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| 型号： | PDB321-3 |
| 厂商： | COOPER INDUSTRIES |
| 元件分类： | 接线盒 |
| 中文描述： | 175 A, BARRIER STRIP TERMINAL BLOCK, 2 ROWS, 1 DECK |
| 文件页数： | 13/23页 |
| 文件大小： | 1700K |
| 代理商： | PDB321-3 |
Form No. PDB
Page 20 of 23
Data Sheet #1049
07-05-07
BU-SB07255
Application Notes
(2) UL508A has provisions to raise the rating of power
distribution blocks by the use of current-limiting
overcurrent protective devices such as current-limiting
fuses (i.e. class J, T, RK1, etc.) in the feeder portion of the
circuit.
(3) If the SCCR rating for a power distribution block, terminal
block or multi-lug connector is not established by (1) or (2)
above, then the SCCR is the default 10kA per UL508A,
Supplement SB, Table SB4.1.
For more in depth application material on SCCR see
Industrial Control Panel section of publication SPD or
Advanced Guide To Understanding Assembly Short-Circuit
Current Rating.
SCCR for Multi-Lug Connector (Power Distribution
Lug) Switch and Circuit Breaker
Switches or circuit breakers with multi-lug connectors for
conductor terminations serve a very similar wire management
function as power distribution blocks. However, it cannot be
assumed that when a multi-lug connector is installed on a
circuit breaker or switch, that the SCCR of the multi-lug
connector is the same as the interrupting rating of the
protective device. Multi-lug connectors are covered under UL
Standard 486 A/B. Much like a power distribution block,
multi-lug connectors are components for distributing tap
conductors to power loads and are not an integral part of the
overcurrent protective device operation. Therefore, the
multi-lug connector must be evaluated in a short-circuit test
with the specific overcurrent protective device and listed with
a specific combination SCCR. It is important to note, most
switches and circuit breakers are not short-circuit tested with
multi-lug connectors. If a multi-lug connector on a circuit
breaker or switch does not have a combination SCCR with
the specific overcurrent protective device used, then it is to
be treated in the same manner as an unmarked power
distribution block, which means the SCCR is the default 10kA
(UL508A, Supplement SB). To repeat, unless the switch or
circuit breaker with a multi-lug connector is specifically
marked with a short-circuit current rating, the actual short-
circuit current rating is 10,000 amperes (or less, if the
interrupting rating of the circuit breaker or fuse is less than
10,000 amperes). The use of a listed and tested combination
SCCR will ensure that a higher rating is achieved for the
product and aid in achieving a higher overall SCCR for the
industrial control panel.
PDB Spacing Requirements for Equipment:
Depending upon the specific application and the standard to
which the equipment is being designed, there are certain
PDBs that can meet these spacing requirements, some with a
high SCCR. The following details the spacing requirements at
600V based upon the equipment standards.
Industrial Control Panels (UL508A):
UL508A contains three important requirements to consider
when applying power distribution blocks.
Spacing of 1 through air, 2 over surface (301 to 600V) is
required when used in a feeder circuit (that’s everything
ahead of or on the line side of the final branch circuit
overcurrent protective device).
An assumed short-circuit current rating of 10kA for power
distribution and terminal blocks not marked with a higher
short-circuit current rating, per UL508A Table SB4.1.
Conductor ampacity requirements based on conductor
terminal temperature ratings and UL508A conductor
ampacities
The following details the requirements regarding the use of
power distribution blocks in industrial control panels.
Use of Power Distribution Blocks in Industrial Control
Panel Feeder Circuits (600V & below)
A Listed PDB (UL1953) can be used “as is” since it meets
the 2 and 1 spacing requirements for feeder circuits in
UL508A section 10.2 (see Table 10.2) & 28.2.4.
A Recognized Terminal Block (UL1059) can only be used if
it meets the spacing requirements in UL508A sections 10.2
(see Table 10.2) & 28.2.1 and it is suitable for field wiring
(use Group A, C or D of UL 1059).
– Use Group A: Service — including dead-front switch
boards, panelboards, service equipment, and the like.
– Use Group B: Commercial appliances, including
business equipment, electronic data processing
equipment, and the like.
– Use Group C: Industrial, general.
– Use Group D: Industrial, devices having limited ratings.
Such as where the load on any single circuit of the
terminal block does not exceed 15 amperes at 51 to
150 volts, 10 amperes at 151 to 300 volts, 5 amperes at
301 to 600 volts, or the maximum ampere rating,
whichever is less.
Listed PDBs have adequate spacing for feeder
circuit applications but most recognized terminal
blocks don’t have the spacing required
for use in feeder circuits
Spacing between
live parts of
live parts and
UL Standard
opposite polarity
grounded parts
or enclosure
@600V
508A Feeder
Circuits
508A Branch
Circuits
1995 HVAC
Through air
Over surface
@600V
1
2
1
38
12
38
12
Note: Refer to Specific UL standards for complete spacing details.
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