When using flexible hose strings, one length only of hose without internal bonding
(electrically discontinuous) may be included in the hose string as an alternative to using the
insulating flange (see Section 17.5.2). All other hoses in the hose string should be
electrically bonded (electrically continuous). Since electrical continuity can be affected by
any of the physical hose tests, a check on electrical resistance should be carried out prior
to, during and after the pressure tests.
Electrically discontinuous hose should have a resistance of not less than 25,000 ohms
measured between nipples (end flange to end flange). The testing of electrically
discontinuous hoses should be carried out using a 500 V tester.
Electrically continuous hoses should not have a resistance higher than 0.75 ohms/metre
measured between nipples (end flange to end flange).