ACME ELECTRIC
•
MILWAUKEE, WI
•
800.334.5214
•
acmetransformer.com
139
GENERAL
ELECTRICAL CONNECTION DIAGRAMS
ACME
®
TR NSF RMER
™
I DUST Y STANDARDS
Primary
Secondary
Type of
Number of
Case
Supply
Phase
Wires on
Protection
OCP
Current
OCP
Current
OCP
Voltage
Secondary
Required
Location
(AMPS)
(% of rating)
(AMPS)
(% of rating)
> 9
125
①
1
Main
1Ø
2
Primary
A
< 9, > 2
167 max.
Not Required
Only
< 2
300 max.
Primary
≥
9
125
①
2
Main
1Ø
More than 2
&
A & B
< 9,
≥
2
167 max.
≥
9
125
①
3Ø
Not Applicable Secondary
②
<2
300 max.
<9
167 max.
Feeder
None
3
Circuit
1Ø
2
on
—
Not Required
Not Required
with OCP
Either
Feeder
4
Circuit
1Ø
More than 2
Secondary
B
Not Required
9
125
①
with OCP
3Ø
Not Applicable
Only
②
<9
167 max.
Listed
Certified
How to overcurrent protect (OCP) 600 volt class transformers and associated wiring
. . . in accordance with the ‘99 National Electric Code (Articles 450-3(b) and 240-3 (i))
B
LOAD
A
SUPPLY
VOLTAGE
OCP LOCATION
①
% of rated current (or next higher standard rating).
②
In cases where the secondary is overcurrent protected, the primary overcurrent
protection rating can be no more than 250% (2.5 times) full load amps (shown on
above chart). For example, if a 10 kVA, single phase transformer has a 480V primary
and a 120/240 secondary, and the secondary is overcurrent protected, maximum
primary overcurrent protection rating is 20.8 amps (full load current) x 2.5 (250%) =
52. Therefore, use a standard 50 amp fuse or breaker selected from NEC Section
240-6 (below).
Acme
®
Transformer
™
Products vs. U/L Insulation Systems & U/L Standards
Transformer Industry Standards
Underwriters’ Laboratories, Inc. is an independent not for profit
organization which tests products for safety.
Acme’s transformers are designed and manufactured to comply
with UL Standard 506, 1561, 1012, or 1062 and carry the
applicable UL Listing Label. Because of the continuous product
evolutions at Acme, it is best that you contact the factory for
the current file and guide numbers associated with the listings.
The Canadian Standards Association is the Canadian
counterpart to Underwriters’ Laboratories. Acme’s
transformers are also constructed and rated to comply with
CSA Standards C22.2-47 and C22.2-66 and carry the CSA
Certification Label.
All of Acme’s transformers are manufactured to meet National
Electrical Code requirements.
Other Agencies and Standards:
National Electrical Manufacturers Association (NEMA)
ST-20 1992 (R1978)
American National Standards Institute (ANSI)
OSHA
IEEE
Section 240-6 of the 1999 National Electrical Code.
The standard ampere ratings
for fuses and inverse time circuit breakers shall be considered 15, 20, 25, 30, 35, 40,
45, 50, 60, 70, 80, 90, 100, 110, 125, 150, 175, 200, 225, 250, 300, 350, 400, 450, 500,
600, 700, 800, 1000, 1200, 1600, 2000, 2500, 3000, 4000, 5000 and 6000 amperes.
Exception:
Additional standard ratings for fuses shall be considered 1, 3, 6, 10, and
601.
“Extracted by permission from ANSI/NFPA 70-1999, National Electrical
Code
®
, Copyright
©
,1999, National Fire Protection Association, Boston, MA.”
Acme Electric–Power Distribution Products Division has never used
polychlorinated biphenyls (PCBs) in the manufacture of our quality products.
U/L
U/L
U/L
U/L
Insulation
kVA
kVA
Acme Construction Acme Catalog
U/L
Product
File
Listed
Insulation
System Single Three
Style
Product Name
Standard Category Number
Control # Number
Temp./C
Phase Phase
Enclosed
General Purpose
506
XPTQ E79947V1
50B8
B3223
130
.050-.150
N/A
and Buck-Boost
Compound Filled
General Purpose
506
XPTQ E79947V1
50B8
X3221
155
.25-5.0 3.0-6.0
(Encapsulated)
Buck-Boost & DIT
H3221
180
7.5-25.0 7.5-75.0
Panel Tran
®
1062
YEFR E56936V1
N/A
H3180
180
5.0
N/A
H3221
180
7.5-25.0 9.0-30.0
Swim Pool & Spa
379
HDGV E111069V1
N/A
H3180
180
0.10-.30
N/A
Hardwired CVR
1012
QQFU E86492V1
6B81
B3223
130
.25-3.0
N/A
X3221
155
5.0-15.0
N/A
Portable PLC
1012
QQFU E86492V1
60B1
B3223
130
.25-2.0
N/A
Open Core & Coil
Industrial Control
506
XPTQ E79947V1
50B8
B3223
130
.050-5.0
N/A
Air Cooled
General Purpose
1561
XQNX E12547V3
542B
C3222
220
37.5-250.0 25-1000
Ventilated &
Opti-Miser
®
& DIT
Non Ventilated
Air Conditioning
NONE
NONE
NONE
N/A
NONE
130
.085-2.0
N/A
Enclosed
and Refrigeration
Appliance
