Click here for FAA Advisory Circular #70/7460-1M (Nov. 2020)
PRM-36 Applications
The FAA advises that 36” power line markers be used on high transmission lines and hazardous river crossings. Each power line marker should be a solid color—international orange, yellow, or white—and the FAA suggests that alternating colors be used on critical lines to optimize visibility in all seasons. See FAA Advisory Circular 70/7460-1M (Nov. 2022).
PRM-36 Models
Available in ABS and aluminum models, the PRM-36 is identical to our industry standard 36-inch SpanGuard markers, which attach directly to the line with armor rods, not clamps. (SpanGuard markers are made to order and have a longer lead time.)
PRM-36 Assembly & Installation
The PRM-36 is simple to install on the ground or from a bucket. The universal clamps have a large surface compression grip for lines from 0.50″ to 2.25″. Clamps for smaller line sizes are available by special order.
The compression grip consists of two castings. The base casting, shown in pink in the CAD drawing at left, measures 2.25″ x 2.25″. The upper casting, shown in green, measures 4.25″ x 2.25″ and is attached after positioning the marker on the conductor.
PRM-36 Ordering Information
Lead times for PRM-36 power line markers vary with demand. Part numbers are shown below.
| Material: | ABS | Aluminum |
| Voltage up to: | 115 kV | 500 kV |
| Temperature up to: | — | 482° F (250°C) |
| Orange | PRM-36-O | PRM-AL36-O |
| Yellow | PRM-36-Y | PRM-AL36-Y |
| White | PRM-36-W | PRM-AL36-W |
PDFs
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