8 . 2
R I G G I N G WA R N I N G S
WARNING:
Suspending anything, especially overhead of people, should be done with
extreme caution. Always engage the services of a certified professional who is qualified to
determine and implement the requirements for overhead rigging. Only persons with the
knowledge of proper hardware and safe rigging techniques should attempt to suspend
NTS250 arrays overhead. Failure to follow these precautions may result in damage to the
equipment, injury, or death.
DANGER:
When suspending or stacking NTS250s, avoid placing any parts of the body
between the enclosures or between an enclosure and the Fly Bar. Always use the integral
handles to lift or position enclosures. Failure to follow this precaution may result in damage to
the equipment, injury, or death.
CAUTION:
Because an NTS250 weighs approximately 58 kg / 127 lb, always use two people
or mechanical assistance to lift a NTS250. Always use proper lifting techniques to avoid injury.
Please see Section 4 “Rigging / Mounting / Suspension” and Section 5 “Rigging Design” in the
accompanying EAW Loudspeaker Owner’s Manual for additional, important rigging information.
8 . 3
P E R M A N E N T I N S TA L L AT I O N S U S P E N S I O N
8.3.1
PI ARRAY WORKING LOAD LIMIT (WLL)
WARNING
: When four (4) M10 threaded Permanent Installation (PI) suspension points are
used the array Working Load Limit (WLL), Total Vertical Pull, is limited to ten (10) NTS250
Subwoofers. In order to obtain full WLL, all four (4) M10 threaded Permanent Installation (PI)
suspension points must be vertically attached to the support structure, and the array must be
suspended vertically. Any other method of attachment or hanging configuration will de-rate the
WLL and maximum number of subwoofers.
WEIGHTS: NTS250 Loudspeaker: 58 kg / 127 lb
8.3.2
A NOTE ON EYEBOLTS
Load-rated eyebolts are commonly used with threaded suspension points. Eyebolts used with
NTS250 subwoofers must possess the following attributes:
Type: Shoulder
pattern
Thread Size:
M10 x 1.5
Shank Length:
Minimum 35 mm
WLL:
Use appropriately rated eyebolt for application.
CAUTION:
Eyebolt Working Load Limits are significantly de-rated when
angular lifts are applied. If an application requires an angular lift greater than 45 degrees a
swivel hoist ring or similar fitting must be used – see Figure to the right. These fittings have
full swivel and pivot action, which helps avoids side loads.
8.3.3
PERMANENT INSTALLATION OVERVIEW
The NTS250 enclosures may be suspended in a permanent installation without the accessory FB152
Fly Bar. In these applications user-supplied M10 x 1.5 x 35 mm forged shoulder eyebolts or load-
rated equivalent are installed in an array’s top enclosure.
The following instructions pertain specifically to eyebolt installation and array handling when using
said eyebolts. Join enclosures within an array by following the procedures described in the
accompanying FB152 Rigging & Ground Stack Instructions.
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