Hello
Can a Current Transformer with a ratio of 50/5 be effectively utilized on a 1200A bus or incoming cables?
What are the key considerations when using this CT on a higher ampacity application?
Also, any recommendations for CTs that can accurately detect 48 Amps?
What is the nature of the loads? - Non-linear loads. Only loads on the system are switching power supply units L-N (277V)
Is distortion power factor a factor? Yes
Hello
I have a harmonic current spectrum from a system test performed which could be only loaded 25% of its rated load (the remaining loads are still under construction). All the loads are L-N well distributed. There is no other type of load in this system.
To obtain the full load (100%)...
Hello All,
Is anyone aware of a manufacturer or firm that makes (pre-fabricated) an enclosure with DC (up to 1000vdc) and AC contactor with 24vdc coil? Will be using this for testing PV inverters. The reason I ask is as pre-fabricated enclosure will be tested and listed as well. Attached is a...
Hello All,
Can someone help me with a link to interconnection requirements for California (SCE) when adding Energy Storage and PV to the existing office building? For both Export and Non-Export.
In the attachment, it says "Control power to the Shunt Trip with Lockout must be removed for a minimum of 0.25 seconds before the breaker can be closed". Why wait for 0.25 seconds what is logic behind...
Thank you, @jraef. Now I understand. In the manual on page 38, I see the kW also listed (attached snapshot). Here the total kW will be 66.7kW for the whole system correct?
I am working on short circuit calculations for a system. There is an HVAC unit (nameplate attached). I did verify (Unit Power Supply) the cable and upstream protective device do meet the minimum circuit ampacity and max circuit breaker size, respectively. I have the following questions about the...
Is there a REVERSE transfer switch? I have seen a transfer switch that switches a load between two sources. Is there an application or product which operates opposite to a typical transfer - switch between loads instead of sources (A single source with the option to feed a small ampere load vs a...
Hi @IonelHutz,
Understood :). Can you advise me on manufacturers who would have a heavy-duty contactor rated for 480V but have circuit coil voltage of 24 to 120V ac/dc? I did find Square D, and Eaton has few options.
Hello All,
I am looking for any ideas and a sample electrical design if available. A design to feed I want to connect and feed a separate load contactor-based design to switch between different loads when from a source. As shown in the attached picture (it is high level) the generator feeds the...
Hello All,
I am working on my first electrical design project which entails to size breaker, wire, conduit, grounding, etc. In the project, I need to design an electrical layout to have a switchboard which will have DERs (solar, Battery, and windmill) along with utility *& conventional...
