Electromagnetic compatibility (EMC): A mechanical capability of securing performance of the machinery by exerting on both senders and receivers of electronic waves.

Application Standards	Details and Applicabilities
Article 187 (Metal Duct Work), the Evaluation Standards of the Technical Guidelines for Electrical Facilities	Products, a minimum of 5cm in width, shall be subject to Article 187 (Metal Duct Work), the Evaluation Standards of the Technical Guidelines for Electrical Facilities. (Ministry of Commerce, Industry and Energy; Power 57300-157; Feb 24, 2003)
Technical Guidelines of Local Communication Lines for Office buildings (Korea Information Communication Contractors Association) Amendment of Ministry of Commerce, Industry and Energy Notice no. 2006-213 (Jul 4, 2006) Standard Testing Methods of the Technical Guidelines for Electrical and Communication Facilities Chapter 3 Indoor Wiring Work, Standard Specifications for Construction and Electrical Facilities Work, Ministry of Construction and Transportation	distance between local communication line (design) and power cable (480V or lower) unsheathed power cable and nonmetallic tubing routes: 13cm unsheathed power cable and nonmetallic tubing routes: 7cm grounded metallic tubing cable and routes: none * U.T. Pole offers perfect EMC screening by bolting the main body and diaphragms and providing equi-potential ground bonding between the diaphragms.
BS 4678 Part 1 ( & ) IEC 61084-1&2 KS C IEC 61084-1&2 NFPA 70 Art 376&378 EIA/TIA STANDARD 569	CABLE TRUNKING - STEEL SURFACE TRUNKING CABLE TRUNKING AND DUCTING SYSTEMS FOR ELECTRICAL INSTALLATIONS METAL WIREWAYS & NONMETALLIC WIREWAYS COMMERCIAL BUILDING STANDARD FOR TELECOMMUNICATIONS PATHWAYS AND SPACES
* EIA: ELECTRONIC INDUSTRIES ASSOCIATION * TIA: TELECOMMUNICATIONS INDUSTRY ASSOCIATION

Article 187 (Metal Duct Work), the Technical Guidelines for Electrical Facilities

Ministry of Knowledge Economy Notice no. 2009 - 60

Amended and accordingly announced hereunder are the portions of Article 67, the Electric Utility Act and Article 43, the Enforcement Decree of the Electric Utility Act, and of the Evaluation Standards of the Technical Guidelines for Electrical Facilities (Ministry of Commerce, Industry and Energy Notice no. 2007-10; Jan 17, 2007) as per Article 4, the Technical Guidelines for Electrical Facilities.

25 February 2009

Minister of Knowledge Economy

Article 187 Metal Ductwork

A. Low-voltage indoor wiring via metal ductwork shall be carried out as per the following:

1. Insulated cables shall be used (excluding plastic insulated cables for outdoor uses). .
2. Sum of the cross section of cables deposited into the metal duct (including the cross section of insulating sheaths)shall be a maximum of 20 percent of the internal cross section of the duct (50 percent for wiring comprised only of electric signs, entrance and exit signs, and other similar devices, or control circuits).
3. Metal ducts shall have no contact points for cables inside, except where the cables are to be branched out, in which cases contact points shall be provided for easy inspection.
4. For the areas where cables inside the metal duct are pulled outward, the cables shall be installed such that they are not damaged while traveling through the penetration holes.
5. No objects or materials shall be deposited inside the metal duct which may damage the sheathing of cables.

B. Metal ducts used for metal ductwork shall comply with the following:

1. The ducts shall be greater than 5㎝ in width and made of iron sheets, 1.2mm or greater in thickness, or equivalent metals, and shall be solid.
2. There shall be no protrusions on the inner surface which may damage the sheathing of cables.
3. Inner and outer surfaces shall be zinc-coated or coated with equivalent material to help protect against oxidation.

C. The metal duct mentioned in “Item 2” above shall be installed as per the following:

1. Metal ducts shall be connected to each other via solid and electrically flawless devices/methods.
2. In the case where the duct is fixed to a contrast agent, the distance between the duct’s support points shall be a maximum of 3m (6m for vertically fixed installations prohibiting travels by personnel other than the designated ones), and the duct shall be fixed securely.
3. The duct cover shall be installed such that it is not easily removed.
4. The ends/tops of the duct shall be blocked.
5. No dirt shall be permitted inside the duct.
6. The duct shall be installed such that there will be no lower sites where water may pool.
7. Class III ground work shall be provided for a metal duct with low-voltage indoor wiring in the case where the service voltage is lower than 400V.
8. Class III special ground work shall be provided for a metal duct with low-voltage indoor wiring in the case where the service voltage is a minimum of 400V. Class III ground work may be carried out instead in the case where the installation prohibits contact by humans.

D. In the case where metal ducts carry low-voltage indoor cables through the building’s fire-proof areas or are extended to nearby lighting systems, the fire-proof walls or the inside of the ducts penetrating the walls of such lighting systems shall be screened with nonflammable materials.

E. The following shall be observed when installing lighting systems that are installed indoors whose units are connected to each other by linking the ends of each constituent and are provided with penetration wiring for power supply (the “Lighting Systems Installed via Connection”):

1. Lighting systems shall not be used as raceways, except where the systems are certified as per the Electric Appliances Safety Control Act and are installed by the following:
• The Lighting Systems Installed via Connection shall comply with “12. Thermal (Temperature Elevation) Testing,” the IEC 60598-1 (2006, Ed. 6.1).
• The Lighting Systems Installed via Connection (pendant-type) shall comply with “6.3 Static Loading Test,” specified in the “Raceways” under KS C 8465 for individual lighting systems.
• The Lighting Systems Installed via Connection shall have a compliance mark as well as indicate the maximum number of lighting systems allowed for connected installation.
• Installation shall be carried out as per Items 1 and 3 above.
• The Lighting Systems Installed via Connection shall comply with “12. Electrical Properties,” under Cable Trunking and Duct System for Electrical Facilities, Part I: General Requirements of the KS C IEC 61084-1, or shall be connected via grounding lines.
2. Work shall also consider the environmental conditions of the installation sites to help ensure protection against risks of electric shock and fire thereof.

Ministry of Commerce, Industry and Energy Notices

Purpose

To protect the safety of personnel and communications equipment by helping to prevent induced noise elements, elevation in ground electric potential, and other various hazards generated by power transmission and distribution systems, electric railing facilities, etc.

Reference Value

- Induced high-risk voltage during failure: 650V (430V for current elimination time during failure equivalent to a minimum of 0.1 seconds) - Induced hazardous longitudinal voltage during regular service: 60V - Induced longitudinal voltage during mechanical failure: 15V - Noise voltage: 1㎷

Monitoring Methods

A. Induced hazardous voltage during failure; induced hazardous longitudinal voltage during regular service; induced longitudinal voltage during mechanical failure

1. Monitoring Circuits

2. Monitoring Conditions

1. Ground the ends and the monitoring ends of rail facilities, respectively.
2. Use the method of flat voltage measurement under operating state.

3. Monitoring Methods

1. Tie two of the terminals of the ends and ground them; connect the cables tying two of the terminals of the monitoring ends to the AC voltage meter.
2. Ground the AC voltage meter to monitor the voltage appearing in the said meter

4. Monitoring Instruments

1. AC voltage meter
2. Noise voltage

1) Monitoring Circuits

2) Monitoring Conditions

1. The noise voltage meter shall include evaluative noise filtering.
2. Conduct external cabinet grounding for the noise voltage meter.

3) Monitoring Procedure

1. Terminate the ends of the facilities at 600Ω.
2. Inter-cable evaluative noise voltage for each cable of the rail facilities shall be monitored at a state where connection is not made to other electrical and/or communication facilities.
3. Monitoring shall be made on the evaluative noise voltage of signaling elements based on inputs of relative levels for each frequency.

4) Monitoring Instruments

1. Noise voltage meter