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What is the maximum stair rise and minimum tread for industrial stairs?
Normally 7" rise and 11" run.
What is the melting loss per kilo gram of all metals?
melting loss very in all castings from 2% to 50%. If you melt aluminum pure ingots & cast within minimum holding loss is 2%. If you cast in small batches it will go up to 15%. If you melt aluminum scrap & cast within minimum holding loss is 15%. If you cast in small batches it will go up to 30% If you melt aluminum turnings & cast within minimum holding loss is 25%. If you cast in small batches it will go up to 50% melting loss very in all castings from 2% to 50%. If you melt copper ingots+zinc ingots & cast within minimum holding loss is 12%. If you cast in small batches it will go up to 35%. If you melt copper turning+zinc &chips & cast within minimum holding loss is 25%. If you cast in small batches it will go up to 50%
What system of manufaturing adopted by Henry Ford divided operations into simple tasks and cut unnecessary motion to a minimum?
Assembly Line
What is idle speed of turbine?
warm up speed of turbine,andthe minimum speed of turbine before loading is called idle speed.
How do you tell the difference between the stainless steel and inox?
hi, They are the same one. Stainless steel and inoxydable is content minimum 10.5% Cr.
What is LV cable insulation resistance acceptance value?
The minimum acceptable insulation resistance value is calculated using the following formula: Rinsulation= (Vrated + 1 ) x (304.8 / L ) Where: Rinsulation is the minimum acceptable insulation resistance value, in mega-ohms; Vrated is the rated voltage of the cable (typically printed on the cable), in kilovolts; and L is the length of the cable, in meters (if the cable length is in feet, replace the number 304.8 with 1000).
How do you conduct an insulation resistance test?
(1)make the transformer R,Y,B,N terminals in GST mode. (2)coneect insulation resistor test set to any of phase. (3)apply high voltage to that connected phase (4)test set will denote u the value of IR
When carrying out an insulation resistance test on a walloven with mineral insulated metal sheathed heating elements the minimum permitted insulation resistance is?
0.1M ohms
What happens to the value of insulation resistance of a cable when the cable gets older?
Insulation resistance should be approximately one megohm for each 1,000 volts of operating voltage, with a minimum value of one megohm. For example, a motor rated at 2,400 volts should have a minimum insulation resistance of 2.4 megohms.
What are the values for insulation resistance test?
Values of insulation resistance vary according to the type of insulators and the size of the conducting material inside the insulators, for instance insulation resistance of wires or cables are determined according to type of insulation PVC-PE-XLPE-..... etc and the size of the conductor, and the standard which the wires or cables are designed upon. For example BS 5308 standard states that cables of conductors 0.5, 1, and 1.5 with PVC insulation should have a minimum insulation resistance of 25 Mohm.km . but cables with PE insulation should have a minimum insulation resistance of 5 Gohm.km ...... Now you may realize the difference in IR values. I hope I manage to make it clear image for the answer.
What should be minimum insulation resistance value for 11 kV HT cable?
65 meg ohm if it is 11 kv
What is a Pelv circuit minimum insulation resistance?
The minimum insulation resistance for a Pelv circuit, which refers to a circuit designed for protective earthing and fault protection, is typically specified to be at least 1 megohm (1 MΩ) under normal conditions. This ensures that the insulation is adequate to prevent electrical leakage and potential hazards. It's crucial to adhere to local electrical codes and standards, as they may have specific requirements for insulation resistance in various applications. Regular testing and maintenance are also important to ensure ongoing safety and performance.
What is the maximum insulation resistance reading on a ring main circuit?
Insulation resistance is measuring the integrity of a conductor's insulation, therefore there is no upper limit as such. Most insulation resistance testers will indicate either >200 (Megohms) or >999 (Megohms) if they reach their maximum measuring capability. What you should be concerned with is the MINIMUM reading permissible: the current edition of BS7671 (17th Edition IEE Wiring Regs) specifies a minimum value of 1 Megohm (1 million ohms) as 'acceptable', but anything lower than 2 Megohms will require further investigation. Some electrical contractors would investigate much higher readings, especially if comparing readings with other circuits that have been tested at the same time, and which have given very high readings.
What is acceptable megohms reading for single phase 240v motor?
For a single-phase 240V motor, an acceptable insulation resistance reading is typically above 1 megohm (MΩ). However, many manufacturers recommend a minimum of 2 MΩ for optimal performance and safety. Readings below these values may indicate insulation deterioration and potential motor failure, necessitating further inspection or maintenance. Always consult the motor's specific documentation for precise requirements.
What is the standard reading in megger testing to conclude that the equipment is passed and or failed?
Meggers send voltage thru the cables to determine the resistance between, meggers like the mj145 have multiple settings from 100 volts to 1000v, a Megger showing a good reading will show megaohms thru its full band, a bad one reading will be indicated by it either reading 0 ohms or less then 30 ohms (depends on the circuit and what's between the wires) a bad indicator can also be a steady reading at low voltage then at higher voltage it spikes to a low ohm, or a low voltage, like as if u just created a short. What that shows is at low voltage your insulator is fine, but at high voltage it blows thru it, normally that means your Insolator around your wire is damaged.
What is the minimum resistance when megohming 13.2kv transformer?
A megger would not be suitable for testing insulation resistance of a 13.2-kV transformer, as the transformer's voltage rating is significantly higher than the output voltage from a megger.
What is passing reading of megger tester on a motor?
The passing reading of a megger tester on a motor typically indicates insulation resistance between the windings and the motor frame. A common threshold for acceptable insulation resistance is at least 1 megohm per kilovolt of operating voltage, with a minimum of 1 megohm being a general guideline for lower voltage motors. High readings (usually above 10 megohms) are considered ideal, while significantly lower readings may indicate potential insulation failure or deterioration. Regular testing helps ensure the motor's reliability and safety in operation.
