Answer / ssreenu

megger value varies based on voltage of the system. If I
assume it is a 440 Volts system the megger value should be
min. 1 mega ohm.

Answer / brajesh kumar singh

Megger Value (in Meg Ohms) = (system Voltage + 1)/ 1000

Answer / akshay grover

Megger guys say, the value shall be


Megger Value (in Meg Ohms) = (system Voltage + 1)/ 1000

Answer / imran

Magger value must be more than 2 mega ohm minimum..

Answer / keith

If you need it to keep working, such as a sewage or storm
water pump,most reputable companys would trend the readings
beginning with the date the started servicing the motor and
watch for a dramatic decrease in test readings. One has to
be aware of the capacitance effect that water has on the
motor cable of a submersible pump as well as understanding
that it is normal to see a gradual decrease over a several
year period from above 200 megaohms @ 500 VOLT d.c. ( brand
new)to eventually down to 10 to 20 mega ohms. I have found
that although motors will run down to 2 mega ohms 230 volt
3 phase and 1 mega ohm to .6 mega ohms 480 3 phase they
don't run much longer. More important is to recognize
dratic decreases between monthly to quarterly readings as
they indicate potential failure ( direct short to ground)
which could trip main distribution breakers, thereby
effecting other motors or equipment by robbing them of
power. i.e. Alarm cicuits that are not battery back up
equipped.

Answer / mohammad nazeer

system voltage in kv plus 1kv. if a motor system voltage is
480-v, its megger value should be 1.48megga ohm.

Answer / dhamodaran.j

R>= (rated motor voltage/1000 +1)*10 (M ohm)

Answer / v. srinivasa rao

It is depending on megger voltage if it is 1000 v megger the
equipment must be 100 M Ohm minimum value it is 5000 v ht
megger it must be 10 G Ohm minimum value.

Answer / gins

More than 50mega ohms say that reference saramco check list
for megger test and for a hipot test this range will be more
than 100micro ampere.

Answer / khan

there are some standard meggar values for transformers lt/ht
motors cable.

For polarity test on a 11/3.3kV 2.5MVA delta-star Unit Auxiliary transformer,415V 3-phase supply was applied at the HV. Connection between Aa was made with a 2.5mm cable. As soon as power was switched on the cable caught fire and burnt. This test was then abandoned. It is noteworthy to say that a similar cable was also used in a similar transformer for the same. The cable did not burn and test was successfully completed with good result. What is wrong? Please, help me out.

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