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What is the formula for calulating test voltage for Insulation Resistance Checking?
Wiki User
∙ 15y ago
Estimated Insulation Resistance of a cable:
IR = K log (D/d)
K = specific insulation resistance in megohs - 1000 feet at 60 Deg. F (K = 2000 for PVC; 50,000 for EPR; 100,000 for XLP)
D = diameter over insulation
d = diameter under insulation
IR = insulation resistance in megohms - 1000 feet. Note that IR is inversely proportional to the cable length. So don't forget to divide the calculated IR for 1000 ft. by your Cable Length (L) then multiplied by 1000.
Be advised that in the real world, the measured IR may not be anywhere close to the calculated IR due to extraneous influences such as humidity, temperature, dirt, etc.
Wiki User
∙ 13y ago
Wiki User
∙ 15y agoRule of thumb for DC Voltage: 2 x Insulation rating of the equipment under test + 1000 Volts. For example a 2000 volt insulated cable should be tested at 5000 VDC.
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How do you test leakage on equipment?
by measuring the insulation resistance then by usig the formula for finding leakage current leakage current =voltage applied /resistance measured by megger.
How do you calculate contact resistance?
Resistance is resistance , no matter if it is contact resistance or any other resistance. And formula is R = V / I.
What is the formula used to determine insulation resistance in a motor?
2 meg ohms, 2,000,000 ohms to ground. 1 meg ohms.
Formula for resistance of a parallel network?
Rtotal = 1 / ( (1/RA) + (1/RB) )
What is formula for calculating the total resistance in a series circuit with threeresistors?
RSeries = SummationI=1toN (RI) Simple answer; add them up.
How do you test leakage on equipment?
by measuring the insulation resistance then by usig the formula for finding leakage current leakage current =voltage applied /resistance measured by megger.
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).
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How do you calculate contact resistance?
Resistance is resistance , no matter if it is contact resistance or any other resistance. And formula is R = V / I.
Formula to calculate min insulation resistance?
insulation resistance = (2 * operating voltage +1000V) at operating temperature if you define what you mean by minimum insulation resistance maybe i could help 132,000V on the towers is usually happy with 6' of air some insulation is far better than air dry air 500v/mill thermoplastics 6000v/mill your power drill has 1/8" - 1/4" of plastic on the cord and perhaps .001" on the wire in the coils the cord gets rougher handling anything practical insulation resistance (2 * operating voltage +1000V) witch means a 1500Vdc megger is ok for 120V appliances should be safe to handle if its more than 10megohms the 1500V will bridge any pinholes or airgaps NEVER use a vom the 9v battery wont find a pinhole or an air gap ceramic on heaters and toasters has a way of letting metals diffuse in it lowering the resistance over time also it usually lowers with temperature so the resistance reading will be a lot lower while its hot
What is the dimensional formula of Resistance?
Resistance = V/I Dimensional formula for V ML2T -3A -1 Dimensional formula for I A Dimensional formula for R= ML2T -3A -1 / A = ML2T -3A -2
What is dimensional formula of resistance?
Resistance = V/I Dimensional formula for V ML2T -3A -1 Dimensional formula for I A Dimensional formula for R= ML2T -3A -1 / A = ML2T -3A -2
What is the Dimensional formula of thermal resistance?
no
What is formula symbol for Resistance?
The symbol of the quantity resistance is an italicised upper-case 'R'.
What is the formula for electrical resistance?
Resistance(Ohms)= Voltage(volts)/Current (Ampheres) -X
What is the formula for conductivity?
1/specific resistance
