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381333–228 G
50 Hanover Road, Florham Park, New Jersey 07932–1591 USA
For sales or service call 1 800 800–2726 (ASCO) www.ascopower.com
ASCO POWER TECHNOLOGIES CANADA PO Box 1238, 17 Airport Road, Brantford, Ontario, Canada N3T 5T3
Operator’s
Manual
Seri es 300
Automatic Transfer Switches
D–design, 30 through 230 A
DANGER is u sed in this m anual to warn of high
voltages capable of causing shock, burns, or death .
WARNINGisusedinthismanualtowarn
of possible personal injury.
CAUTIONisusedinthismanualtowarn
of possible equipment damage.
An ex p erienced l icen sed e lectric ian mu st in stall t he ATS .
30–200 am p. s izes
Refer to the outline and wiring drawings provided with
your ASCO Series 300 ATS for all installation details.
A SCO Series 300 A utomatic Transfer S w itches ( ATSs) are
Listed under Underwriters Laboratories UL 1008 Standard
for Safety for A u tom atic Tran sfer Switches. ASCO Series
300s are also Listed under CSA C22.2 No. 178 Standard f or
Automatic Tr an sfer Switches. All control features are UL
Componen t Rec og nized, which assur es that ASCO auto-
matic transfer switches meet OS H A Safety Requ irem ents
and wil l be accep tab l e to electr ic al inspec tors .
A SCO Series 300 A utomatic Transfer S w itches a re suitable
for e m ergency and s tandby system applications. They meet
emer g enc y system rating requiremen ts as defined in Na-
tional Electrical Code (N EC) Article 700 and UL 1008.
Also, they a re suitable for the requirements of N EC Article
517 – Health Care Facilities, NE C Artic l e 701 – L egal ly
Required Standby Systems, NE C Article 702 – Optional
Standb y System s , NFPA 99 Heal th Care Facil ities, and
NFPA 110 Emergency and Standby P ow er Systems.
Rating Label
Eac h autom atic transfer switc h contains a rating lab el to
define the loads and fault circuit withstand / closing ratings.
Refer to the label on the transfer switch for specific values .
Do not exceed the values on the rating label.
Exceeding the rating can cause personal
injury or serious equipment damage.
TABLE OF CONTENTS
section
INSTALLATION 1..........................
SEQUENCE OF OPERATION 2.............
TESTING & SERVICE 3....................
ADJUSTMENTS 4.........................
CONTROL FEATURES 5...................
INDEX back cover.........................