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NDERGROUND
29
U
NDERGROUND
S
ERVICE
24
Overhead Service Details
Customer Service Pole and Outdoor Fitting
Items to consider
If your trenching route has
to be dug by hand, or if a cable
must be installed under a
paved surface, additional
charges apply.
If your service cable has to
be moved later to make room
for a new swimming pool,
patio, deck, etc., new charges
apply. Plan ahead!
Underground cable will be
buried only in a ComEd
easement or in the property
that it serves. Additional
charges apply if your
secondary service cable route
is longer than 100feet.
To avoid additional ComEd
charges - a customer can per-
form the following: can dig
their own trench, can install
their own cable per municipal-
ity requirements - note the
customer will then own and
maintain the cable, can com-
plete their own boring work
per municipality require-
ments, and can dig their own
splice pits.
There will be charges from
ComEd if you convert from
overhead to underground
service.
You are responsible for
making or exposing under-
ground sprinkler systems,
private wiring, sewers, drain
tiles, etc.
The trench route must
be within 4 inches of final
grade and clear of all obsta-
cles (sheds, swing sets,
tree stumps, landscaping,
fencing, etc.).
Generally, restoration of
landscaping is the customers
responsibility.
Conduit may be required
under roads/pavement or by
the municipality.
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23
Underground Service
Overhead Service Details
Steel Conduit Riser
Customer furnishes, installs and maintains:
Service head
Service run wires
(allow a minimum of 18 in. beyond the service head to
make connections to service drop wires)
Service attachment
Rigid steel conduit
(2-1/2 in. for 100 ampere or smaller, or 3 in. for
larger service entrance equipment)
2 in. x 4 in. blocking, solidly installed between rafters
Mounting clamp with 1/2 in. bolts, nuts and washers
Steel Conduit reducer
CECHA Meter fitting
ComEd furnishes, installs and maintains:
Service drop dead-end
Connectors for connecting customers wires
to service drop
Meter
1
2
3
4
5
6
7
8
9
10
11
Note:
All metal parts exposed to
weather shall be hot galva-
nized or non-ferrous.
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31
Overhead Service Details
Steel Conduit Riser
Glossary of Terms
Underground Equipment
Meter a device that measures the amount
of electricity used by a customer.
Upper protective cover of the meter fitting
Grounding connection.
Grounding electrode (ground rod).
Disconnecting means the main breaker,
fuse box or breaker panel inside your home.
Water pipe grounding connection a safety
connection to provide an electrical path to ground.
Conduit PVC pipe in which the service cable is installed.
Must be a mimimum of 3 in. schedule 40 or per local code.
1
2
3
4
5
6
7
Notes:
See pages 26-28 for impor-
tant clearances which must
be observed.
Check local codes for
requirements, such as conduit
requirements.
For grounding reference,
see page 47.
R1926 9/5/07 12:09 PM Page 24 32
21
Underground Metering
Underground Meter Fitting and Raceway
Overhead Service Details
Wood Riser
Customer furnishes, installs and maintains:
Service head
Service run
Service run wires
(allow a minimum of 18 in. beyond the service head to
make all connections to service drop wires)
4 in. x.4 in. or 6 in. x 6 in. preservative treated wood post
2 in. x 4 in. blocking solidly installed between rafters
5/8 in. galvanized mounting bolts
(with nuts and washers)
CECHA Meter fitting
Service attachment
ComEd furnishes, installs and maintains:
Service drop dead-end
Connectors for connecting customer wires to service drop
Meter
1
2
3
4
5
6
7
8
9
10
11
R1926 9/5/07 12:09 PM Page 23 20
33
Overhead Service Details
Wood Riser
Underground Metering
Underground Meter Fitting and Raceway
Single-Phase, Three-Wire 120/240 or
120/208
Volts, 200 Amps Maximum Rating
Customer furnishes, installs and maintains:
Single position combination meter fitting and raceway
(200 amps maximum per meter position)
Meter socket load wire terminals
Neutral terminal
Fifth terminal with potential tap ( # 12 copper wire or
equivalent) from neutral terminal (120/208 volt service only)
Ground connection per local code
Compression lug connectors for phase and neutral
cables**
Horn type bypass
ComEd usually furnishes, installs and maintains:
Underground secondary service cables
(slack in cables of at least 12 in. must be provided)
ComEd furnishes, installs and maintains:
Meter
1
2
3
4
5
6
7
8
9
Notes:
*See pages 39 and 43 for
some exceptions.
Raceway also available with
factory installed main circuit
breaker.
Meter fittings must be CECHA
approved.
**Customer to install lugs
only when secondary service
cables are provided by the
customer.
For overhead to underground
installations, ComEd will
supply cable protection on
pole at customers expense.
R1926 9/5/07 12:09 PM Page 22 Underground Metering
Class 320 Meter Fitting and Raceway
Overhead Service Attachment
Roof Plate
Customer furnishes, installs and maintains:
Roof plate
Service head
(if the service run extends through the roof, the service head
shall be so located that it is 6 in. on either side of the service
drop and extends 18 in. above the roof.)
Service run
Service run wires
(allow a minimum of 18 in. beyond the service head to
make connections to service drop wires)
ComEd furnishes, installs and maintains:
Service drop dead-end
Connectors for connecting customers wires to
service drop
1
2
3
4
5
6
34
19
R1926 9/5/07 12:09 PM Page 21 18
35
Overhead Service Attachment
Roof Plate
Underground Metering
Class 320 Meter Fitting and Raceway
Single-Phase, Three-Wire 120/240
400
Amps maximum rating
Customer furnishes, installs and maintains:
Combination meter fitting and raceway with
lever-actuated bypass
Compression lug connectors for load conductors
Neutral terminal
Ground connection, per local code
ComEd usually furnishes, installs and maintains:
Underground secondary service cables with
compression lug connectors. Slack in cables of at least
12 in. must be provided
ComEd furnishes, installs and maintains:
Meter
1
2
3
4
5
6
Note:
*See pages 39 and 43 for
some exceptions.
Raceway also available with
factory installed main circuit
breaker.
Meter fittings must be CECHA
approved.
For overhead to
underground installations,
ComEd will supply cable
protection on pole at cus-
tomers expense.
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17
Underground Metering
Meter Connection for Mobile Home
Overhead Service Attachment
Fork Bolt and I-Plate
Customer furnishes, installs and maintains:
Service head
Service run
Service run wires
(allow a minimum of 18 in. beyond the service head to
make connections to service drop wires)
Service attachment
ComEd furnishes, installs and maintains:
Service drop dead-end
Connectors for connecting customer wires to service drop
For an existing structure where it is impractical to install
a fork bolt, the customer should install an I-plate.
I-plate
Customer to securely install I-plate
Service wire
A 4 in. to 18 in. clearance (in any direction) must be
maintained between the service head and the center of
the service attachment
1
2
3
4
5
6
7
8
9
10
Note:
Under no circumstances
shall a service attachment be
made to a parapet or a
chimney. The service head
and attachment shall be
located so that:
a.) The exposed wires will
adequately clear all building
components including down-
spouts, gutters, etc., and
b.) The wires will be out of
reach from windows, porch-
es, or any other parts of the
building that are accessible to
the occupants or the public.
R1926 9/5/07 12:09 PM Page 19 16
37
Overhead Service Attachment
Fork Bolt
I-Plate
Underground Metering
Meter Connection for Mobile Homes
Single-Phase, Three-Wire 120/240 or 120/208
Volts, 200 Amperes Maximum Rating
Customer furnishes, installs and maintains:
Combination meter fitting, raceway and pedestal
(200 amperes maximum)
Meter connection device
Enclosure for disconnecting device and receptacles
Block for terminating secondary service cables
Conductors or bus extending from terminating block
to meter socket line terminals
Stabilizer foot (#10 gauge metal) or
9 in. x 12 in. x 15 in. concrete anchor
Ground connection, per local code
ComEd usually furnishes, installs and maintains:
Underground secondary service cables with compression
lug connectors. Slack in cables of at least 12 in. must be
provided
ComEd furnishes, installs and maintains:
Meter
1
2
3
4
5
6
7
8
9
Note:
Raceway also available with
factory installed main circuit
breaker.
Meter fittings must be CECHA
approved.
For overhead to underground
installation, ComEd will sup-
ply cable protection on
pole at customers expense.
R1926 9/5/07 12:09 PM Page 18 Underground Service
Customers Cable Pole
38
15
Overhead Metering
Self-Contained Outdoor Class 320
Single Position Meter Fitting
Single-Phase, Three-Wire 120/240 Volts
Customer furnishes, installs and maintains:
Meter connection device with lever actuated bypass
(320 amperes maximum)
Conduit and conductors (line)
Conduit and conductors (load)
Ground connection per local code
In