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IM-PP 724607 1218 ProPress
2.5.2 Expansion
Thermal expansion in installed systems generates stress on tubing and
appliance connectors. Compensation must be allowed for expansion
and contraction that may occur within the tubing. Expansion joints or
mechanical expansion compensators may be used to alleviate these
stresses. ProPress systems do not require any additional protection when
compared to a soldered system.
The following methods are eective:
■ Fixed and sliding hangers
■ Expansion equalization joints (expansion bends)
■ Expansion compensators
2.5.3 Electrical Bonding
When properly installed, ProPress ttings comply with Section 1211.15
Electrical Bonding and Grounding of the Uniform Plumbing Code and
Section 310 of the International Fuel Gas Code.
The mechanical press provides continuous metal-to-metal contact
between tting and tube. The press ensures the continuity of the bonding
through this contact.
A qualied electrician is responsible for ensuring electrical
bonding is tested and secured.
DANGER!
Electric Shock
An electric shock can cause burns, serious injury, and
even death.
■ Because all metallic tubing can conduct electricity,
unintentional contact with a live wire can lead to
the entire system and components connected to it
to become energized. Metal piping is not meant to
conduct electricity.
■ A properly bonded system creates a safe path for
electricity to travel so that the system can't be energized.
■ An unbonded or improperly bonded system can be a
shock hazard.
■ Always ensure bonding is in accordance with local codes.
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