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Hello, I am working on a small lift station(pumping storm) that requires a 75 kVA transformer. "Is a Transformer enclosure with a Type 2 driphood enclosure sufficient or should it be a NEMA 4 enclosure?"

Hi all, I am experiencing a problem with a VFD that seems to be getting damaged when the motor starts. The overcurrent protection of the VFD is set to around 70A, while the motor has a full load current of approximately 80A, 600V, 3-phase at FLA. I am wondering whether the issue may be caused...

Hi all, I am experiencing an issue with a low-fault current panel X that is connected to an upstream feeder breaker with a capacity of 600V/400A. The client wishes to increase the fault current in the current panel X, but replacing the panel is a challenging task. To resolve the issue, we have...

We have a unit new 75kVA dry transformer on site now. I would like to know how many of the existing transformers can handle more load in the future. After checking the existing demand load, around 50kVA was used up to date. The name plates say that low-temperature rise of 80 C and the insulation...

Hello, I am working on the panel schedule, and I noticed that some panel has MLO, and some panel has MCB. I believe that the omission of a main breaker in many of these cases is due to cost and perhaps in some cases available panel real estate. Is there any rule for MLO or MCB? I am not...

Hi all, Currently, I am designing the grounding system and I am exploring software options that can simulate a grounding plate instead of mesh grounding. I am aware that ETAP has a grounding design function, but I am not sure if it can support grounding plate design. Can you recommend any...

Hi all, I have a renovation related GFI installation. i need to replace normal receptacle with GFI receptacle. Does GFI receptacle has to have GFI breaker at the same time? Thank in advance !!

Hi all, I have a switchboard with 347/600V c/w 600A which has panel A with demand load 100A , panel B with demand load 200A, panel C with demand load 200A, panel D with demand load 200A. I am sure if 600A is right main breaker size or not. Can you please advise how to size main breaker of...

Hello, I am evaluating the power consumption at steady load of a RTU(roof top unit) which operate at 600V an MCA of 8.2A. So that would come out kw = 600 x 8.2 x 1.73 = 7.1 kw. But cooling power input (w/o blower)load says only 2.51kW as per name plate, which load should I consider for load...

Hello all, I am currently designing an elevator and machine room for subway. Electrical specification say as below MAXIMUM ALLOWABLE VOLTAGE VARIATION IS +/- 10% KONE CALC THE FOLLOWING FOR THIS ELEVATOR DUTY NAME PLATE AMPS : 15 Max ACCEL AMPS : 26 PROTECTION DEVICE REQUIRED PRIOR TO...

Hello, All I am working IR(infra Red)heater installation with heater starter on site. Electrical drawing provide one circuit for two IR heater with starter. It seems that starter was composed of timer, thermostat controller, contact relay and others. As each IR starter require own starter...

Hi all, i'm working on the preliminary design for a subway ground grid. I got informed the soil resistivity from the site and it is 300 ohm-m. so I started playing with the number using IEEE 80-2000. So my concern is , what kind of simulation is required for sizing grid grounding. For...

Hello, I am working on an SPECIFICATION low voltage 100kW loadbank. Regarding rating, what specification is correct? For example, 3ph 3w or 3ph 4w.

Hi all, When I put the data in the multi function relay from the library ETAP, it was not stored. Even enabled was checked, in other word, check this box to enable the parameters for selected supplied model number. Have any ETAP users encountered this problem, and how is it resolved ?

Hi everyone, I am learning CDEGS recently, I found out "there are defects in the grounding grid during simulation, Use the diagnostic tool for more information. Does any body experience this problem? Thank in advance!!

Hello my friends, I am struggling to calculate touch, step and GPR according to IEEE std 80, 2000. soil resistance: 2500 OHM*M fault current : 10kA current division factor : 20% Can I calculate standard and calculation values above without using software ? The result is quite strange to me...