The second figure represents the level of liquid protection. Here is a chart that displays the IP Code rankings.

IP Rating	Size of Object Protected Against	Examples of Objects Protected Against
IP 0X	No protection	None
IP 1X	> 50 mm	Large surface of body, but not deliberate contact (back of hand vs finger)
IP 2X	> 12.5 mm	Smaller objects and fingers
IP 3X	> 2.5 mm	Thick wires or tools
IP 4X	> 1 mm	Screws, nails, wires
IP 5X	Dust protected	Some dust may enter, but cannot interfere with operation
IP 6X	Dust tight	No ingress of dust at all

The amount of ingress protection is specified in the NEMA 250 test standard. It also discusses the minimal specifications for enclosure design. Determining protection against solids and liquids is part of the electrical enclosure testing process, which pertains to the level of ingress protection.

Unlike IEC 60529, which provides an IP Code rating, NEMA 205 testing provides an enclosure rating. For national electrical manufacturers, this ranking is significant. It details the certification, testing, and NEMA type. The enclosure ratings and the corresponding protective needs are displayed in the chart below.

Type	Solid	Liquid
Type 1	Falling dirt	No protection
Type 2	Falling dirt	Dripping and light splashing water
Type 5	Falling dirt, settling airborne dust, fibers, flyings and lint	Dripping and light splashing water
Type 12	Falling dirt, circulating dust, fibers, flyings and lint	Dripping and light splashing water; seepage and light splashing of oil and non-corrosive coolants
Type 13	Falling dirt, circulating dust, fibers, flyings and lint	Dripping and light splashing water; seepage, light splashing and spraying of oil and non-corrosive coolants
Type 3	Windblown dust and falling dirt	Water from sleet, snow and windblown rain
Type 3R	Falling dirt	Water from falling rain, sleet and snow
Type 4	Windblown dust and falling dirt	Water directed from a hose or from rain, sleet, snow and splashing water
Type 4X	Windblown dust and falling dirt	Water directed from a hose or from rain, sleet, snow and splashing water; increased corrosion protection
Type 6	Falling dirt	Hose directed water and submersion that is temporary and at a limited depth
Type 6P	Falling dirt	Hose directed water and submersion that is prolonged and at a limited depth

Note that NEMA 250 Types 1, 2, 5, 12, and 13 are exclusively intended for indoor use. Every other variety is both indoors and outside. For marketing purposes, the NEMA electrical enclosure rating is frequently utilized. For many applications, cases with electrical enclosure certification and that pass the electrical enclosure water test are necessary.

Comparable to NEMA 250, UL 50 specifies protection levels and design requirements. In essence, it's an IP code for an electrical casing. The levels of protection from liquids and solids for each type of enclosure are listed in the chart below.