In California seismic zones, flexible gas connectors for water heaters must comply with which specific requirement?
Correct Answer
C) Maximum length of 6 feet with earthquake shut-off valve
California Plumbing Code Section 507.2.2 requires flexible gas connectors to water heaters be limited to 6 feet maximum length and include an earthquake shut-off valve in seismic zones. This California-specific requirement addresses seismic safety concerns and helps prevent gas leaks during earthquakes that could cause fires or explosions.
Why This Is the Correct Answer
California Plumbing Code Section 507.2.2 requires flexible gas connectors to water heaters to be no longer than 6 feet AND include an earthquake shut-off valve (also called a seismic shut-off valve or excess flow valve) in seismic zones. The 6-foot limit prevents excess slack that could contact hot surfaces or be damaged, while the earthquake shut-off valve automatically stops gas flow if seismic activity causes a dangerous leak — a California-specific safety requirement not found in the national standard.
Why the Other Options Are Wrong
Option A: Maximum length of 3 feet
A maximum length of 3 feet is too restrictive and not the California code requirement. The actual limit is 6 feet. A 3-foot connector would also be unnecessarily difficult to install in many water heater configurations without creating sharp bends.
Option B: Maximum length of 6 feet with sediment trap
While 6 feet is the correct maximum length, a sediment trap is a requirement for gas appliances related to the gas line itself (to catch debris), not the California seismic-specific requirement. In seismic zones, the critical addition is the earthquake shut-off valve, not a sediment trap at the connector.
Option D: Maximum length of 4 feet with both earthquake shut-off valve and sediment trap
The 4-foot length is incorrect (California allows up to 6 feet). While including both an earthquake shut-off valve and a sediment trap is not wrong from a safety perspective, it is not the specific code combination required. The California Plumbing Code specifies 6 feet with an earthquake shut-off valve — not 4 feet with both devices.
Memory Technique
Remember '6-foot Earthquake Valve': flexible gas connectors in California seismic zones get 6 feet of length and must have an earthquake shut-off valve. Picture a 6-foot connector with a valve that slams shut during a quake — that's the California standard.
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