03: 35 Safety Services (52)

Question 1

The following sources for safety services are recognized (351.1 p.52, 560.6.1 p.224)

a) Storage batteries
b) Primary cells
c) Generator sets independent of the normal supply
d) All of the above

Answer 1

d) All of the above

351.1 p.52
The following electrical sources for safety services are recognized:
(i) Storage batteries
(ii) Primary cells
(iii) Generator sets independent of the normal supply
(iv) A separate feeder of the supply network that is effectively independent of the normal feeder (see Regulation 560.6.5).

Chapter 56 p.223-227
SAFETY SERVICES

560.6 p.224
ELECTRICAL SOURCES FOR SAFETY SERVICES

560.6.1 p.224
The following electrical sources for safety services are recognized:
(i) Storage batteries
(ii) Primary cells
(iii) Generator sets independent of the normal supply
(iv) A separate feeder of the supply network that is effectively independent of the normal feeder.

560.6.5 p.224
Separated independent feeders from a distributor’s network shall not serve as electrical sources for safety services unless assurance can be obtained that the two supplies are unlikely to fail concurrently.