UL 174:2019 pdf download.Household Electric Storage Tank Water Heaters.
7 Mechanical Assembly
7.1 An electrical component shall be securely mounted in place.
7.2 A surface-mounted temperature control shall be:
a) Secured indirectly to the storage tank by a bracket so as not to be reaoy osplaced, as determined by the Mounting Test of Surface-Mounted Temperature Controls described in Section 31; or
b) Secured directly to the storage tank by positive fastening means such as screws or stud and nut. 8 AccessibIlity of Live Parts
8.1 A live electrical part of a water heater shall be so located or enclosed to reduce the risk of unintentional contact with an uninsulated live part.
8.2 An unmsulated live part shall not be exposed to contact by the user or service personnel adjusting the selling of a temperature-regulating thermostat, operating the resetting mechanism of a temperature- limiting control, operating a water drain valve, or performing a similar operation. This requirement applies even when the unit is marked as indicated in 48.1.
8.3 When a marking draws the attention of the user to an opening of any size for the insertion of a tool to adjust a thermostat, operate a reset mechanism, or any similar activity, the construction shall reduce the risk of contact with any uninsulated live part The construction complies with this requirement when a 1/16 inch (1.6 mm) diameter rod does not contact any uninsulated live part when inserted through such an opening.
8.4 A barrier provided to reduce the risk of contact with a live part as required in shall comply with all the following items. Thermal insulation shall not be employed for purposes of compliance with this requirement. The barner shal:
a) Be an electrical insulating material having a temperature rating of at least 90C (194F);
b) Be at least 1/16 inch (1.6mm) thick.
7.1 An electrical component shall be securely mounted in place.
7.2 A surface-mounted temperature control shall be:
a) Secured indirectly to the storage tank by a bracket so as not to be reaoy osplaced, as determined by the Mounting Test of Surface-Mounted Temperature Controls described in Section 31; or
b) Secured directly to the storage tank by positive fastening means such as screws or stud and nut. 8 AccessibIlity of Live Parts
8.1 A live electrical part of a water heater shall be so located or enclosed to reduce the risk of unintentional contact with an uninsulated live part.
8.2 An unmsulated live part shall not be exposed to contact by the user or service personnel adjusting the selling of a temperature-regulating thermostat, operating the resetting mechanism of a temperature- limiting control, operating a water drain valve, or performing a similar operation. This requirement applies even when the unit is marked as indicated in 48.1.
8.3 When a marking draws the attention of the user to an opening of any size for the insertion of a tool to adjust a thermostat, operate a reset mechanism, or any similar activity, the construction shall reduce the risk of contact with any uninsulated live part The construction complies with this requirement when a 1/16 inch (1.6 mm) diameter rod does not contact any uninsulated live part when inserted through such an opening.
8.4 A barrier provided to reduce the risk of contact with a live part as required in shall comply with all the following items. Thermal insulation shall not be employed for purposes of compliance with this requirement. The barner shal:
a) Be an electrical insulating material having a temperature rating of at least 90C (194F);
b) Be at least 1/16 inch (1.6mm) thick.
