gh0st
Member
- Location
- California
- Occupation
- Designer
Design:
(1) Number of Disconnecting Means.
(a) General. A single disconnecting means and associated overcurrent protective device(s) shall be permitted to be installed
between the fire pump power source(s) and one of the following:
[20:9.1.2]
(1) A listed fire pump controller
(2) A listed fire pump power transfer switch
(3) A listed combination fire pump controller and power transfer switch
(b) Feeder Sources. For systems installed under the provisions of 695.3(C) only, additional disconnecting means and the associated overcurrent protective device(s) shall be permitted.
(c) On-Site Standby Generator. Where an on-site standby generator is used to supply a fire pump, an additional disconnecting means and an associated overcurrent protective device(s) shall be permitted.
(commentary) An on-site standby generator equipped with an integral disconnecting means and overcurrent protection is allowed in addition to a disconnecting means and overcurrent protection installed elsewhere in the alternate supply circuit to the fire pump. the second disconnecting means and overcurrent device could be located in distribution equipment and is required to comply with the requirements of 695.4(B)(2)(b) and 695.4(B)(3)(b) through (3)(e).
- Normal Source: Tapped ahead of MB > service disconnect (sized to LRC) > FP controller
- Generator Source: Generator with no OCP > emergency board with MB > feeder CB (sized to 125% FLA) > FP controller.
(1) Number of Disconnecting Means.
(a) General. A single disconnecting means and associated overcurrent protective device(s) shall be permitted to be installed
between the fire pump power source(s) and one of the following:
[20:9.1.2]
(1) A listed fire pump controller
(2) A listed fire pump power transfer switch
(3) A listed combination fire pump controller and power transfer switch
(b) Feeder Sources. For systems installed under the provisions of 695.3(C) only, additional disconnecting means and the associated overcurrent protective device(s) shall be permitted.
(c) On-Site Standby Generator. Where an on-site standby generator is used to supply a fire pump, an additional disconnecting means and an associated overcurrent protective device(s) shall be permitted.
(commentary) An on-site standby generator equipped with an integral disconnecting means and overcurrent protection is allowed in addition to a disconnecting means and overcurrent protection installed elsewhere in the alternate supply circuit to the fire pump. the second disconnecting means and overcurrent device could be located in distribution equipment and is required to comply with the requirements of 695.4(B)(2)(b) and 695.4(B)(3)(b) through (3)(e).