SMA AUTOMATIC SWITCH BOX M-20 - Manual (Page 39)

SMA Solar Technology AG 5 Electrical Connection
Installation Guide AS-BOX-M_L-IA-IEN110320 39
1. Insert the cable (see section 5.2).
2. Connect PE to terminal strip "AS-X1/ Load Meter". Take the labeling on the connection terminals
into account.
3. If a TN system is present:
– Bridge the connection terminal "N-TT" and
"N-TN" of the terminal strip "AS-X1/ Load
Meter" by using a push-in type jumper bar. Take
the label "TN-TT" in the Automatic Switch Box
into account.
– Connect N to connection terminal "N-TN" of the terminal strip "AS-X1/ Load Meter". Take
the label "TN-TT" in the Automatic Switch Box into account.
4. If a TT system is present:
– If connection terminals "N-TT" and "N-TN" of the terminal strip "AS-X1/ Load Meter" are
bridged, remove the bridge.
– Connect N to connection terminal "N-TT" of the terminal strip "AS-X1/ Load Meter". Take the
label "TN-TT" in the Automatic Switch Box into account. The second connection terminal
"N-TT" is not assigned.
5. Connect L1, L2 and L3 to terminal strip "AS-X1/ Load Meter". Take the labeling on the
connection terminals into account.