Table of Contents
a fitting that is attached to a service entrance mast, which provides a location for the attachment of the service drop conductors in an overhead service entrance. Rain-Tight. constructed or protected so that exposure to a beating rain will not result in the entrance of water under specified test conditions.
What is a service mast?
A service mast is the metal pole that rises through your roof or affixes to the exterior of your home. It connects directly to your exterior meter box. Service masts protect large cables called “service entrance conductors” that transfer power from the exterior supply to your home’s power meter.
What are the 2 types of service entrance?
There are two types of overhead service drops, mast, and clevis.
What is a mast on a house?
The service mast contains the wires that transfer power from the city’s overhead power distribution system to your home. In other words, the mast is the bridge between your home and your power supply. It’s responsible for introducing all of the voltage your electrical system uses into your home system.
Which of the following systems are allowed to be attached to a service mast?
Only power service-drop or overhead service conductors shall be permitted to be attached to a service mast.
Who is responsible for the service mast?
The utility company is only responsible for the power cable that extends from the power pole to the point of service on your home or business. If the point of attachment is the service mast (metal pipe coming out of the meter can), then the repair is the home owner’s responsibility.
How high does a service mast have to be?
The service mast should not be more than 3-feet vertically above the roof line; most utilities will require bracing or guy wires for additional support of any mast that is taller than 3-feet.
What’s the difference between ser and SEU cable?
Basically, SER is a round service electrical cable that typically has up to four conductors and a bare neutral. The cable is designed to use above the ground in feeder panels and branch circuits. SEU is an unarmored Style U flat service electrical cable with two-phase conductors and a concentric neutral.
What is the meaning of service entrance?
The service entrance, as the name implies, is where the wires connected to the load side of the meter enter the house or building. The service entrance in a residence is commonly thought of as a breaker or fuse box.
Where is type SE permitted?
Type SE service-entrance cable shall be permitted for use where the insulated conductors are used for circuit wiring and the uninsulated conductor is used only for equipment grounding purposes.
What is a power mast?
What is an electrical mast and meter box? With aboveground wiring (a service drop), the energy enters your home with a metal pole called an electrical mast. The electrical mast connects to a meter box to determine how much energy your home uses and to communicate this with your local power utility company.
What type of wire is used for overhead service?
SE-U is most commonly used for service entrance applications, to connect the meter socket to the main breaker panel. It is also commonly used for overhead service drop applications, to connect the overhead service cable to the meter socket.
What are the 3 wires from pole to house?
The service drop leads from the utility pole lines to a home. It is made up of three conductor wires. Two of them are insulated wires that carry electricity from the transformer; the third is a bare neutral wire that connects to the grounding wire. These lines have a voltage of 120 to 240 volts.
Can the service entrance disconnecting means be installed in a bathroom?
The service disconnecting means is not permitted to be installed in a bathroom. Overcurrent devices must not be located in the bathrooms of dwelling units, or guest rooms/guest suites of hotels or motels [240.24(E)].
Can you tap service entrance conductors?
Service-entrance conductors. Service-entrance conductors can be spliced or tapped per 110.14, 300.5(E), 300.13, and 300.15 [230.46]. While the NEC allows this, maintenance considerations often make this method inadvisable.
What are the support requirements for service entrance cable?
When used as a branch circuit or feeder, Type SE cable must be supported and secured in accordance with 334.30 at intervals not exceeding 4½ feet and within 1 foot of every outlet box, junction box, cabinet or fitting.
How far should power pole be from house?
If the voltage is 345Kv and above the rule is 15 feet. There are cases where the power lines cross over the top of a house with adequate vertical clearance. As far as the pole is concerned, the codes are only interested in energized parts.
How is power connected to a house?
The electricity leaves the power station, usually through overhead lines, and makes its way to a large substation. The electricity then leaves the first substation via overhead power transmission lines supported by pylons, or via underground cables.
How is electricity connected to a house?
The electrical charge goes through high-voltage transmission lines that stretch across the country. It reaches a substation, where the voltage is lowered so it can be sent on smaller power lines. The electricity travels through wires inside the walls to the outlets and switches all over your house.
Does service wire have to be in conduit?
(1) Service-Entrance Cables. So, you’ll either need to have this service-entrance re-run with a conduit, or see if you can get your local electrical inspectors to sign off on using bollards (i.e. concrete-filled metal poles) to protect the meter pan and service cabling as Machavity suggests.
What is point of attachment electrical?
In electricians’ talk, the Point of Attachment or PoA is the point where the wires from the street attach to a building and now with the windy season approaching it’s more serious.
How high off the ground should electrical wires be?
According to the National Electrical Safety Code, telephone lines must be at least 14 feet above the ground and electrical lines must be at least 15-½ feet above the ground.
