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RESIDENTIAL SERVICE REQUIREMENTS

CHAPTER 3 - OVERHEAD SERVICE


GENERAL REQUIREMENTSFIGR8.GIF (10923 bytes)
If you wish to have an overhead service to your home, the information in this chapter will help you.

The following is a checklist that will assist you in preparing your project for the installation of your overhead service. After you have completed these items, CLPUD will install your service line and meter (see Figure 8). The following items must be completed before CLPUD will install your new service line (in addition to those in the Overview section):

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GETTING STARTED
After you have completed your Customer Request For Service, CLPUD will contact you to arrange an appointment at the site. At this time the location for the meter base and service line will be determined.

Again, your meter base should be located outside, and within 4 feet of the front of your structure closest to normal public access and the pole (see Figure 3).

Another factor to consider when choosing the meter base location is what types of terrain the line will be crossing. CLPUD suggests that whenever possible you avoid service lineFIGR10.GIF (8748 bytes) routes that will cross your driveway. Service lines crossing driveways can be hit by vehicles and cause damage to your service equipment and even your home.

If your service line will be passing through any trees, you are required to prune those trees to provide a 3 foot minimum clearance on all sides of the service line. Your are also responsible for regular tree pruning, and if necessary, tree removal to keep the path clear.

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SERVICE MAST REQUIREMENTS
A service mast is a conduit that runs vertically from the top of your meter base up through your roof. It contains your service entrance conductors and typically supports one end of your service line. Service masts are necessary when installing an overhead service and are installed by you or your electrical contractor.

The requirements for the installation of your service mast are located in the NEC. Some of the more common methods are included in this section for your information.

HEIGHT REQUIREMENTS:
The top of your service mast must be a least 13 feet above final grade so that the minimum clearances over your property can be maintained. Additional height may be required depending upon the location and type of structure or terrain which your service line passes over. Figure 9 illustrates some of the minimum clearances that must be maintained.

The NEC and CLPUD also require that your service mast maintain minimum clearances above your roof. The clearance required depends upon the slope of your roof, and whether or not your service line is attached to the structure. Figure 10 is one example of a service mast installation with the service line attached to the mast. This is the method preferred by CLPUD. For other options and details, consult the NEC.

Service lines passing over the roof of another structure must meet the clearances shown on Figure 11.FIGR11.GIF (11068 bytes)

CLPUD can assist you in determining your proper mast height. Call our nearest service office, and ask to speak to an engineering technician.

CLEARANCES FROM BUILDINGS, OPENINGS, GAS:
A minimum clearance of 5 feet is required between service lines and windows, doors, porches, fire escapes, or similar openings.

A minimum horizontal clearance of 3 feet is required between electric service equipment and natural gas metering equipment (see Figure 11).

ADDITIONAL MAST SUPPORTS:
Additional mast supports, typically a guy or brace, are required for any service line that is over 50 feet in length. Guy and braces are installed to prevent the weight of the service line from pulling your service mast away from your home. Further information regarding guying and bracing service masts is available in the
FIGR12.GIF (8655 bytes)NEC.

Additional mast supports are required when:

See Figure 12 for an example of a service mast guy.

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SERVICE EQUIPMENT INSTALLATION REQUIREMENTS
After you have determined the meter base location, the service route, the height of your service mast, and the size of your service equipment (200 amp, 400 amp, etc.), you are ready to begin installing your service equipment.

There are two ways this equipment can be installed:

Once you have installed your meter base and mast you are ready to provide and install
your service entrance conductor. The service entrance conductor is the wire that is connected to the top lugs in your meter base and runs upwards through the service mast. The service entrance conductors must be sized according to the NEC and to the rating of your meter base. When installing the wire, leave at least 18 inches of it exposed at the end of the weatherhead to allow CLPUD to connect your service line to it. When you install your meter base make sure the center of the meter will be between 5 and 6 feet above finished ground level.

If you have any questions regarding the installaFIGR13.GIF (12292 bytes)tion of your service equipment we suggest that you consult the NEC, call the inspecting agency for your area, or contact an electrical contractor.

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MANUFACTURED HOMES
If you are installing an overhead service to your manufactured home, your service equipment may be installed in one of two ways:

1. On a customer-owned meter pole, or;

2. On the manufacturer installed home, if the following conditions are met:

Meter bases installed on manufactured homes must:

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CUSTOMER-OWNED METER POST
If a meter post is required for your project, it is your responsibility to purchase and install it. Your post must meet or exceed the following requirements:

See Figure 15 for an example of a meter post installation.

Meter Post Depth
Pole Length
Overall
Proper Depth
in Ground
17’-19’ 4’-6"
20’-25’ 5’-0"
26’-35’ 5’-6"

Your meter post has the same location requirements as your meter base (see Chapter 1 - Meter Location). However, they may be located closer to vehicular traffic with approval of your PUD Engineer. Typically they are installed within 30 feet of your home.

For additional assistance on meter post installations, contact your nearest CLPUD service office, and ask to speak to an engineering technician.

CIRCLE.GIF (1025 bytes) Items owned and installed by the customer (Figure 15)

1. A 6" x 6" x 16’ minimum, continuous, single structure, pressure treated, firmly set .

2. Meter base with ground wire from the meter base to service neutral and an electrical permit or "green tag" attached.

3. Ground wire (per NEC) with ground wire connected to theFIGR15.GIF (12519 bytes) meter base or switchbox lug and grounded to both ground rods with approved cast clamp.

4. Ground rods (per NEC,2 required) 8’ long.

5. Down guy, 5/16 in. minimum, galvanized steel cable.

6. Service entrance conductors, 18" out of weatherhead.

7. Drill 11/16" hole 6" below top of pole in line with service drop.

8. Anchor.

SQUARE.GIF (1018 bytes) Items owned and installed by CLPUD (Figure 15)

9. Meter.

10. Service Line.

11. Insulated clevis.

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