Figure 56: Splicing Offset Horizontal Bus - Hach sc200 User Manual

80459-641-01E
10/2012
Figure 56: Splicing Offset Horizontal Bus
Rear
Captive nut
Front
Conductor Entry
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To splice a horizontal bus on the left side of the structure, follow these steps:
1. Turn off all power supplying this equipment before working on or inside
the equipment, and follow lockout/tagout procedures. Always use a
properly rated voltage sensing device to confirm the power is off.
2. Join sections together following the appropriate steps beginning at
"Locating the MCC" on page 18 and continuing through page 34. This
provides proper alignment of the horizontal bus.
3. Position the rear splice bar (bar with captive nuts; see Figure 56) against
the back face of the rear horizontal bus bar.
4. Install a plain splice bar between each lamination of horizontal bus; install
the last bar against the front face of the horizontal bus (see Figure 56).
5. Align the four mounting holes in the splice bus and the horizontal bus.
Splice bars
6. Re-install the two left bolts through the splice assembly and into the
horizontal bus. Make sure the original conical washers are re-installed
with the concave side facing the splice bus (see Figure 39 on page 39).
Torque these bolts to 31–32 lb-ft (41.87–43.22 N•m) (see Figure 56). If
the optional 85,000 A bus bracing is supplied, torque the center nut to
70 lb-ft (94.92 N•m).
7. Repeat Steps 2–6 for each of the three horizontal bus phases.
8. Before energizing the equipment, replace all covers and barriers.
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Apply appropriate personal protective equipment (PPE) and follow safe
electrical work practices. See NFPA 70E or CSA Z462.
• This equipment must only be installed and serviced by qualified
electrical personnel.
• Turn off all power supplying this equipment before working on or inside
equipment.
• Always use a properly rated voltage sensing device to confirm power is
off.
• Replace all devices, doors, and covers before turning on power to this
equipment.
Failure to follow this instruction will result in death or serious injury.
Conduit entry space is provided at the top and bottom of the MCC structure.
The top plates (and closing plates in bottom, if present) are removable for
convenience in wiring and cutting conduit openings). A hinged door allows
access to the main lug, main circuit breaker, or main switch compartment. In
some cases, the horizontal wire trough cover must be removed.
Pull boxes are available if additional wiring space is required.
Cable connection torque values are listed in Table 4 and Table 5 on page 51.
Model 6 Motor Control Centers
Section 4—Installing the MCC
DANGER
45