Home Page News Search Contact Us Language Bar فارسی English
If you have faced with a case that needs conferring during your work or studies, you can submit it here as a "New Riddle" and we'll show it in your name. Notice: Site owners have the right to accept a riddle or not, or make a little changes in submited riddles.
Submit New Riddle

What are the types of Power Distribution Cable Termination and Joints?
Author : Baba - From: qatar
During 11 kV Cable Testing (High Pot Test), why is a -ve Voltage of -11 kV applied B/W Phase to Ground and +/- 22 kV B/W Phase/Phase?
Author : BABA - From: Qatar
I need an auto-transfer switching control diagram for use in main-emergency power supply system. Can anyone advise me?
Author : Alireza
For the same sqmm area, the current rating of the bus bar /ayfy cable  is different.  The current rating of bus bar is lower. why?
Author : - - From: Depa
Need drawing for a manual changeover panel  fed by  2 generators using only 3 manual changeover switches and interlocks if necessary to connect 2 loads in such a way that any of the genset could feed any of the two loads. ...
Author : Sinnadurai Sripadmanaban - From: Srilanka
In  low voltage(110/220/400V)wiring in buildings what is the minimum separation between and maximum length of power,telephone,data,fire,PA wires if run in parallel if done in non metallic conduit?...
Author : Sinnadurai Sripadmanaban - From: Srilanka
What is the suitable cable size in mmsq or AWG to hook up a generator to my home?···
Author : Khalid Ameen - From: Yemen
On what basis is the material and type of armour for an armoured cable is selected
We have come across galvanised wire as well as steel tape armoured cables and steel or aluminium armour for underground cables(power/control/telephone etc). ...
Author : Sinnadurai Sripadmanaban - From: Srilankan
What is the minimum height of mounting of receptacles in homes where kids live?. Is it the same in offices?. Please quote from codes/standards/regulations applicable in BS/NEC/VDE etc ...
Author : Sinnadurai Sripadmanaban - From: Srilanka
what are the recommended test voltages? For hipot test what are the test voltages(ac/dc) for various types of cables(pvc/xlpe/MICC etc) of different rated voltages, ...
Author : Sinnadurai Sripadmanaban - From: Srilanka
we will take the readings of a xlpe cables  insulation resistance  by megger after and before hi pot .we found after hipot reading is less than before .why?
Author : george.v.sebastian - From: India
I have problem to make wiring diagram
I need to install manual change over switch from genset
and suply 2 switchgear with 2 ACB and 2 transformer, how to make interlock between ACB and ....
Author : Hery - From: Indonesia
Had a vendor come out to test a 200 Hp motor and someone allowed him to Hipot our motor feeder that was fed from a size 5 Magnetic motor starter about 200 ft away. ...
Author : Stephen Alewine
need a schematic diagram of change over(3 phases) with 2 incoming
schema power & control
Author : kavi narain - From: Mauritius
I want to ask for help ... who is willing to send me an example of a simple diagram for ATS / AMF single phase and three phase
Author : Yonathan - From: Indonesia
How to connect an auto changeover switch for the generator. I need to connect a 3 phase 300kva generator rated at 100A MCB, which is normally feeding single circuits and few 3 phase appliances....
Author : lucky mbambo
Just wondering if you would be able to assist me in a calculation. Ive two separate circuits both rated at 150MVA/656Amps at 132kV at 50Hz. These are both ....
Author : Anthony
Sir, why the graphite coating is applied over on the power cables and what purpose, what will be happened if will not be.
Author : ramalingam
I want to design an ATS using four poles contactors with interlocks and relays to control utility power and a standby source. Could you help me with the diagram? thank you very much for your time.
Author : Augustine Wakla Neufville - From: Liberia
I need control and power drawing of ATS use with three Contractors, two control eight pin relay, two second base timer and with selector switch and push button switch  for auto and manual.
Author : Mukunda Dahal - From: nepali
Armoured cables  of DG sets  should be glanded at both ends.  Is it make any circulating  currents ???
Author : soman - From: India
Change Language :