UFC 3-535-01
17 November 2005
13-16.4.4
All internal connections to be permanent (i.e., high-pressure crimping or
high-pressure soldering).
13-16.5
Runway and Taxiway Guidance Signs
The following are recommended for L-858 signs to limit impact on upstream equipment,
and provide performance and safety benefits.
13-16.5.1
Maximum volt-ampere (VA), as measured at input to isolation transformer
(if no limits are set for VA, many signs on a circuit can have significant effect on
upstream equipment):
1 module, or 1 - 1.5 meter (3 - 5-foot) length -
150 VA
2 modules, or 1.5- 2 meter (5 - 7-foot) length - 250 VA
3 modules, or 2.5 - 3.5 meter (8 - 12-foot) length -300 VA
4 modules, or 4+ meter (13+) length -
400 VA
13-16.5.2
Power Factor - minimum 0.85 at all intensity steps.
13-16.5.3
External disconnect switch that shorts secondary of isolation transformer
when switch is turned off.
13-16.5.4
Tethers - minimum 2 per sign.
13-16.5.5
Average luminance:
13-16.5.5.1 Types L-858Y, L & R Sign, white or yellow legend or background: 34-100
cd/m2 (10-30 footlamberts), with 55-100 cd/m2 (16-30 footlamberts) at two highest
intensity steps The ratio of any two measurements on any part of the sign (yellow or
white portion) must not be greater than 6:1.
13-16.5.5.2 Type L-858R Sign (mandatory): Ratio between message (white) and
background (red) will not be more than 10:1 or less than 5:1.
13-16.5.5.3 Type L-858B Sign (RDM): 100-300 cd/m2 (30-88 footlamberts) (white).
13-16.5.6
Compatible with all L-828/L-829 regulators. Sign manufacturer must
assure that pulsed demand of sign will synchronize with pulsed output of regulator.
Unacceptable synchronization may be evidenced by sign flickering, abnormal noises
from regulator, failure to stabilize by 1 second after change of intensity steps, or spikes
on the output current or voltage waveforms. The sign should not require field adjustment
for proper operation following changes in circuit loading or regulator type. The sign
manufacturer should analyze the regulator output waveforms to verify that signs will
perform satisfactorily and without adversely impacting the regulator, at all load
conditions from no- to full-load capacity.
13-16.5.7
Operation to be at any incoming current value of a series lighting circuit.
Rated operating lamp life: Minimum 2,500 hours (when operated at highest intensity
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