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ble and combustible.
(1) The measurement of grounding resistance of tanker and upl-
oad and load place
As show above, in system of gas station, oil tank grounding
pole A connect with tanker, the grounding pole C of load and
upload position is a independent grounding pole. Find a inde-
pendent grounding pole as an auxiliary grounding pole B (like
the water piper), then base on Three point method to mea-
surement R
1
, R
2
and R
3
.
The grounding resistance of oil tank: RA=(R1+R2+R3)/2
The grounding resistance of load and upload place:
RC=R2-RA
The grounding resistance of auxiliary grounding pole:
RB=R1-RA
NOTE: Cannot connect BC and AC by wires when measuring
R
1
; the same as R
2
, R
3
.
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