Magnum Energy Magnum Panel (MP Series) - Manual (Page 47)

Page 40 © 2011 Magnum Energy, Inc.
3.0 Installation
3.6.5 AC Conductor Wiring
The following steps are basic guidelines for installing and connecting the AC wiring to and from the
inverter (refer to Figures 3-17 thru 3-19 depending on your particular model). Also see Section
4.0 for the specifi c wiring diagrams for you particular MP enclosure.
WARNING: To prevent electrical shock, make sure all AC power (inverter, generator,
or utility) is off before making any AC connections inside the MP enclosure.
Wiring External AC Source and AC Load Panel
1. Route appropriate wires/cables from a dedicated breaker in the AC electrical main panel through
one of the MP enclosure’s knockouts to the AC input busbars (INPUT FROM GEN/GRID).
2. Route appropriate wires/cables (determined from Table 3-4) from the AC input busbars (OUTPUT
TO INVERTER LOADS) through another MP enclosure knockout to the AC electrical sub-panel.
CAUTION: When connecting external AC wires to the MP enclosure, the proper phasing
sequence (i.e., LEG 1/HOT 1 = Black, and LEG 2/Hot 2 = Red) should be maintained
throughout the installation process. Refer to the system installation drawings in Section
4.0 showing the proper phasing convention. In the event the power conductors from
the external AC source (i.e., generator or grid) or the wiring into or out of the inverters
are not phased correctly, damage may occur.
Wiring Inverter AC Input/Output
1. Route the inverter’s AC input wires (previously connected in Section 3.3.3) to the top of the
inverter AC input breaker(s) inside the MP enclosure (INPUT TO INVERTER).
2. Route the inverter’s AC output wires (previously connected in Section 3.3.3) to the inverter
AC output busbars inside the MP enclosure (OUTPUT FROM INVERTER).
AC Wiring Inspection
After verifying all AC connections are correct, and all AC terminal screws are torqued correctly
(refer to Tables 3-1 to 3-3), replace the covers on the main electrical panel/sub-panel.
3.6.4 External AC Wires and Overcurrent Protection
The MP enclosure also provides a full system AC branch-rated circuit breaker – as part of the AC
bypass switch. This AC breaker can be used as the overcurrent protection and disconnect for the
total current that the MP enclosure system provides to the inverter’s AC electrical sub-panel. This
is true as long as the wires routed from the MP enclosure to the inverter’s AC electrical sub-panel
are no smaller than those listed in Table 3-5 for your particular MP enclosure model. If you are
using other circuit breakers or wire sizes, refer to the appropriate electrical codes for proper sizing
requirements.
Table 3-5, Minimum AC Wire Size for AC Output Breaker
MP Enclosure
Model
AC Output Breaker
(part of Bypass
Assembly)
Conductor Temperature Rating
75°C (167°F) 90°C (194°F)
MPSL-30D 60 amps #6 AWG (65 amps) #6 AWG (75 amps)
MPSL-60S 60 amps #6 AWG (65 amps) #6 AWG (75 amps)
MPSH-30D 125 Amps #1 AWG (130 amps) #2 AWG (130 amps)
MPDH-30D 125 Amps #1 AWG (130 amps) #2 AWG (130 amps)
Note - The recommended minimum wire sizes listed above are based on using copper wire with a minimum
rating of 300V and at an ambient temperature of 30°C (86°F). If more than three cables are used together,
a cable fi ll factor de-rating may be needed. The insulation of the wire must be rated for the environmental
condition in which it will be used (i.e., for residential use, THHN is commonly used).
Note - Refer to Section 3.11 to asssit in determining the appropiate ground conductors for the AC system
based on the conductors used to/from the MP enclosure.