Tables
Table 2
Service voltage limits – Allowable range At supply point (in volts)
Type of line
Nominal voltage (volts)
Extreme operating conditions Normal operating conditions
Single-phase 120/240
106/212
110/220
125/250
127/254
Three-phase 4 conductors 120/208Y 347/600Y
110/190 306/530
112/194 318/550
125/216 360/625
127/220 367/635
Three-phase 3 conductors 600
530
550
625
635
At point of use (at load point) (in volts)
Type of line
Nominal voltage (volts)
Extreme operating conditions Normal operating conditions
Single-phase 120/240
104/208
108/216
125/250
127/254
Three-phase 4 conductors 120/208Y 347/600Y
108/187 300/520
110/190 312/540
125/216 360/625
127/220 367/635
Three-phase 3 conductors 600
520
540
625
635
Notes: Normal operating conditions – No improvements or corrective measures are required. Extreme operating conditions – Improvements or corrective measures must be planned based on an established program, but immediate action is not necessarily required. Ref.: Section 2.6.2 and CAN3-C235-83 (C2000)