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Hello, We are in the uk and there is a proposal for a new switchroom to contain both 11kv and 415v switchgear. Are there any standards that say these should be in separate rooms or separated with a barrier of some kind as I understand that you do not want non mv qualified staff being able to...

Hi, I know this is a bit general but does anyone have a pin out diagram for a 55332-cod TCON board for a Toshiba TV. Thanks

Hello, In regards to cable calculations to bs7671. If we have a cable that needs to run through a duct bank for a small section of its run say 5m and the remainder >80m is in a subway. When we derate can we ignore the duct bank portion? Thank you

Hello, I have a question about diversity and load utilisation factor with Trimble software. Say we have a 3ph 400v 150kW load with 0.8 pf which gives 187.5 kVA and we also have a diversity of 0.8 and a load utilisation factor of 0.9. Applying these factors we will end up with a kVA of 135kVA...

Hello, Can anyone point me in the direction of any good material for 33kV/11KV transformer protection schemes and how the various relays discriminate with each other. Thanks

Hello, I have a question regarding the extension of a data network. If we have a building with a data network and we wish to extend this network to a field junction box that will then allow approx 5 temporary buildings to connect to the data network. Would we need a small outdoor panel with a...

Hello, I have a question regarding extending an existing data network to a new building. If there is only one data point required in the new building would a switch still be installed ? Is there another way to take the existing network to a connection point in the new building ? Thanks

Hello, With regards to Trimble software for bs7671 cable sizing. I understand that a three phase circuit (No neutral) is one circuit and this can be achieved by 3 single core cables. Say for a “box” we have 5 single cables in parallel per phase (15 cables total) in Trimble for grouping purposes...

Hello, I have a question with regards to Trimble cable calculations. Can Trimble be used for calculations with an IT earthing system? Thank you

Hello, I have a question in regards to 11kv ring main circuits. What is a closed ring? Am I correct with the following Say we have a switch board with two incoming supplies and a buscoupler splitting this board into two sections. Would this buscoupler be closed for a closed ring ? Thanks

Hello, I have a question regarding feeder pillars. When are these units best used, is it solely based on length of cable run ( e.g to save long runs) or are there other factors to consider? Thanks

Hello, There is a project to put in a new building and we will have to tie into the existing data network. I know we will need to provide a new switch in the new building but my question is how to tie this into the existing site network? Would this be by fibre cabling to a spare port on the...

Hi, With regards to a feeder cable feeding a small building (bs7671) I have reading conflicting information on whether to use the diversified load or the undiversified load. Say building load is 150kw then after diversity (0.8)and load utilisation factor( 90%) this drops to 108kw. For the...

Hello, I am having some difficulty understanding the electronic protection functions of MCCBs. Does anyone know of any good material that explains LSIG and VE functions and when these can be applied. Eg just LSI, LSIG or LI. Also electronic VE. Thank you

Good afternoon, I know this may sound like a very basic question. Say you have a transformer serving a main mccb panel, why can't the main switch of the panel be just an isolator? I've only seen the main switching device as a mccb or ACB on drawings. Would the protection device on the cable from...

Good morning, With regards to the use of fuse switches and MCCBs what is the process in selecting one over the other. I know they each have their advantages and disadvantages but does it come down to the load they are protecting? Thank you

Hello, Does anyone have a template/reference for an 11k switchboard specification/datasheet? Thanks

Hello, I am enquiring as to the procedure that has to be followed to size a transformer for a project after all loads that will come off the transformer have been calculated. . If anyone could point me in the direction of standards ( uk) / list of steps to be taken. Primary is 11kv secondary is...

Hello, Has anyone wired a Gemu 1230 (with no LEDs)before? We have a design that is showing both opened and closed limits and is using a 2pr cable. The 24v and 0v are linked in the field and both signals are coming back. These are wired to separate channels on a Siemens 6DL1131-6BL00-0PH1) DI...