restriction to install 11kV switchgear, 11/ 0.415kV transformers, generators and 0.415kV switchgear in a mechanical room housing air handling units and pumps without any separating walls?
Or do i have to have fire rated walls ? Elecme
What is the minimum and maximum hight from ceiling to instal a beam type smoke detector?
And what is the maximum distance between the beam detector transmiter and receiver?
Please mention the NFPA reference. Elecme
