What is a secondary seal?
A secondary seal is a seal that is designed to prevent the passage of process fluids at the pressure it will be subjected to upon failure of the primary seal.
It is not the same as conduit or cable seal.
What is the Intent of installing secondary seals?
The intention of secondary seals it to prevent the flow of flammable fluids from devices connected directly to process fluid in the event that the primary seal fails.
With one of its sides in contact with the process fluid, a secondary seal isolates process fluids from an electrical system.
New Code Requirements:
Canadian Electrical Code Rules 18-092(1), 18-108(1), 18-158(1):
"Secondary seals shall be provided, between devices containing a primary seal and conduit or cable seals, where failure of a single component in the device containing the primary seal could allow passage of process fluids."
  Download Electrical Safety Standards (PDF 39,0 kB)
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