Hi, everyone, i am new here. According to CSA requirement:" 1.10.2 A system, unless constructed so it will not
burst due to expansion of the refrigerant when subjected
to abnormal outside temperatures, such as those
generated by a fire, shall be protected by one of the
following types of pressure relieving devices:

a. A safety valve having a 1/4-inch (6.4 mm)
outlet;

b. A rupture member having an outlet not less
than 1/16 inch (1.6 mm) in diameter; or

c. A fusible plug having a maximum fusing point
of 280 F (138 °C) and an outlet not less than
1/16 inch (1.6 mm) in diameter. "
We are following the C option. Consul and dometic are doing in different ways.Can anybody explain how to do this? Our questions:
1, When to weld the fusible plug into cooing unit? Before or after passivation/ painting?
2, if before passivation, will the oven temperature melt the alloy?
3, If after passivation, how to treat the pipe inside of fusible plug?