Miller Vi-Go, Руководство пользователя

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U s e r I n s t r u c t i o n s - E n g l i s h
3.0 System Requirements
Before installation of a Vi-Go System, the structure or ladder on which the system is to be affixed must be certified
to be capable of withstanding the potential loads that may be applied in the event of a fall arrest and must meet
the specified ladder requirements.
Ladder Requirements
A ladder must be a fixed ladder with rungs having outer diameters between 3/4 inch and 1-1/8 inches. According
to ANSI A14.3, the minimum width of the ladder should be 18 inches from inside rail to inside rail.
A system may be attached to square, diamond or L-shaped (angle iron) rungs so long as the rungs meet the mini-
mum 3/4 inch and maximum 1-1/8 inches outer diameter requirements. A spacer may be required for angle iron
installations.
Top Bracket
Connection loads include system pretension and forces generated by arresting a fall. The load requirements vary
due to number of users on the system and installation to the structure (i.e., number of rung clamp assemblies
used).
For calculation purposes in determining the load each ladder rung must be able to withstand, assume the maxi-
mum load on each bracket is distributed evenly throughout the number of top bracket rung clamp assemblies.
[Example: Based on a single-user system with the top bracket installed with three rung connections, the assumed
load for each rung would be 1,100 lbs. (3,300/3).] An additional top bracket rung clamp assembly can be pur-
chased separately and used to spread the load requirements over four (4) rungs rather than three (3). [Example:
For a system with two (2) users the loads transmitted to each rung is reduced from 1,267 lbs. (3,800/3) to 950 lbs.
(3,800/4).]
Number of Simultaneous Users Maximum Load (lbs.)*
For Vi-Go AUTOMATIC and MANUAL Systems:
1 3,300 lbs.
2 3,800 lbs.
3 4,300 lbs.
4 4,800 lbs.
*The maximum load calculations provide a 2:1 safety factor.
Bottom Bracket
The bottom bracket connection must be capable of supporting a system load of 750 lbs. in the direction of loading.
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