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L2275
Emax UL
10/132
Doc. N°
Mod.
RH0109002
Apparatus
Scale
Page N°
Fig. 18
Fig. 19
XV
2
2
3
3
4
2
6
3
2
2
3
3
4
2
6
3
M12 / 1/2" high resistance screws
Tightening torque of the main terminals: 70 Nm / 584 lb. ft.
5.1.3
Assembly procedures for the connection busbars
Check the state of the contact surfaces of the connections very carefully: these must be very clean and free of burrs, dents or traces of oxidation,
which must be eliminated using a fine file or an emery cloth to prevent localized increases in temperature. On completion of the operation, remove
all traces of grease or dust with a cloth soaked in a suitable solvent.
When copper connections are used, it is advisable to tin-plate the contact surfaces. When aluminium connections are used, it is advisable to apply
a thin layer of Vaseline over the contact surfaces.
The connections must not exert any force on the terminals in any direction.
Always interpose a flat washer of good diameter and a spring washer between them (to spread the tightening pressure over a greater area).
Make the contact between connection and terminal and fully tighten the fixing screws.
Always use two wrenches (so as not to stress the insulating parts excessively), applying the tightening torque indicated in figure 11. Check the
tightening after 24 hours. Fig. 18. Check tightening after 24 hours.
Cradle terminals
No. screws for phase
No. screws for neutral
Fixed power circuit breaker terminals
No. screws for phase
No. screws for neutral
5.2
Grounding
The fixed version power circuit breaker and the cradle of the draw out power circuit breaker have one or two terminals on the rear, marked with
the special symbol, for connection to ground (Fig. 9 and Fig. 12).
Each terminal is complete with a bolt for fixing the connection.
A conductor with cross-section conforming to the Standards in force must be used for the connection.
Before assembling the connection, clean and degrease the area around the screw.
After assembly, tighten the bolt with a torque of 70 Nm / 584 lb. ft.
5.3
Cabling the power circuit breaker auxiliary circuits
5.3.1
Interfacing elements for fixed power circuit breaker
A special terminal box is provided fitted with screw terminals for connection of the auxiliary circuits.
The terminals are marked with alphanumerical identification codes as per the electrical circuit diagram.
The terminal box is identified by the code XV on the electrical circuit diagram.
There is immediate access to the terminal box when the compartment door is open.