A standby generator is permanently installed outside the property and is designed to provide backup electricity when utility power is interrupted. Depending on the generator and property, these systems commonly operate on natural gas or propane.

Unlike a portable generator that needs to be manually set up and fueled, a permanently installed standby system can be configured to start automatically during a power outage.

For the generator to operate reliably, however, the fuel system must be properly planned. The gas piping must be appropriate for the generator’s fuel requirements while also accounting for other gas appliances connected to the property.

That can include:

• Generator fuel requirements
• Natural gas or propane supply
• Length of the gas piping run
• Existing pipe size
• Other gas appliances in the home
• Available gas pressure and capacity
• Generator location
• Required shutoffs and connections
• Manufacturer installation requirements
• Applicable plumbing and fuel-gas requirements

Fuel-line requirements vary by generator model and installation. Generator manufacturer guidance also notes that fuel piping must be sized based on factors such as fuel type, generator demand, and the distance between the fuel source and generator.

For additional generator safety information, homeowners can review the Massachusetts generator safety guidance.

Generator Gas Line Installation

Pierce Plumbing installs gas piping for permanently installed standby generators throughout Cape Cod.

The plumbing portion of a generator project should be planned around the requirements of the specific generator being installed rather than assuming an existing gas line is adequate.

Before installing the fuel connection, we can evaluate factors such as:

• Generator make and model
• Required fuel type
• Generator fuel demand
• Existing gas piping
• Available natural gas or propane supply
• Length and route of the proposed piping
• Existing gas-fired appliances
• Generator location
• Access for installation
• Shutoff and connection requirements

New gas piping can then be installed as appropriate for the project.

Generator electrical wiring, transfer switches, and other electrical components should be completed by the appropriately licensed electrical professional.

Natural Gas Generator Connections

For properties with natural gas service, a standby generator may be connected to the home’s natural gas supply.

The existing system needs to be evaluated before simply extending a gas line to the generator. A generator can represent a substantial additional fuel demand, particularly when other equipment such as boilers, furnaces, water heaters, fireplaces, ranges, or pool heaters also use natural gas.

Depending on the property and generator requirements, the project may involve:

• Installing a new generator gas line
• Extending existing gas piping
• Evaluating existing pipe sizing
• Installing required valves and connections
• Reviewing other connected gas appliances
• Determining whether modifications to existing piping are necessary
• Connecting the fuel piping to the generator

Proper planning helps make sure the generator receives an appropriate fuel supply when it is called on to operate.

Propane Generator Connections

Natural gas is not available at every Cape Cod property. Many standby generators can instead operate using propane.

Pierce Plumbing provides propane piping and generator fuel connections for properties using an appropriate propane supply.

A propane generator installation may require consideration of:

• Generator fuel requirements
• Propane supply configuration
• Location of the generator
• Distance between the fuel source and generator
• Required pipe sizing
• Regulators and operating pressure
• Shutoff valves
• Other propane appliances at the property
• Manufacturer installation requirements

The specific setup depends on the generator, fuel system, and property.

Why Install a Standby Generator?

Automatic Backup Power

A permanently installed standby generator can be configured to start automatically when utility power is interrupted, helping restore power without the manual setup required with a portable generator.

Keep Important Home Systems Operating

Depending on the size and design of the generator system, backup power may help keep important equipment operating during an outage, including:

• Heating systems
• Refrigerators and freezers
• Well pumps
• Sump pumps
• Lighting
• Internet equipment
• Selected appliances
• Security equipment
• Air conditioning or mini-split systems

Which systems can operate simultaneously depends on the generator capacity and electrical design.

Protection During Cape Cod Winter Outages

Losing electricity during cold weather can create more than an inconvenience.

If a home relies on electricity for heating equipment, well pumps, controls, or other essential systems, an extended outage can create additional problems for the property.

A properly designed standby generator can provide another layer of preparedness during winter storms and other utility interruptions.

Useful for Vacation and Second Homes

Backup power can be particularly valuable for Cape Cod properties that are not occupied year-round.

An automatic standby system may be able to keep selected critical systems operating when nobody is at the property to manually start a generator.

This can be especially useful for homes where heating, sump pumps, well equipment, security systems, or other equipment needs to remain operational.

Natural Gas or Propane Options

Many residential standby generators are designed to operate on either natural gas or propane, giving property owners options based on the fuel available at the property.

The appropriate fuel arrangement depends on the generator, existing infrastructure, property conditions, and installation requirements.

Permanent Installation

Unlike portable generators, standby systems become a permanent part of the property.

That makes proper planning important. Generator location, electrical work, fuel piping, clearances, service access, and manufacturer requirements should all be considered before installation begins.

Planning for a generator during construction or a major renovation can make it easier to determine the gas-line route, generator location, and other installation requirements before walls, landscaping, and finished surfaces are completed.

Pierce Plumbing can provide generator fuel piping as part of a larger plumbing project for:

• New Cape Cod homes
• Major renovations
• Home additions
• Vacation properties
• Replacement homes
• Light commercial projects

Early coordination between the plumber, electrician, generator installer, propane provider or natural gas utility, and other contractors can help keep the different parts of the installation properly planned.

Generator Installation Safety

Generator installations involve both electrical equipment and a fuel-burning engine, so they should be completed according to applicable requirements and the equipment manufacturer’s instructions.

Massachusetts provides generator safety information for homeowners, including guidance related to carbon monoxide, fire, and electrical hazards.

Generator exhaust produces carbon monoxide, which is why generator location and manufacturer-required clearances are important.

Never operate a portable generator inside a house, garage, basement, crawl space, shed, or other enclosed area. The U.S. Consumer Product Safety Commission recommends operating portable generators outdoors and at least 20 feet from a home, with exhaust directed away from the building.

Important: Portable-generator safety recommendations should not be used as a substitute for the installation instructions and required clearances for a permanently installed standby generator. Follow the requirements for the specific equipment being installed.