ATS shall be furnished with the following:
a.
Engine start contact.
b.
[Alternate] [Emergency] source monitor.
c.
Test switch to simulate normal power outage.
d.
Voltage sensing. Pickup voltage adjustable from 85 to 100 percent
of nominal; dropout adjustable from 75 to 98 percent of pickup.
e.
Time delay bypass switch to override return time delay to normal.
f.
Manual return-to-normal switch.
g.
Means shall be provided in the ATS to insure that
motor/transformer load inrush currents do not exceed normal
starting currents. This shall be accomplished with either
in-phase monitoring, time-delay transition, or load voltage decay
sensing methods. If manufacturer supplies an in-phase monitoring
system, the manufacturer shall indicate under what conditions a
transfer cannot be accomplished. If the manufacturer supplies a
time-delay transition system, the manufacturer shall supply
recommendations for establishing time delay. If load voltage
decay sensing is supplied, the load voltage setting shall be user
programmable.
2.1.8
Operator
Manual operator conforming to UL 1008 shall be provided, and shall
incorporate features to prevent operation by unauthorized personnel. ATS
shall be designed for safe manual operation under full load conditions. If
manual operation is accomplished by opening the door, then a dead-front
shall be supplied for operator safety.
2.1.9
Override Switch
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NOTE: Override switch allows operator to switch
load from primary source to alternate or emergency
source and keep it connected to that source. It is
useful for users who prefer alternate or emergency
source under certain operating conditions, such as
lightning storms or during maintenance on primary
source. Override switch will be specified only when
nature of mission and operators' expertise make it
desirable to control power source. User must ensure
that adequate administrative and operational
controls exist to prevent load from being
inadvertently left in alternate or emergency mode.
This paragraph should be omitted for ordinary
applications since override switch significantly
alters ATS function.
**************************************************************************
Override switch shall bypass automatic transfer controls so ATS will
transfer and remain connected to [alternate] [emergency] power source,
regardless of condition of [normal] [preferred] source. [If [alternate]
[emergency] source fails and [normal] [preferred] source is available, ATS
SECTION 16410A
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