prohibition of family contact. The means of family contact may only be restricted for a limited time period and as strictly required for the maintenance of security and order. Mandela Rule 44 For the purpose of these rules, solitary confinement shall refer to the confinement of prisoners for 22 hours or more a day without meaningful human contact. Prolonged solitary confinement shall refer to solitary confinement for a time period in excess of 15 consecutive days. Mandela Rule 45 1 Solitary confinement shall be used only in exceptional cases as a last resort, for as short a time as possible and subject to independent review, and only pursuant to the authorization by a competent authority. It shall not be imposed by virtue of a prisoner’s sentence. 2 The imposition of solitary confinement should be prohibited in the case of prisoners with mental or physical disabilities when their conditions would be exacerbated by such measures. The prohibition of the use of solitary confinement and similar measures in cases involving women and children, as referred to in other United Nations standards and norms in crime prevention and criminal justice, continues to apply. Instruments of restraint Mandela Rule 47 1 The use of chains, irons or other instruments of restraint which are inherently degrading or painful shall be prohibited. 2 Other instruments of restraint shall only be used when authorized by law and in the following circumstances: (a) As a precaution against escape during a transfer, provided that they are removed when the prisoner appears before a judicial or administrative authority; (b) By order of the prison director, if other methods of control fail, in order to prevent a prisoner from injuring himself or herself or others or from damaging property; in such instances, the director shall immediately alert the physician or other qualified healthcare professionals and report to the higher administrative authority. Mandela Rule 48.1 When the imposition of instruments of restraint is authorized in accordance with paragraph 2 of rule 47, the following principles shall apply: (a) Instruments of restraint are to be imposed only when no lesser form of control would be 64