This can be the case for DIY electrical work, especially if with electrical outlets. According to Nonprofit Home Inspections ...

including portable booster batteries and even jumper cables that plug into a 12V outlet inside the car. Those plug-in cables will never be connected with reverse polarity, but they might not be ...

They identify outlets that are open ground, open hot or open neutral; hot, hot on neutral, or ground reversed with open hot; and which have faulty wiring or reverse polarity. Receptacle testers can ...