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The NEMA 5-15 plug has two flat parallel blades like NEMA 1-15, but also adds a ground (earth) pin. It is rated 15 A at 125 volts. The ground (earth) pin is longer than the line and neutral blades, so the device is grounded before the power is connected. Both current-carrying blades on grounding plugs are normally narrow, since the ground (earth) pin enforces polarity. NEMA 1-15 plugs are also compatible with NEMA 5-15 sockets. This socket is recommended in IEC standard 60906-2 for 120 volt 60 Hz installations. Looking directly at a NEMA 5-15 socket in the commonly found orientation of ground (earth) at the bottom, the neutral slot is on the left, and the line slot is on the right. However, in the US the National Electrical Installation Standards (NECA 130-2010) specifies that the ground hole should be on top. Sideways installation is also permitted; in this case, NECA 130-2010 specifies the neutral (long) slot is on top and the ground hole on the left.