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What is the Utilisation cat for NS MCCB and ICS and ICU percentage ?

IEC 60947 define ICS as the "rated service short-circuit breaking capacity" while ICU as the "rated ultimate short-circuit breaking capacity". The Ics is a percentage of Icu. For "Utilization Category B" breakers, Ics is always equal to Icu. An example for Utilization Category B breakers from our...

What is the calculation for heat dissipation in BTU/HR?

Issue: How to calculate the heat dissipation in BTU per hour Product Line: All Schneider product lines Cause: The calculation to determine the BTU for adding a piece of equipment to a cabinet to prevent overheating. Resolution: To calculate heat dissipation, multiply watts by 3.4192. The result...

What is the definition of ANSI 50V/51V - Voltage-restrained overcurrent?

Phase-to-phase short-circuit protection, for generators. The current tripping set point is voltage-adjusted in order to be sensitive to faults close to the generator which cause voltage drops and lowers the short-circuit current.

What is the definition of ANSI 50N/51N or 50G/51G - Earth fault?

Earth fault protection based on measured or calculated residual current values: ANSI 50N/51N: residual current calculated or measured by 3 phase current sensors ANSI 50G/51G: residual current measured directly by a specific sensor.

What is the definition of ANSI 50BF - Breaker failure?

If a breaker fails to be triggered by a tripping order, as detected by the non-extinction of the fault current, this backup protection sends a tripping order to the upstream or adjacent breakers.

What is the Restricted earth fault protection and how to implement on Low Voltage ?

The restricted earth fault protection (ANSI 64REF) can be applied if the downstream power system neutral is earthed at the transformer (document attached). This is a differential protection function that detects the difference between residual currents measured at the neutral earthing point and at...

What is meant by vector group for transformers and why is it important?

What is vector group for transformers? A vector group is the International Electrotechnical Commission (IEC) method of categorizing the high voltage (HV) windings and low voltage (LV) winding configurations of three-phase transformers. The vector group designation indicates the windings...

Video: How do I upgrade the firmware on an APC Network Management Card (NMC) or NMC embedded device (Rack PDU, etc)?

Issue You wish to upgrade your Network Management Card's (NMC) firmware or have been instructed to. You have a device such as a Smart-UPS, Smart-UPS Ultra, Easy UPS On-Line, Easy UPS 3-Phase, Rack PDU, AV unit, or environmental monitoring unit with an embedded NMC that you wish to upgrade. You had...

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Popular Video FAQsPopular Videos
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Learn more through our Generic Knowledge FAQsGeneral Knowledge
What is meant by Symmetrical and Asymmetrical breaking currents?

issue: Customer wants to know the value of the symmetrical and asymmetrical breaking current of the circuit breaker and what do they mean. Environment: Circuit Breaker Resolution: - Symmetrical breaking current is the RMS value of AC component of short circuit current at the instant of separation...

Apa alternatif replacement battery UPS SURT15KRMXLI jika APCRBC140 tidak ready stock?

Apa alternatif replacement battery UPS SURT15KRMXLI jika APCRBC140 tidak ready stock? ======================================================================= Untuk alternatifnya bisa menggunakan battery pack type SURT192XLBP sebanyak 2 sets, karena didalam 1 set SURT192XLBP terdapat 2 sets battery...

In a 3 phase system, why does the meter still show voltage reading on one of the phases even after breaking the phase circuit?

Issue: Testing phase loss on a meter doesn't result in a null voltage reading. Environmnet: EasyLogic Series Power Meters PowerLogic Series Power Meters Resolution: The voltage seen is what we call "phantom voltage", its a known phenomenon with all high impedance power meters. These phantom...

What is Power Factor Correction (PFC) - Does it help conserve energy?

Issue: What is Power Factor Correction (PFC) - Does it help conserve energy? Answer: Power Factor Correction (PFC) doesn't directly reduce the overall electric consumption of a device or system, but it does play a role in optimizing the efficiency of electrical systems, which can indirectly lead to...

Which RL(lead resistance from CT to relay) is to be used in Knee Voltage calculation if Current Transformers (CTs) used in High Impedance Restricted Earth...

Issue: Having two different values for RL ( Lead resistance from the CT to the relay); RL from the phase CT to the relay and RL from the neutral point CT to the relay Environment: Protection Function ANSI 64ref High impedance differential Sepam 80 Current Transformer requirement Resolution: In any...

What is an Electrical "Ground Loop" - How does it affect my equipment?

Issue: What is an electrical "ground loop" and how does it affect my equipment? Environment: Ground loops can occur in any situation where multiple electrical devices are interconnected, especially when those devices are powered from different sources or located in different places with varying...

How to reset Zelio logic password?

The password can be reset by clearing the program inside the Zelio either by Transfering a new program to the Zelio Or Clearing the program that already exist by updating the firmware Kindly find the steps a) Clearing the program. b) Module / Update module firmware. c) Clear the Program Contained...

What is the selection criterion of Circuit Breakers for the Capacitor bank application.

The selection should be done after derating the Circuit Breaker taking into consideration voltage variation and capacitors tolerances that could increase nominal current up to 1.5In. The Derating factor of 1.5In Where In = Q/ ( Square root of 3 ) Un Q = Capacitor Power Un = Nominal Voltage...

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