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| 型號： | PDB220-3 |
| 廠商： | COOPER INDUSTRIES |
| 元件分類： | 接線盒 |
| 中文描述： | 175 A, BARRIER STRIP TERMINAL BLOCK, 2 ROWS, 1 DECK |
| 文件頁數(shù)： | 14/23頁 |
| 文件大?。?/td> | 1700K |
| 代理商： | PDB220-3 |
Form No. PDB
Page 21 of 23
Data Sheet #1049
07-05-07
BU-SB07255
Application Notes
Use of Power Distribution Blocks in Industrial Control
Panel Branch Circuits (600V & below)
A Listed PDB (UL1953) can be used “as is” since it exceeds
the spacing requirements for branch circuits in UL508A
section 10.2 (see table 10.1) & 28.2.4.
A Recognized Terminal Block (UL1059) can only be used if
it meets the spacing requirements at the required voltage in
UL 508A, section 10.2 (see Table 10.1) & 28.2.1 and it is
suitable for field wiring (Use Group A, C or D of UL 1059).
Power Distribution Block Application Examples –
UL 508A
Termination Ratings
Important considerations in the electrical and thermal
relationship for components in a circuit are the conductor
size, material, rated ampacity, conductor insulation
temperature rating and the permissible connector device
conductor temperature limits.
If a conductor terminates at two devices that have conductor
terminations rated at two different temperatures, the
conductor ampacity must correlate to the terminal with the
lowest temperature rating.
Conductors with higher temperature ratings can be used at
their rated ampacities if the terminations of the circuit devices
are rated for the higher temperature rated conductor [NEC
110.14(C)(1)(a)(3)]. However, the industry norm is that most
devices rated 100A or less, such as blocks, disconnects,
controllers and circuit breakers, have 60°C or 75°C rated
terminations. For circuits greater than 100A, the norm is
75°C terminations. UL508A has further internal wiring
restrictions requiring 90°C insulated conductors, but these
conductors are sized based on either 60C or 75C
allowable ampacities.
Terminations have a temperature rating that must be
observed and this has implications on permissible conductor
temperature rating and ampacity. Shown below are three
common termination ratings and the rules. The conductor
ampacity may also have to be derated due to ambient,
conduit fill or other reasons.
Terminal
Temp Rating
60°C, 75°C, 90°C or higher temperature rated
60°C
conductor can be used, but the ampacity of the
conductor must be based as if conductor is
rated 60°C.
75°C, 90°C or higher temperature rated conductor
75°C
can be used, but the ampacity of the conductor must
be based as if conductor is rated 75°C. A 60°C
conductor is not permitted to be used.
Dual temperature rated termination. Either 60°C
conductors at 60°C ampacity or 75°C conductors at
60°C/75°C
75°C ampacity can be used. If 90°C or higher
temperature rated conductor is used, the ampacity of
the conductor must be based as if conductor is
rated 75°C.
PDB in UL 508A, 480V Feeder Circuit must have spacing of 1 through air and 2
over suface. PDBs listed to UL 1953 meet these spacing requirements. Terminal
Blocks recognized to UL 1059 must be verified to have required spacing.
PDB in UL508A, 480V Branch Circuit must have spacing of 38 through air and 12
over surface. PDBs listed to UL 1953 meet these spacing as well as most
terminal blocks recognized to UL 1059.
75°C terminal
60°C terminal
Conductor size and insulation rating?
Listed PDBs have adequate spacing for branch
circuit applications and most recognized terminal
blocks are also adequate for branch
circuit applications
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