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NEMA Watertight Hubbell Twist-Lock System
Rating					IP66 Suitability
Configuration Male/Female	Voltage	Amperage	Wires	Poles	Plug	Inlet	Connector	Receptacle	Adapter
NEMA L5-20	125V AC	20 amps	3 Wires	2 Poles	HBL2311SW	HBL2315SW	HBL2313SW	HBL2310SW	Custom
NEMA L6-20	250V AC	20 amps	3 Wires	2 Poles	HBL2321SW	HBL2325SW	HBL2323SW	HBL2320SW	Custom
NEMA L7-20	277V AC	20 amps	3 Wires	2 Poles	HBL2331SW	HBL2335SW	HBL2333SW	HBL2330SW	Custom
NEMA L14-20	125/250V AC	20 amps	4 Wires	3 Poles	HBL2411SW	HBL2415SW	HBL2413SW	HBL2410SW	Custom
NEMA L15-20	3Ø 250V AC	20 amps	4 Wires	3 Poles	HBL2421SW	HBL2425SW	HBL2423SW	HBL2420SW	Custom
NEMA L16-20	3Ø 480V AC	20 amps	4 Wires	3 Poles	HBL2431SW	HBL2435SW	HBL2433SW	HBL2430SW	Custom
NEMA L21-20	3ØY 120/208V AC	20 amps	4 Wires	4 Poles	HBL2511SW	-	HBL2513SW	HBL2510SW	Custom
NEMA L5-30	125V AC	30 amps	3 Wires	2 Poles	HBL2611SW	HBL2615SW	HBL2613SW	HBL2610SW	Custom
NEMA L6-30	250V AC	30 amps	3 Wires	2 Poles	HBL2621SW	HBL2625SW	HBL2623SW	HBL2620SW	Custom
NEMA L14-30	125/250V AC	30 amps	4 Wires	3 Poles	HBL2711SW	HBL2715SW	HBL2713SW	HBL2710SW	Custom
NEMA L15-30	3Ø 250V AC	30 amps	4 Wires	3 Poles	HBL2721SW	HBL2725SW	HBL2723SW	HBL2720SW	Custom
NEMA L16-30	3Ø 480V AC	30 amps	4 Wires	3 Poles	HBL2731SW	HBL2735SW	HBL2733SW	HBL2730SW	Custom
NEMA L17-30	3Ø 600V AC	30 amps	4 Wires	3 Poles	HBL2741SW	HBL2745SW	HBL2743SW	HBL2740SW	Custom
NEMA L21-30	3ØY 120/208V AC	30 amps	4 Wires	4 Poles	HBL2811SW	HBL2815SW	HBL2813SW	HBL2810SW	Custom

NEMA Environmental Ratings

NEMA Enclosure Type Number	Basic Description
1	Indoor enclosures which protect personnel from incidental contact and also protect against falling dirt.
2	Indoor enclosures which protect personnel from incidental contact, protect against falling dirt, and protect against dripping and light splashing of non-corrosive liquids.
3	Indoor/outdoor enclosures which protect personnel from incidental contact, protect against falling dirt, rain, sleet, snow, and windblown dust and protect against external ice.
3R	Indoor/outdoor enclosures which protect personnel from incidental contact, protect against falling dirt, rain, sleet, and snow, and protect against external ice.
3S	Indoor/outdoor enclosures which protect personnel from incidental contact, protect against falling dirt, rain, sleet, snow, and windblown dust and protects external mechanisms from ice.
4	Indoor/outdoor enclosures which protect personnel from incidental contact, protect against falling dirt, rain, sleet, snow, windblown dust, splashing water, and hose-directed water and protect against external ice.
4X	Indoor/outdoor enclosures which protect personnel from incidental contact, protect against falling dirt, rain, sleet, snow, windblown dust, splashing water, hose-directed water, and corrosion and protect against external ice.
5	Indoor/outdoor enclosures which protect personnel from incidental contact, protect against falling dirt, settling airborne dust, lint, fibers, and flyings, and protect against dripping and light splashing of non-corrosive liquids.
6	Indoor/outdoor enclosures which protect personnel from incidental contact, protect against falling dirt, rain, sleet, snow, hose-directed water and temporary submersion at a limited depth, and protect against external ice.
6P	Indoor/outdoor enclosures which protect personnel from incidental contact, protect against falling dirt, rain, sleet, snow, hose-directed water, corrosion, and prolonged submersion at a limited depth, and protect against external ice.
7	Indoor enclosures for use in hazardous locations classified as Class I, Division 1, Groups A, B, C, or D as defined in NFPA 70.
8	Indoor/outdoor Enclosures for use in hazardous (Classified) locations classified as Class I, Division 1, Groups A, B, C, and D as defined in NFPA 70.
9	Indoor enclosures for use in hazardous locations classified as Class II, Division 1, Groups E, F, or G as defined in NFPA 70.
10	Enclosures that meet the Mine Safety and Hestyle="width: 90px; height: auto" alth Administration requirements, 30 CFR, Part 18.
12	Indoor enclosures without knockouts which protect personnel from incidental contact, protect against falling dirt, circulating dust, lint, fibers, and flyings, dripping and light splashing of non-corrosive liquids, and light splashing and seepage of oil and non-corrosive coolants.
12K	Indoor enclosures with knockouts which protect personnel from incidental contact, protect against falling dirt, circulating dust, lint, fibers, and flyings, dripping and light splashing of non-corrosive liquids, and light splashing and seepage of oil and non-corrosive coolants.
13	Indoor enclosures which protect personnel from incidental contact, protect against falling dirt, circulating dust, lint, fibers, and flyings, and spraying, splashing, and seepage of water, oil, and non-corrosive coolants.

*NEMA ratings provide "a degree of protection" (not absolute protection).

IP Rating Chart

Ingress Protection (IP) Rating
IP Number	First Digit - Protection from Solids	IP Number	Second Digit - Protection from Liquids
0	Not protected from solids.	0	Not protected from liquids.
1	Protected against solid objects over 50 mm, e.g. accidental touch by persons hands.	1	Protection against vertically falling drops of water e.g. condensation.
2	Protected against solid objects over 12 mm, e.g. persons fingers.	2	Protection against direct sprays of water up to 15° from the vertical.
3	Protected against solid objects over 2.5 mm (tools and wires).	3	Protected against direct sprays of water up to 60° from the vertical.
4	Protected against solid objects over 1 mm (tools, wires, and small wires).	4	Protection against water sprayed from all directions - limited ingress permitted.
5	Protected against dust limited ingress (no harmful deposit).	5	Protected against low pressure jets of water from all directions - limited ingress.
6	Totally protected against dust ingress.	6	Protected against temporary flooding of water, e.g. for use on ship decks - limited ingress permitted.
7	–	7	Protected against the effect of immersion between 15 cm and 1 M.
8	–	8	Protects against long periods of immersion under pressure.
9k	–	9k	Protected against close range high pressure, high temperature water jet.

Popular IP Ratings
IP Code	First Digit - Protection from Solids	Second Digit - Protection from Liquids
IP10	Protected against solid objects over 50 mm, e.g. accidental touch by persons hands.	Not protected from liquids.
IP11	Protected against solid objects over 50 mm, e.g. accidental touch by persons hands.	Protection against vertically falling drops of water e.g. condensation.
IP14	Protected against solid objects over 50 mm, e.g. accidental touch by persons hands.	Protection against water sprayed from all directions - limited ingress permitted.
IP20	Protected against solid objects over 12 mm, e.g. persons fingers.	Not protected from liquids.
IP44	Protected against solid objects over 1 mm (tools, wires, and small wires).	Protection against water sprayed from all directions - limited ingress permitted.
IP52	Protected against dust limited ingress (no harmful deposit).	Protection against direct sprays of water up to 15° from the vertical.
IP54	Protected against dust limited ingress (no harmful deposit).	Protection against water sprayed from all directions - limited ingress permitted.
IP55	Protected against dust limited ingress (no harmful deposit).	Protected against low pressure jets of water from all directions - limited ingress.
IP56	Protected against dust limited ingress (no harmful deposit).	Protected against temporary flooding of water, e.g. for use on ship decks - limited ingress permitted.
IP65	Totally protected against dust ingress.	Protected against low pressure jets of water from all directions - limited ingress.
IP66	Totally protected against dust ingress.	Protected against temporary flooding of water, e.g. for use on ship decks - limited ingress permitted.
IP67	Totally protected against dust ingress.	Protected against the effect of immersion between 15 cm and 1 M.
IP68	Totally protected against dust ingress.	Protects against long periods of immersion under pressure.

Conversion of NEMA Type Numbers to IEC Class Designations
NEMA Enclosure Type Number	IEC Enclosure Class Designation	Description
1	IP10	General Purpose
2	IP11	Drip-proof - Indoor
3	IP54	Dust-tight, Rain-tight and Sleet (Ice) Resistant - Outdoor
3R	IP14	Rainproof and Sleet (Ice) Resistant - Outdoor
3S	IP44, IP54	Dust-tight, Rain-tight, and Sleet (Ice) Proof - Outdoor
4	IP56	Watertight and Dust-tight - Indoor and Outdoor
4X	IP56	Watertight, Dust-tight and Corrosion-Resistant - Indoor and Outdoor
5	IP52	Superseded by Type 12 for Control Apparatus
6	IP67	Submersible, Watertight, Dust-tight and Sleet (Ice) Resistant - Indoor and Outdoor
12	IP52	Industrial Use, Dust-tight and Drip-tight - Indoor
12K	IP52	Industrial Use, Dust-tight and Drip-tight with Knockouts - Indoor
13	IP54	Oil-tight and Dust-tight - Indoor