Tables
Table 6
Last span of overhead service entrance This table is based on clearances in CAN/CSA-C22.3 No. 1. Type of line Voltage
Conductor type
Maximum length of span nearest to line (m)
Single-phase 120 V**
Duplex 4 NS75 (NS1) NS75 FT1 (NSF2)
38 38
Single-phase 120/240 V
Triplex 2 NS75 (NS1) NS75 FT1 (NSF2)
30 30
Triplex 2/0 NS75 (NS1) NS75 FT1 (NSF2)
25 25
Triplex 4/0 NS75 (NS1) NS75 FT1 (NSF2)
25 21
3 separate conductors No. 477 covered
Must be guyed (max. 6 m unguyed if max. tension = 100 N or 10 kg)*
Quadruplex 2 NS75 (NS1) NS75 FT1 (NSF2)
30 28
Quadruplex 4/0 (NS1) NS75 FT1 (NSF2)
21 18
4 separate conductors No. 477 covered
Must be guyed (max. 6 m unguyed if max. tension = 100 N or 10 kg)*
Three-phase 347/600 V and 600 V
* The maximum 6-m span nearest the line must not be taut (maximum: 100 N or 10 kg). ** For public lighting only Ref.: Sections 2.6.2, 2.7.2.5, 4.2 e) and Figure 2.17 Note: Parallel conductors are allowed provided that they are installed as specified in the Code.