PR S 40024 Flashcards
Vital Signalling Relays
1
Q
how long can a relay be sitting on a shelf before placed into service
A
Q, HVI, PN150 - 7 years
DC , B type - 5 Years
VT1, A.C, Electro mechanical/ thermal time limit relays - 3 years
2
Q
How is a timer relay adjusted
A
In a relay test panel and then tested in situ.
Within 10% of design.
