At a pressure of 500 V applied between each live conductor and earth for a period of one minute, the insulation resistance of HV installations shall be at least:

At a pressure of 500 V applied between each live conductor and earth f

1.	At a pressure of 500 V applied between each live conductor and earth for a period of one minute, the insulation resistance of HV installations shall be at least:
A.	0.5 kilo ohm
B.	100 mega ohms
C.	1 mega ohm
D.	1 kilo ohm
Answer» D. 1 kilo ohm