and 30 Mhz. The careful use of frequency can reduce
the coupling of RFR voltages induced in crane
structures and rigging. A better approach, however, is
the use of RFR high voltage insulator links, which
provide protection for personnel against RFR burns.
(Refer to Link RFR High Voltage Insulator for Ship
Cranes, MIL-L-24410 (SHIPS)). Two separate bands
of fiberglass filament wound on two zinc-coated steel
saddles provide the required high electrical resistance,
low capacitance, high tensile strength, ruggedness and
fail-safe features of the insulator links. While the inner
band normally carries the full working load, the outer
band can carry the full working load if the inner band
When proper precautions are taken, personnel
handling rigging will not be harmed as long as nearby
electronic transmitting equipment is operated at an
output of 250 watts or less, average (at any frequency).
H OW E V E R ,
P E R S O N N E L
S H O U L D
CONSTANTLY ALERT TO THE FACT THAT
EVEN UNDER THE ABOVE OPERATIONAL
L I M I T S , E L E C T RO N I C T R A N S M I T T I N G
E Q U I P M E N T C A N C AU S E H A Z A R D O U S
VOLTAGES TO BE INDUCED IN THE STAND-
ING RIGGING AND OTHER PORTIONS OF A
S H I P S
S T RU C T U R E ,
PA RT I C U L A R LY
STRUCTURES AND OBJECTS (i.e., AIRPLANES
AND HELICOPTERS) THAT PROTRUDE FROM
THE SHIP IN THE SAME PLANE AS THE
RADIATING SOURCE. The RFR voltage induced in
a ships structures, rigging, or other objects will cause
burns to personnel when they contact conductive
objects. The burn hazard problem, its causes, and
remedial techniques are discussed in chapter 3 (RFR
Burns) of Electromagnetic Radiation Hazards (U)
(Hazards to Personnel, Fuel and Other Flammable
M a t e r i a l ) ( U ) ,
N A V S E A O P 3 5 6 5 / N A V A I R
16-1-529/ NAVELEX 0967-LP-624- 6010/Volume I.
What do the letters RFR stand for when
associated with radiation safety?
What are the three categories of electromagnetic
What are the three classifications of ordnance
susceptible to RFR?
What NAVSEA publication specifies safe
distances from radiation sources for fueling?
I f y o u c o n fi r m t h a t s o m e o n e h a s b e e n
overexposed to RFR, what instruction must you
use to properly report the incident?
According to the Naval Ships Engineering
Center, what is the minimum RFR voltage in an
open circuit that qualifies as hazardous?
Figure 3-3.Electrical equivalent of cargo handling equipment.