Marker balls are required to be provided in aviation zones in any span where the low point of the shield wire (OPGW/ OHGW) catenary is above 90 m AGL (Above Ground Level), which is equivalent to the low point of bottom conductor catenary at approximately 63 m AGL. Marker balls shall be placed on the top OHGW and OPGW, for aircraft warning.

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 1) Marker balls are required to be provided in aviation zones in any span where the low point of the shield wire (OPGW/ OHGW) catenary is above 90 m AGL (Above Ground Level), which is equivalent to the low point of bottom conductor catenary at approximately 63 m AGL. Marker balls shall be placed on the top OHGW and OPGW, for aircraft warning.

2) Marker Balls shall be evenly spaced along the OHGW/ OPGW, at a maximum of 60m intervals.
3) Unlighted Marker Balls shall alternate on OHGW and OPGW with aviation colors: Orange, White, and Red, with aviation Orange markers always positioned at each end.
4) If less than four (4) marker balls (lighted or unlighted) are on the OHGW/ OPGW, all marker balls shall be aviation Orange.
5) Crossings with multiple transmission lines require additional marker balls when the outside lines on the adjacent structure are more than 60 m from the center of the primary structure.
6) The Marker balls shall be EHV (Extra High Voltage) qualified, with a special coating to reduce corona effects that can degrade or discolor a standard marker ball, or even lead to burning or melting.
7) The Marker Balls shall use spiral formed armor rods to securely attach to the OHGW/ OPGW.
− These spiral formed armor rods shall extend outward from the marker and actually reinforce and protect the OHGW/ OPHW at the point of attachment.
− These spiral formed armor rods shall be completely slip-proof, and also prevent damage to the OHGW / OPGW, often associated with clamps that dig into the OHGW /OPGW.
− The spiral formed armor rods shall be matched at the time of order to the specific size, type, and diameter of the OHGW/OPGW.

For more details:
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Email:sophia@chendongtech.com
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