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What is the non-auto MCCB? and what is the difference between it & the isolator? If it is put as a main incoming to a SMDB (which in turns feeds multi DBs), & the SMDB itself is fed from an MDB (which is fed from the transformer); does the discrimination is guaranteed??

I refused the submittal requiring an official letter from the manufacturer to ensure that the thickness of 1.5 mm (which is less than that specified) will not only satisfy the mechanical impact protection degree of IK10, but also will have the sufficient rigidity and strength in withstanding the...

Thank you very much for your replies. It really helped in my decision.

The main Low Voltage Panel (LVP) that I mean here is the panel directly connected to the transformer LV side through ACB. In the local specifications of the project which I'm working, the panel is specified to have a thickness of minimum 2mm for its frame steel sheet body. The contractor...

Why we put yellow/green earthing connector between parts of cable trays? does this have any relation to the bolts&nuts connecting the parts of the cable tray? (they cause a hotspot if any leakage current passes for example? or what?)

Dear all, What are the differences in the characteristics of material between aluminium & polycarbonate? What are the suitable applications for Al covers & what are those for polycarbonate covers in lighting fixtures? And what about the difference in prices? Thank you all.

Dear all, I need to know the differences between using RMU & MV switchgear. And when to use each one. I think in RMU: 1) Not more than one TR can be used 2) Protection relays can't be as MV switchgear. 3) Looping manueavering is not available in RMU. Are these correct? what are the correct...

Deep thanks to all of you colleagues :) Really, great supporters :) :)

Dear all, In a Single line diagram a dotted line is drawn between the two incomings of an MDB (one coming from transformer & the other from a generator), and written above it (ELECTRICAL AND MECHANICAL INTERLOCK). I understand that this interlock is to execute the task of (1 out of 2), but why...

Dear all, We used to write a comment: (All switchboards'/MCCs' components are to be from the same manufacturer), and I think this has to do with some requirement in IEC 60943 (I think which is updated by IEC 61439). Is this really a requirement in the new IEC or in any standard?? Thank you.

Thank you Kiribanda for your persistence in trying to help me :) Earth termination network is the earthing grid dipped under ground soil.

I need something like that but downloadable for free : http://www.scribd.com/collections/4364598/All-Electrical-Method-Statements

Dear all, Can you help me with a PDF reference including method statements for variuos electrical works? I need to revise those submitted by the contractor versus the good steps that shall be done in all types of electrical works (earthing, lightning, lighting fixture installation, wiring...

Dear Kiribanda, Here is the CAD earthing schematic diagram drawing. The question is why there isn't a connection from the earth bar in the electrical room (as per the typical attached schematic diagram) just as the connection from the earth bar within the Telecomm. room. Thank...

A distribution board (DB) in the ground floor located inside an electrical room, is fed from a Sub main distribution board (SMDB) which is located in the same room. In the earthing schematic diagram submitted, there is no earthing cable from the earth bar installed on the wall to the earth...

Thank you all, really I got great benefit from the info you declared.

Thank you Keith. And so?? What will be the points that shall be connected to the BMS system?? Current through an ammeter? Voltage through a voltmeter? Or a single point from a differential relay for example that subtracts vectorially both angles to calculate the power factor?? i.e. how is...

Dear all, The BMS (Building Management System) monitors all pieces of equipment within the project. A submittal for the BMS mentions that the points taken from the PFC (Power Factor Correction) is only one point "general fault". Is this correct & sufficient. Thank you.

As a common practice, I know that no problem to put power cables for CCTV cameras with fibre optic cables.

As my experience in site works is not great, so I'm afraid to ask a question and appear silly in front of the contractor! May be the terminology differs from country to country, may be the market language is different than the exact technical language, may be I miss the information and need to...