6
Always wear hard heads, safety shoes, sound
protection and protective gloves when moving,
sembling, disassembling or transporting truss
elements.
Assembled trusses and structures must be checked on their
structural stability and strength by a chartered engineer.
Do not mix structural data from different
standards without knowing their respective safety
principles like Load Resistance Factor Design or
Allowable Stess Design methodology.
Do not use of damaged or malfunctioning parts.
5.1 ELECTRICAL POTENTIAL BONDING
The user needs to ensure that truss systems that might
develop dangerous touch voltages in the event of an electrical
fault are incorporated into a common potential equalisation
system. This applies to all elements made of electro
conductive material which have equipment placed on, or
attached to, them or across which wires and cables run that,
in the event of damage, could make electrical contact with
metal parts. The connections can be made with clips, pipe
clamps, screw joints or special single-pole locking connectors.
The common potential equalisation system must be connected
to the earth wire of the electrical power supply system. For cable
lengths of up to 50 metres, 16 mm2Cu is considered the
standard value for an adequate cross-section. For cable lengths
of up to 100 metres, the standard value is 25 mm2Cu. In truss
tower systems, the potential equalisation connection can be
made by means of a potential equalisation connection point
provided by the manufacturer at the tower base. Since the
wheels or rollers used in tower systems with „sleeve blocks“
insulate the movable part of the truss construction, the latter
must be provided with a separate potential equalisation
connection.
Grounding trusses is extremely important as
very often audience and installers will come in
direct contact while the fixtures suspended are
electrically charged.
6. TRANSPORT AND STORAGE
Always wear hard heads, safety shoes, sound
protection and protective gloves when moving,
assembling, disassembling or transporting truss
elements.
Treat the truss with care. Don’t drop, drag or throw
them. Prevent damage from sharp edges such as
the forks
of a forklift. Use dedicated dollies as
means
for transportation and storage.
Avoid verticaltransportationor stocking for reasons of falling.
Avoid physical contact with unprotected steel at all
times.
Makesuretrusses cannotmove
or shakeduringtransport.Due to
the softness
of the aluminium the abrasive working of moving or
shaking can lead to severe damage.
7. APPROVED ACCESSORIES
For an
overview of approved accessories, we refer to our
brochure or our website: www.sixty82.com.
It is of great importance that accessories never damage
the truss.
Special
attention shall be taken at using clamps
and hooks. It
might very well be that their inside
radius does not
meet the tube size it needs to be
connected to. This can lead to severe damage.
8. COATINGS AND SURFACE
TREATMENTS
Coatings and surface finishes shall only be applied after
consultation with the coating or finish manufacturer or other
parties qualified to evaluate the possible effects of the coating
or surface finish on the structural properties and load - bearing
capabilities of the truss. Only use curing process of tempratures
of 200dgr or lower for per period of 10 minutes.
Records shall be kept detailing the application of any coating or
surface finish with particular attention to processes requiring the
application of heat.
Chemical removal of coatings and surface finishes shall be
carried out only after consulting with the chemical manufacturer
to ensure that the chemical will not affect the mechanical
properties of the aluminium.
The use of Abrasion-blasting shall be treated with great care. It
is adviced not to be used on aluminium less than or equal to 3
mm thick.
9. SLINGING METHODS
There are many ways of slinging a truss. At all times strength and
stability must be guaranteed. However, the correct way depends
on many aspects and the application.
Based on loading a truss to its maximum, it is advised
to sling trusses as per instruction given. These methods:
•Guarantee strength when attached in the node or
directly next to the end brace. (within 50mm)
•Guarantee that the hanging point is above the truss
centre of gravity
•Give redundancy in case one sling fails
•Minimise the horizontal compression of main chords
Slingingshallbeapplied solely at themain chords, not at
the couplers or internal braces unless approved by a
chartered engineer.
Slingingshallbeappliedatnodepoints,asideendbraces
or aside horizontal cross braces.
Slinging equipment shall be made from non-
abrasive and fire-retardant materials.
