Acme Catalog

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E n c l o s u r e D e f i n i t i o n s
(NEUTRAL)
10 KVA
8 KVA 4 KVA 5 KVA
A
B
C
CORRECT WAY:
(NEUTRAL)
10 KVA
5 KVA 4 KVA
A
B
C
INCORRECT WAY:
8 KVA
CORRECT WAY:
1 KVA
120V
120V
240V 8 KVA
1 KVA
A
B
INCORRECT WAY:
1 KVA 1 KVA
120V
120V
240V 8 KVA
If the incorrect method is used, winding A will be loaded at 6 kVA, and winding B will be loaded at 4 kVA. These do total 10
kVA but, since each winding is only rated at 5 kVA (1/2 of nameplate rating), we have an overloaded transformer and a
certain failure.
39. What are typical applications for transfomers?
ACME transformers should be specified to:
(1) Distribute power at high voltage.
(2) Eliminate double wiring.
(3) Operate 120 volt equipment from power circuits.
(4) Insulate circuits/establish separately derived circuits.
(5) Provide 3-wire secondary circuits.
(6) Buck and Boost (See Section 8).
(7) Provide electrostatic shielding for transient noise protection.
Enclosure Definitions
Type 1 Enclosures
Intended for indoor use, primarily to provide a degree of protection against contact with the
enclosed equipment.
Type 2 Enclosures
Intended for indoor use, primarily to provide a degree of protection against limited amounts of
falling water and dirt.
Type 3R Enclosures
Intended for outdoor use, primarily to provide a degree of protection against falling rain, sleet and
external ice formation.
Definitions Pertaining to Enclosures
Ventilated
Constructed to provide for circulation of external air through the enclosure to remove excess heat,
fumes or vapors.
Non-Ventilated Constructed to provide no intentional circulation of external air through the enclosure.
Indoor Locations Those areas protected from exposure to the weather.
Outdoor Locations Those areas exposed to the weather.
Hazardous
(Classified) Locations
Those areas, which may contain hazardous (classified) materials in sufficient quantity to create an
explosion. See Article 500 of The National Electrical Code.