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 ELECTRICAL
Determine if preventive maintenance inspections are adequate.
SWITCHES LOCKED OUT. USE GROUNDING HARNESSES ON INPUT TER-
MINALS. Before inspection, make arrangements to have electricians and other re-
quired labor available. Note: Inspections described in the Energized section are to be
performed as part of this inspection. Check for:
n Bushings and Insulators:
grease
dirt
other foreign materials
improper oil level in oil-filled bushings
n Insulators and Porcelain Parts: Report for investigation by a qualified
electrical engineer any chipped glaze exceeding 1/2 inch in depth or an
area exceeding one square inch on any insulator or insulator unit:
cracks
checks
chips
breaks
where flashover streaks are visible, reexamine for injury to glaze or
for presence of cracks
severe cracks, chipped cement, or indications of leakage around
bases of joints of metal to porcelain parts at terminal and
transformer ends
n Terminal Ends:
mechanical deficiencies
looseness
corrosion
damage to cable clamps
n Connections:
heating evidenced by discolorations
looseness
frayed or broken strands
7-9
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