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 MIL-HDBK-419A
POWER
SERVICE TRANSFORMER
MAIN SERVICE
DISTRIBUTION
SECONDARY
DISCONNECT MEANS
PANEL
TO
EQUIPMENT
EQUIPMENT
GROUND BUS
NOTE l
GROUND ROD (P/O EARTH
ELECTRODE SYSTEM)
LINE-TO-GROUND
PHASE ARRESTER
(3 EACH)
I
LINE-TO-LINE
ISOLATE FROM
PHASE ARRESTER
ENCLOSURE
(3 EACH)
NOTES:
NOTES 2, 3
GROUND ROD
1.
NO. 4 AWG MINIMUM, STRANDED COPPER, INSULATED, COLOR CODED.
(P/O EARTH
SHORT, DIRECT CONNECTIONS WITH NO SHARP BENDS.
ELECTRODE SYSTEM)
2.
NO. 2 AWG MINIMUM, STRANDED COPPER, INSULATED.
SHORT, DIRECT CONNECTION WITH NO SHARP BENDS.
3.
CAN BE CONNECTED TO GROUND BUS IN MAIN SERVICE
DISCONNECT MEANS.
Figure 1-37. Secondary AC Surge Arrester Installation, Ungrounded Service
l-62
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