clip conduit 20mm / 3/4in.

Cable Management Fixing Accessories, Metal, Saddles, 20Mm Hot Dip Galvanised

Catalogue Number: 180HD20
clip conduit 20mm / 3/4in.
Colour:
Colour: Per UOM Std.
  • 1 PCE

Specifications

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Product brand
Clipsal
Diameter
20 mm
Material
steel
Surface treatment
hot-dip galvanized
Length
50 mm
Width
19 mm
Height
22 mm
REACh Regulation
Free of Substances of Very High Concern above the threshold
REACh free of SVHC
Yes
EU RoHS Directive
Pro-active compliance (Product out of EU RoHS legal scope)
Toxic heavy metal free
Yes
Mercury free
Yes
RoHS exemption information
Yes
China RoHS Regulation
 Pro-active China RoHS declaration (out of China RoHS legal scope)
Circularity Profile
N/A

Documents & downloads

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  • Installation Instruction

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  • Certificates (MSDS)

Frequently Asked Questions

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What is the VA rating of a 9001KM transformer light module?

Issue:
What is the VA rating of a 9001KM transformer light module?

Product Line:
Harmony Pushbuttons

Environment:
All Products

Cause:
Product Features

Resolution:
9001 KM2 110-120 volt 25-30 hertz      2.2 VA
9001 KM1 110-120 volt 50-60 hertz      2.4 VA
9001 KM3 208-220 volt 50-60 hertz      2.5 VA
9001 KM4 220-240 volt 25-30 hertz      2.2 VA
9001 KM7 220-240 volt 50-60 hertz      2.0 VA
9001 KM8 277 volt 50-60 hertz             2.4 VA
9001 KM5 380-480 volt 50-60 hertz      2.8 VA
9001 KM6 550-600 volt 50-60 hertz      2.5 VA

What does the Y mean at the end of the ATS48 part number?

Issue:
What does the Y mean at the end of the ATS48 part number?

Product Line:
All ATS48 Soft Starts

Environment:
Altistart 48

Cause:
N/A

Resolution:
ATS48 has a control supply and a power supply.

On  the Y range, you have a control supply that is 110-220 and the power supply is 208-690V. Y range is dedicated for the US market, with NEC standard soft starter that must be protected against the current unbalance.  Y range has three current sensors,. There are only 2 on the Q range (one more OLF on the Y range).

On Q range, the control supply is 220-415V and the power supply is 230-415V.
 

NetBotz UI slow when viewing Pelco image

Issue:

Viewing a Pelco camera image in the NetBotz Advanced View or the web UI causes a performance issue on the NetBotz appliance.

Product Line:
NetBotz

Environment:
NetBotz 4.x
NetBotz Advanced View
NetBotz web UI
Supported Pelco Cameras

Cause:
Viewing a Pelco camera image in the NetBotz Advanced View or the web UI using any resolution other than the resolution that matches the setting on the Pelco camera causes a performance issue on the NetBotz appliance.

The NetBotz appliance must use more processing power to re-size the image when you view the image with mismatched settings.

Example:
The Pelco camera resolution is set to 1280x720.
When you view the image at 1280x720 in the Advanced View or the web UI, there are no noticeable performance issues.
When you view the image at 320x240 in the Advanced View or the web UI, the interface responsiveness becomes very slow.

Resolution
Make sure the resolution set in the Advanced View or web UI matches the resolution set on the Pelco camera.

What are Metering Units?

 

Metering Units represent the secondary values for the current and voltage transformers. That is Metering Units are the values present at the voltage and current inputs at the back of the meter.
As an example, if the PTs (voltage transformers) have a ratio of 480:120 and the CTs (current transformer) have a ratio of 300:5; and you were injecting full secondary values (120 Vl-l and 5 A) for all three phases you would see the the following values:

kw A = 120 V * 5 A = 600 W = 0.600 kW
kw B = 120 V * 5 A = 600 W = 0.600 kW
kw C = 120 V * 5 A = 600 W = 0.600 kW
kw total = 0.600 kw + 0.600 kw + 0.600 kw = 1.80 kw

*note: these calculation assume a unity power factor
*note: Metering Units can sometimes be referred to as "uncompensated" or "unscaled" values.





Last Revised: October 3, 2012
Public
All content © 1992-2012 Schneider Electric

Legacy KB System (APS) Data: RESL188299 V3.0, Originally authored by KBAdPM on 10/04/2007, Last Edited by MaTh on 10/10/2012
Related ranges: ION8800, ION8600, ION7550/ION7650, ION7300

EM4900 Installation: Using Voltage/Potential Transformers

Issue
User may need to use PTs when installing the EM4900 series meters and may not know that they do NOT have the option to program PT ratios in their configurations.
 

Product Line
EM4900

Environment
Installation
 

Cause
BCPM and EM4900 series meters do not have the option to program PT ratios in their configurations.

Resolution
The user may use PTs to step down the input control power and measurement voltages as required, but will need to compensate for the ratios when reading the meter's outputs, in the case of the measurement voltages.
For example, if a PT of ratio 480:120 is used, one will need to multiply all the output values, with the exception of the current, by a factor of 4.

Kindly refer to the link below for the EM4900 series documentation:

FA324770

What values should be set for the potential transformer (PT) primary and secondary values in a CM4000 when connecting the voltage inputs of meters directly to the bus (with fuses)?

Issue
A user may want to know the PT primary and secondary values for a CM4000 upon initial setup

Product Line
CM4000

Environment
Setup

Cause
The meter may be set to "No PT" or the PT ratio may be used. 

Resolution
When setting the PT ratio, one may select "No PT" for the PT Primary Scale - there is no requirement to set the PT ratio if "NO PT" is chosen.

The PT Primary and PT Secondary inputs are still available, but they are not used when "No PT" is selected for the PT Pri Scale.
A user would set the PT ratio to "No PT" when the system voltage used by the load to be metered is the same as the system voltage connected directly to the meter (i.e. direct connect with no potential transformers used).

The PT ratio needs to be set only when the load is using a different voltage from the meter voltage inputs (i.e. potential transformers are being utilized). Potential transformers are used when the voltage of the electrical system is higher than the rated specifications of the meter voltage inputs. The PT primary and secondary ratio on the meter should match that of the potential transformers in the field.

Example 1: When metering a 1.2 kV system with a set of PT's that contain a ratio of 1200:120, the PT Primary of the meter should be set to 1200 and the PT Secondary of the meter should be set to 120.
(Potential transformers are used in this scenario because 1.2 kV exceeds the acceptable voltage input threshold the CM4000 can withstand (1–690 L-L, 400 L-N)

Example 2: When metering a a 480V L-L system, no PT's are being used. The system voltage is directly connected to the metering inputs. In this scenario, you would set the PT Pri Scale of the meter to "No PT".

Note: If the meter receives voltage that is the same as the voltage used by the load and "No PT" is NOT selected, then a PT ratio of 1:1 would need to be used and is still acceptable. (i.e.This result can be achieved by setting the PT Ratio to 120:120 or 480:480)

Wiring of RS485 Communications Networks

Issue
This document attempts to explain correct methods of wiring RS485 communication networks in industrial environments based on various application notes and technical articles.

Environment
 
RS485 Serial Modbus Communications

Resolution
 
1. RS-485 (EIA/TIA-485) Differential Data Transmission System Basics
 
The RS-485 standard was developed jointly by two trade associations: the Electronic Industries Association (EIA) and the Telecommunications Industry Association (TIA). The original prefix "RS" stands for Recommended Standard and has been officially replaced with "EIA/TIA" to help identify the origin of its standards.
 

 

  RS-485 Standard Specifications
Mode of operation
Differential
Allowed no. of Tx and Rx
32 Tx 32 Rx
Maximum cable length
4000ft length
Maximum data rate
10Mbps
Minimum driver output range
±1.5V
Maximum driver output range
±5V
Minimum drive capability
±55mA
Maximum driver short-circuit current
250mA
Tx load impedance
54
Rx input sensitivity
±200mV
Maximum Rx input resistance
12k
Rx input voltage range
-7V to +12V
Rx logic high
>200mV
Rx logic low
<200mV
Max common mode voltage
-7V to +12V

 
Full duplex implementation requires 4 wires. This may be necessary for some applications involving legacy devices. In half-duplex implementation 2 wires are used this is the recommended configuration for most Schneider Electric PMC devices.
    •  
All products manufactured by Schneider Electric PMC support half-duplex, 2 wire configuration. The 4 wire interface is usually implemented in order to avoid creating a T (tee) or star connections or to support full duplex connections.
 
A twisted pair type of cable should be used in order to reduce radiated emissions and improve immunity of the communications system to any external electromagnetic interference.
 
The National Electrical Code and all applicable local regulations must be followed when installing the communications wiring.
 
Cable examples:
    • -Belden 9841 or Alpha 6412 or equivalent cable may be used for applications under 300V that are indoors or outdoors in conduit above grade.
           
    • -Belden 3074F or equivalent cable may be used for applications greater than 300V which are indoors or outdoors in conduit above grade.
 
In all devices the RS485 ports are opto-isolated from the internal device electronics. All devices with RS485 port have a shield terminal, which may be connected to the chassis ground (e.g. on 7X50, 880, 8600) or to the isolated reference of the RS485 port (i.e. no connection to the chassis ground as in 6200, 6300, 6100)
    •  
    •  
2. Network Configuration
 
2.1 Topology
Several types of network topologies are possible, but the daisy-chain bus configuration is the most efficient. Typically, one of the units is the master controlling the network traffic and prevents multiple drivers from being active at the same time (bus contention). A shielded twisted pair cable is the physical medium. The cable impedance should be within 100-120? range. In the Backbone with Studs technology, no studs should be left unconnected at the device end. Otherwise, such a stud will act as an antenna and introduce a significant amount of noise on the RS485 bus, to such a point that comms may become impossible. This is actually a fairly common source of problems.
 

 
 
The longer the cable, the lower the data rate:
 
 
 
 
2.2 Termination
Termination resistors that match the cable's characteristic impedance are essential for minimizing reflections and consequently communication error rates and electromagnetic emissions. For common RS-485 cables (a twisted pair of 24AWG wires), this means a 100-120 resistor at both ends . Termination resistors should be used especially with long cable length to ensure data integrity. Note that, on very long cable length, adding termination resistors can sometime cause an additional drop of voltage that will cause a loss of communication on the devices that are furthest from the master. In this case, adding a repeater or removing some termination resistors can restore comms.
2.3 Fails-Safe Biasing
 
Open bus condition:
 
    • When a node is disconnected from the bus, the state of the bus, as seen by the  receiver, is undetermined and may result in random output from the receiver.  A weak failsafe biasing is recommended to ensure that the receiver does not enter undetermined state under open bus conditions.
       
Idle bus condition:
 
    • When no drivers are active on a bus with termination resistors, those resistors will decrease the differential bus voltage to zero, which according to the RS485 standard, is an undefined bus condition. Biasing resistors should be used in order to generate a valid bus logic state under idle-bus conditions. Biasing resistors are only needed at one node (usually the master), hence configuration switches must be used if the biasing resistors are incorporated into every node. Only one device on the bus should be providing the biasing. The biasing resistors may be external or internal to the device. Some products e.g.8800, 7X50 have internal resistors which may be connected with internal switches to provide biasing of the bus.  The Com 32 and Com 128 have permanently connected biasing resistors.
       
2.4 Unit Load (U.L.)
 
    • A one RS485 transceiver represent a load of 1U.L. The RS485 standard specifies the bus loading as 32 U.L.

 
2.5 Shielding and Grounding
 
The RS485 interface standard does not specify a ground wire, but such wire is needed to provide a return path for common mode currents and consequently reduce emissions. It may be possible to operate the RS485 loop without a ground wire, but such systems may radiate high levels of EMI.
           
A shield limits coupling of external interference and noise onto the bus. Generally the shield should be connected to the chassis ground (installation ground) at one end of the cable. In case of ground potential differences between nodes (common in industrial locations) this arrangement prevents the flow of DC ground loop currents in the shield. Ground loop currents flowing in the shield will induce noise in the communications cable. A capacitor or an RC network may be used between the other end and ground.
 

 
The RS485 nodes can tolerate from -7V to +12V  of common mode voltage. When this voltage is exceeded the nodes are no longer guaranteed to function and may even be damaged.
Due to significant differences in ground potentials that may and will be present between nodes in industrial locations, ground should not be used as a reference. In installations where ground is used as return path 100-120 resistors may be used to limit the ground currents flowing due to ground potential differences between devices. 
The figure below illustrates the grounding concepts.
 
 


Connection Example: 6300 meter, terminated daisy chain bus.
 
The shield terminal is not connected to chassis ground of the meter. Installer must ensure low impedance connection to the system ground at one end of the cable. The 4 wire port on the 6300 is intended to help the installer avoid making T (or stub) connections.  Note the use of termination resistors RT.
 

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    •  
       
       
       
 
 
 
 
 
 
 
 
 
 
 
 

 


 


Example: third party devices:                       
 
 


Examples of improper networks Do NOT do this:
 
Unterminated cable:

Incorrect location of termination resistor:

 
Multiple cables in a star configuration

 
Backbone cable with long stubs:


Please find a PDF copy of this document here:

16798.pdf