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Hi, Is this wiring to Power meter is acceptable as per IEC? We have metering CT installed on upstream of MCCB and connected to power meter. Generally we install CT on Downstream of MCCB. So I got confused if it is acceptable as per IEC.

Hi, In ABB ACH580 VFD drive we have output relay RO3 which I'm using for fault signal. The relay got contact 25, 26 and 27 terminals. 25 and 26 are NC. 25 and 27 are NO. I'm using fault(-1) option means inverted fault and they recommend to use NO terminal which is 25 and 27. Im confused. My...

Thank you so much for the detailed explanations.

There are highest structure which are 6m tanks, 9m street light poles are nearby. But I don't see any lightning protection for them. So If I roll a spere they would roll only on street light pole and tanks only. Since there are no lightning for those structure it can not fully protect my...

Thanks Mr. Che Kuan. If I install a 1m tall lightning rod on a 3m high shelter, Does it require a wind load calculation as per IEC?

Hi All, we have 2 numbers of Low voltage MCC kept inside a shelter in outdoor tankfarm area. The Dimension of the shelter is 5m length, 3m Width and 3m height. Does this small Shelter requires lightning protection as per IEC standard? There are Tanks and high structures are there in this tank...

Which Option is mostly used?

Hi, The power meter's voltage input shall be taken from Primary or secondary side of the Main Circuit breaker? In this Schematic they shown on Primary side of the Circuit breaker. Is it okay?

Hi, Any IEC standard stating the requirement of Fire resistant cables in Hazardous Zone areas?

Actually the load is not a typical motor. It's an electrical magnetic Vibrator Vibrator video Link The Breaker and the load equipment are brand new.

Sorry, there was no lightning

The load connected in this circuit is a Silo Vibrator (Datasheet attached). The load is installed outdoor and the Power Panel where the DOL circuit is installed in indoor substation building. The actual load current shown in the datasheet is 2.3Amps. But the circuit breaker selected is 0.63A...

Please find the below picture and a video. https://res.cloudinary.com/engineering-com/video/upload/v1692931593/tips/video_20230823_144912_ur98u7.mp4

Hi, Today one of the Schneider make MPCB (GV2L04) rated for 0.63A burnt inside our panel. This circuit breaker was feeding to a 150W single phase (230V) motor. We have used Tesys T LTMR for DOL starter. When the incident happened, it was raining heavily. We suspect that the water leaked...

Hi, We have a motor control center panel with power meter mounted on it. The power meter reading shows that the power factor of Bus A is 0.5Lag and Bus B is 0.3Lead. How dangerous is this? any Why the this occurred? What's the solution?

Hi David, DO I need to install Harmonic filter in this VFD panel to control the harmonics? Please advise.

Hi, Below snaps are taken from Schneider power meter mounted on 250kW ATV630 VFD showing harmonics. Please explain in detail why 5th order harmonic is larger than 3rd order? What shall I do next?

Hi Jraef, In local mode it works fine as I give Run Signal by energizing K11 relay. Once I give Run command the internal starter dry contact (R1A-R1C) closes and it will energize K1.

Can I start from SCADA if the status on Starter shows "nLP"?

Hi, I have ATS48 Softstarter circuit as shown in the attached PDF. In "Manual" mode, I can start the motor from MCC Start button and the "Run" Logic input in the Starter received signal so it closed R1 and subsequently R2 dry contacts inside the Starter so K1 and K3 contactors energized and the...