I know that there is a difference between motors designed to IEC and NEMA, my question is there any IEC requirements that prevent the connection of 400V (60 Hz) NEMA motor (e.g. HVAC equipment) to a network 400/230V 60HZ designed based on IEC.
We have a project where the client wants to follow the American Codes/Standards but with European voltage ratings i.e. 400/230V.
I know that most manufacturers now (e.g. Eton, GE..) produce products e.g. Circuit Breakers that are tested according to both European (IEC) and American Standards...
Hi everyone,
I would appreciate your comment on the following case,
We have an essential load connected to one transformer 2000kVA where the whole load is backed up by a generator through Automatic Transfer switch (ATS).
Q1: Could we have the ATS installed between the transformer and the...
I'm referring to my old thread184-20314 related to the above mentioned subject.
Actually the use of Variable speed fire pump controllers has been approved by NFPA 20 – 2003. you may refer to the following clause.
10.5.5 Variable Speed Pressure Limiting Control. Variable speed fire pump...
Hi,
I’m preparing the commissioning document and testing procedure for a project where there are number of elevators installed with 4 m/s (800 ft/min) speed.
My question is related to the acceptance inspections and tests as tabulated in ASME Aa7.1-2000 section 8.10. specifically to the Governor...
Hi,
I’m preparing the commissioning document and testing procedure for a project where there are number of elevators installed with 4 m/s (800 ft/min) speed.
My question is related to the acceptance inspections and tests as tabulated in ASME Aa7.1-2000 section 8.10. specifically to the Governor...
We are designing aircrafts hanger that will accommodate seven aircrafts including B747 and in future A380, my questions are :
- What is the power supply required (400 Hz) for B747 and A380 and does the aircraft consume the full 400Hz power supply during parking or maintenance.
- Is there a...
We are designing aircraft hangers that will house different types of aircrafts including B-747, one of the hanger bay will be used for maintenance. Holding fully fuelled aircraft in the hangers is possible.
NFPA 409 recommends flame detectors to be used for such application, however I am...
I have four chillers 1.5 MVA each; I’m looking for 11 kV soft starters to limit the voltage dip during starting to be within 3% max. I found 6.6 and 3.3 kV soft starters but I’m trying to save the required transformers and switchgear to step down the voltage from 11 kV to 6.6 or 3.3 kV.
Also...
We have water pumps serving combined water\fire network.
In the Code (NFPA) the fire controller is allowed to start a motor while limiting the current drawn by the motor, the stipulation is that the starting period cannot exceed ten seconds.
My question is there any requirements in the Code...
I have water pumps serving combined water\fire network.
In the Code (NFPA) the fire controller is allowed to start a motor while limiting the current drawn by the motor, the stipulation is that the starting period cannot exceed ten seconds.
My question is there any requirements in the Code...
