Is it necessary to to stop the jockey pump if the electrical pump is in operation during a fire condition?

Not necessarily.

• The jockey pump stop point should equal the pump churn pressure plus the minimum static supply pressure.
• The jockey pump start point should be at least 10 psi (0.68 bar) less than the jockey pump stop point.
• The fire pump start point should be 5 psi (0.34 bar) less than the jockey pump start point.

It is theoretically possible for both to remain in operation since there is a overlap between the start and stop pressures of each.

Cheers.

certainly it is necessary to stop.....