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Hi! We have a VFD run Motor which is critical for plant.The Motor is supplied from Normal 480 V power supply & Switchgear panel has back up of emergency diesel generator.Operation is asking to also connect the motor with the Emergency switchgear from another plant.i.e Motor shall have two...

Thanks, please note that the Transformer was energised & running before start of the Motor. The Transformer & motor are from two different plants with power coming from common 34.5 KV bus. If we energise the Transformer & then there is a Termination failure of Transformer HV cable it is sure...

We had a failure of 34.5 KV cable termination in 34.5 KV/13.8 KV Transformer during switching of 25.4 MW motor (through Softstarter). The concerned motor & Transformer are in different parts of plant.Is there any contact between switching & termination failure.

i have two motors which have been recommended by manufacturer to be greased with Poly Urea Grease. For our other motors we have grease type Esso Unirex N3. Can the Esso unirex N3 grease can be used in place of Poly urea grease. Thanks

correction specification NS 100 L MA 25 thanks

We are using a breaker from Telemechanique NS100L-MA 125. I need to know whether this breaker is suitable for frequent start/stop operations.There is no duty AC21/AC22 /AC 23 mentioned on it. Thanks

Its my mistake in writing the breaking capacity for the Bus, it is actually the short cicuit withstand capacity.The fuse link is knife type link for neutral circuits.

Mr. Bulsara as i understand you are saying is that if the fuses(or MCB) are on the primary side of the control transformer or if there is no control transformer then the fuse( Or MCB) breaking capacity shall higher than the breaking capacity of the BUS. The breaking capacity of the bus is 80 KA...

I am doing a project to replace control fuse of circuits with MCB/MCCB's.One of the aim is not to disturb the original design.Due to that i want to replace fuse with breaker of same breaking capacity.my question is that is there critical role for breaking capacity of control circuit fuse.How is...

As per the standards what is the size of the copper cable in ground reel for grouding the Trucks. thanks

I have an Emergency Panel 480/277 V 3 Ph,4 Wire,60 HZ . It has in outgoing 3ph 4 wire breakers connected. I need to purchase a new de watering motor of 1 HP & to give power from this panel. 1. Can i connect 1 phase also from the outgoing 3 ph breakers. 2. The voltage for 1 phase is 277, so will...

THe question here is that the batteries are placed inside the substation & someone has rasied a near miss incident that there shall be Eye wash station.I am checking the standards to confirm that if the batteries are sealed type & we are not doing any maintenance then somewhere is it written...

Is this applicable also for the batteries where there is no maintenance. In our case for these batteries we do not do any maintenance, as these batteries are sealed type.

We are using Sealed type Valve regulated Lead acid batteries. The installation of the batteries is in the substation in Rack arrangement. i.e there is no seperate room for these batteries. Is Eye wash station is required as per IEC standards. As per my info eye wash station is required if one is...

If the Miniature Circuit breaker which is made for voltage 220 V DC & if the Power circuit is such that it is supplied with 120 V Dc.Is there any problem or it will not work

It is shielded single core cable

In my opinion there should be a similarity in the drawings & the actual at the site. Now that you mention that many contractors & designers worked for the project, there must have been lot of confusion in the Tagging system. If the problem is only that of tagging you can keep the same Tag no...

Does The portable cabins which serve as offices, require lightning protection.

HOw much will be the Weight of copper in One meter of 300 Sq mm XLPE copper cable. Is 2.68 Kg a coorect answer.

I have two motors Existing & New motor New Motor 460 V Delta,60 HZ,cos Phi=0.89, Current : 18A 11 KW IP 55 81 KG S1 1M B3 60 HZ rpm : 3515 160M-PB01Z-V DE 6309 ZZ C3 DIN 625 NE 6308 ZZ C3 DIN 625 Make : SCHORCH Existing Motor 460 V Star, Current : 16.8A 11KW IP W55 SI UT Grade deg...