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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...

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

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

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...

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

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...

We have Battery Banks for UPS which has critical load. The battery are Power Safe Lead acid Sealed batteries. THe Installation is 5 yrs old.There are two banks each having 66 cells.Each bank has two strings of 33 cells each During last year Battery discharge test we found 70 batteries out of...

I am working in Air seperation plant & we have a cold box. The cold box is tallest structure in our company. It is mettalic( but painted). Over the top of cold box is JIB crane which is taller than cold box. In my opinion Lightning rod which is connected directly to the Earthing Electrode is...

I Need to protect pipeline ( oxygen & nitrogen) from lightning, one way is for grounding the pipeline & the other way is to put lightning rod & arrestors. Has somebody worked for this subject. i need ideas for succesfully protecting the pipeline from lightning. These pipelines are outdor &...

I need to replace Fuses in Control Circuit with the MCCB. The rating of Fuses are 2A 4A, 10 A. The need to replace these fuses came as it is difficult to trouble shoot the System & change the fuse every now & then. My question is that the Equivalent MCCB atings shall be same or diferent.

My Question is regarding the manned locations such as control rooms, is there any NFPA standard which says that the Control room shall not be installed with Fire extinguishing system such as FM 200 or NOvec 1230. We have a project of installing Fire extinguishing System for control room, but...

I have few doubts about CT Stability testing for Differentials relay. The differential relay is protecting the Cables. 1) How much current shall be injected in Cables from Test kit while testing Stability & Unstability 2) What is the acceptable differential current flowing during the testing of...

Does any one has NACE standard RP 0177 for insulating flanges and fault current protection for Pipelines, oxygen service

Happy New Year ! I have some Questions regarding Cathodic Protection & Earthing system, i am referring to Pipeline structures 1. Is both overground & underground pipelines are required to be protected by CP system or only pipelines below ground need CP protection. 2. Is earthing required for...