Although not as strong as iron, asbestos cement, because of its corrosion resistance and ease of installation, is a desirable material for secondary feeders up to 41 cm (16 inches) in diameter.
Ductile iron, a stronger and more elastic type of cast iron, is one of the most common materials now used for smaller underground pipes (secondary feeders), which supply water to local communities.
The pipeline system of a municipal water distribution network consists of arterial water mains or primary feeders, which convey water from the treatment plant to areas of major water use in the community, and smaller-diameter pipelines called secondary feeders, which tie in to the mains.
Rackspace then attempted to switch to our secondary utility feeder, but was unable to do so due to an issue in the Pad Mounted Switch (PMS).
In this figure, the primary side of the main traction transformer MTT AB is connected to phase A and phase B of a utility grid, where ( U_{AB} ) is the line voltage, and the secondary side feeder F ab supplies power for one line.
Similarly, the primary side of the main traction transformer MTT BC is connected to phase B and phase C of a utility grid, where ( U_{BC} ) is the line voltage and the secondary side feeder F bc supplies power for another line.
To maintain the OTBCs in self-renewal conditions in feeder-free cultures, colonies from secondary passages of feeder cultures were then propagated in mammosphere media in low non-adherent plates, which are culture conditions known to expand mammary stem and progenitor cells [ 8].
OTBCs were picked between 21 and 28 days after seeding on MEFs and transferred to secondary and tertiary feeder cultures.
5) Size of the lesion and its relation to primary, secondary or quaternary feeders.
