-34- This document, and the opinions, analysis, evaluations, or recommendations contained herein are for the sole use and benefit of the contracting parties.
There are no intended third party beneficiaries, and Jacobs Consultancy shall have no liability whatsoever to third parties for any defect, deficiency, error,
omission in any statement contained in or in any way related to this document or the services provided.
Table 4 - Circuit Inspection Program
Type of Inspection Facilities Inspected
Cycle
Length
Complete overhead
circuit inspection and
attachment survey
Subtransmission and distribution
circuits. All foreign company
attachments. Check clearances for
NESC compliance.
4 years
Inspections by tree
trimmers
Subtransmission and distribution
circuits and all associated hardware
4 years
Subtransmission circuits Subtransmission circuits 2 years
Aerial infrared inspections Subtransmission circuits as needed
Pole inspection and
treatment
Subtransmission and distribution
circuits
12 years
Capacitor inspections Capacitors 1 year
Regulators inspection /
reading
Voltage regulators 6 months
Line recloser inspection /
reading
Line reclosers 6 months
UG network inspections Network transformers and protectors 1 year
Field personnel as-found
reports
All facilities Items reported as found
o National Electrical Safety Code Corrective Action Plan—A complete circuit
inspection identifying all NESC and reliability deficiencies will be conducted on all
Illinois distribution circuits from 2008-2011, with all corrective actions to be
completed by 2012. In addition, a ground line inspection will be conducted
annually on all poles on circuits identified that year for inspection. Corrective
actions will be completed based on AmerenCIPS’ National Electrical Safety Code
Corrective Action Plan filed with the ICC.
o Circuit Breaker Maintenance—Oil circuit breakers (OCB) operating at less than
34.5 kV are serviced every 36 months; this includes contact resistance tests, oil
dielectric tests, operations checks and mechanism lubrication. These breakers
are overhauled every 108 months or after 12 full fault trips. OCBs for capacitor
bank switching are inspected every year. Other breaker types, including sulphur-hexaflouride
(SF6), air blast and vacuum are maintained on a 1-5 year basis
depending on type.
o Recloser Maintenance—Single-phase reclosers are replaced every 5 or 10
years for oil or vacuum, respectively, and removed units are refurbished for re-use.
Three-phase reclosers are serviced every 3 or 6 years for oil or vacuum,
respectively. Internal inspections may be triggered more frequently depending
on performance.
