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What's the reason for having parallel breakers, instead of having a single 2-pole 200A?

First time to see this 200A circuit breaker installation having quad 2-pole circuit breakers. This is a GE THQMV200L plug-in type breaker. Each line is served by two breakers. I have to replace the CB due to loose line side contact fingers but it's not locally available. Can I work around this...

Some additional data: -there is an existing 34.5 kV aerial distribution line at some areas above the railway -cables are laid on concrete cable trenches along the sides of the carriageway -cable is not earthed during the test; will see if test can be conducted with one end earthed -the cable...

This has got me stumped. We are conducting loop check on shielded power cables that are in present service. There are some discontinuities in the shield of the cable which were bonded only now, long after the cables were put in service. It is for this reason that loop checking on the shield is...

We are conducting a retrofit on our DC switchgear (750V railway) and additional bus bars will be installed. However, due to space restrictions we have an issue on the allowable clearances between the positive or negative bus bar and the enclosure or any metallic support. Please enlighten me on...

So if the cable is new and were to be subjected it to an insulation resistance (Megger)test, would it be correct to set the tester to twice the phase-to-phase voltage rating of the cable (that would be 6kV)?

A 300mm2 shielded XLPE power cable has the following marking embossed on its outer sheath: 1.8/3(3.6)kV. What do the figures in this nomenclature mean?

Can a VFD rated for a 184 kW motor successfully operate a motor with a much smaller rating, say 55 kW? I'm working on a project which would require VFD control for the sewage pump motors. Initially, 55 kW pumps would be installed but these would be scheduled for replacement with 184 kW after...

What is the latest edition of the AISC Manual of Steel Construction?

busbar, jbartos & PWR Thanks all for your reply to the post and references you've mentioned

What is the difference between a neutral grounding resistor and a neutral grounding reactor. Can one be used instead of the other for grounding substation transformer neutrals?

Mazhar, I realized that what you gave was for a lower voltage. We normally use 5 or 6 disc insulators for 69 kV, and 42 feet is quite low for that voltage class. However, I was more concerned with the manner in which they are erected which I believe would be the similar. By the way, you...

Thanks for your prompt advice, mazhar.

The towers are for 69 kV lines for which we intend to have a ruling span of 300 metres across rice fields.

Can someone in the forum give me a brief description on how HV transmission towers are erected in rural areas and the equipment usually used?

We doing upgrade works (additional disconnect switches, power circuit breakers and neutral grounding resistors)on a 2x25 MVA substation. The existing transformers are 69 kV delta-13.8 kV wye with a solidly grounded neutral. Prior to our work, three single-phase wye-connected automatic voltage...