> Important rule for safety & Earthing practice is based on IE RULE 1956 .
RULE 35 > Warning plate
if voltage is above 400 v there should use warning plate .
RULE 44 > Penality of interferance with meter
first aid equipment in every building
RULE 49 > Leakage current in a cable should not above 1/5000 of full load current
RULE 33 > Supplyer should be provided with earthing for consumers .
RULE 54 > % change in voltage at consumer end
(LOW) max voltage varition = +_ 6%
for hoigh voltage = +_ 6 to 9 %
for extra high voltage = +_ 10 to 12.5 %
According to IE RULE voltage level
low voltage = 0- 250V
Medium voltage = 250 - 650 V
High voltage = 650 to 33 KV
Extra high voltage = 33 KV - 132 KV
Super extra HV = > 132 KV
Permissible voltage drop in lighting circuit
= 2% of supply + 1V
RULE 55 > % Change in frequency at consumer end declared frequency of supply to consumer max = +_ 3%
UPPCL Q. - MAX PERMISSIBLE FLUCTATION =1%
RULE 61 > Connection with earth
> if voltage is greater then 125 V there should be earthing point
RULE 46 > Where an installation is alrady connected to the supply system of supplier , every such installation shall be periodically inspected and tested at interval not exceding 5 years either by inspector or officer .
RULE 77> Clearence above ground of lower conductor
parallel with road - lv &hv = 18 ft
hv & ehv = 19 ft
cross the road - lv & hv = 19 ft
hv & ehv = 20 ft
RULE 79 > Clearence from building of low medium voltage lines & service line