An installation is a combination of materials and labour, so that good workmanship must be matched by sound manufactured products. Since most electrical installation materials are made to a high standard, it is during the period of installation that great care is required to ensure that they remain in as near perfect a condition as possible. Thus the materials must be carefully handled to avoid damage, otherwise faulty components may be inadvertently installed, which could lead to serious consequences at a later date. Even small cracks in PVC boxes permit the entry of moisture, which might form leakage paths. Dirt and grease on installed items could also result in leakage and render them unsafe.
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