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| K.Sup21 : ITU-T K.21 - Rationale for setting resistibility requirements of telecommunication equipment installed in customer premises against lightning | 
| 
| In force components |  
| Number 
 | Title | Status |  
| K.Sup21 (05/21) 
 | ITU-T K.21 - Rationale for setting resistibility requirements of telecommunication equipment installed in customer premises against lightning | In force 
 |  
| 
 |  
| Superseded and Withdrawn components |  
| Number 
 | Title | Status |  
| K.Sup21 (10/20) 
 | Rationale for setting resistibility requirements of telecommunication equipment installed in customer premises against lightning | Superseded 
 |  |