MEA 2020 NEC Code Update - Part 3 4- hours Articles 400 590 - Electrical Association

MEA 2020 NEC Code Update – Part 3
   4- hours Articles 400 – 590

Course information
 This seminar will satisfy 4 hours of electrical code study required for continuing education for
 renewal of electrical licensing by the State of Minnesota.
 Disclaimer: Through the presentation of this course and or these materials, no representation actual
 or implied, is made that the trainer or MEA/ETN is setting or enforcing specific standards or is
 providing peer review, certification, accreditation, or product endorsement or testing. MEA has no
 proprietary interest in the materials or products used in this presentation.
 The material is adapted from the 2020 NEC ® - NFPA 70. Actual code articles in their entirety are
 required to maintain compliance .
 First update is the type of change that occurred in blue
 Second item is where the change occurred in purple
 Third item is paraphrased information in black
 Additional explanatory information in green
Copyright 2019 Electrical Association.

Introduction
General formatting of 2020 NEC

New material is marked in the margin by N rather than a vertical line in the margin

Where one or more paragraphs have been deleted, a dot • appears in the margin

Revisions are shaded text

Changes in the written content or deleted words is        Δ

Learning outcomes: part 1

TIA and Errata for 2020 NEC®

Chapter 4 Equipment
  for General Use

400

CHANGE: 400.12 Flexible cords and Flexible cables – Uses not permitted.
The revision includes flexible cords and cord sets and flexible cables.
This was needed to clear up a misconception that flexible cords could be used even where flexible cables
could not be used, as in through doorways or through walls. It is still not allowed to run cords above
suspended ceilings with the exception of space designed for the purpose. It is generally not allowed to
run cords through raceways. There are a few exception to the rules for flexible cables found in Art 590
(temporary wiring)

402
CHANGE: 402.3 Fixture wires- Types

A new heat resistant type of wire insulation has been added to the list in Table 402.3 . FFHH-2 was
added with heat rating of 900C . IN. Thermoplastic insulation may stiffen below 140 F and may be
deformed at normal temperatures, at pinch points, etc.

404
CHANGE: 404.7 Switches - Indicating

A requirement for general use switches to indicate whether they are “on” or “off” when accessing the
external control of the switches, has been added for clarity. Three-way and four-way snap switches do
not indicate on or off.

CHANGE: 404 .9 General use snap switches, Dimmers and Control switches
(A) Faceplates shall completely cover the opening.
(B) Grounding of switches, control switches and dimmers to the equipment grounding conductor will
provide a means to also ground a metal faceplate even if the faceplate is not metal. See exceptions 1-3

404

CHANGE: 404.14 Rating and Use of switches
Switches shall be listed- and used within their ratings. Switches is (A) –(F) shall be limited to the control of
specified loads.
(A) (5) AC general-use snap switch to control: Electronic ballast, self ballasted lamps, compact fluorescent
lamps and LED lamps and drivers, not exceeding 20 A or the rating of the switch.
(B) (4) AC/DC general-use snap switch with the same loads cannot exceed the rating of the switch.
(D) AC general-use snap switch rated for 347 V. (See NEC)
(E) Dimmer and electronic control switches. Dimmer, occ. sensors and timing switches shall be connected to
permanently installed loads… not exceeding their ampere rating
(F) Switches that control Cord and plug connected loads are to be rated at the branch circuit current rating. (see
exception)

404

CHANGE: 404.22 Electronic control switches
The title was changed to electronic control and not “electronic lighting control”. Electronic control switches
shall not introduce current onto the equipment grounding conductor. (This rule was introduced in 2017 and was
to be effective on Jan 1, 2020) See the exception to 404.2 (C) that does allow current on the grounding conductor
if retrofitting on circuits that do not have a neutral conductors per 404.2 (C).

Switch with conduit photo

406

CHANGE: 406.4 (D) (4) Exception Receptacle, cord and plug connectors
General installation requirements for receptacles (outlets)
(D) Replacements of receptacles follow requirements in (1) –(7)
(4) AFCI receptacles or DFCI are required for replacement receptacles in areas that require the protection.
The exception in 210.12 (D) does not apply to replacement of existing receptacles, but does apply to
extensions of existing branch circuits. .

NEW: 406.4 (D) (7) Controlled receptacles
If automatically controlled receptacles are no long automatically controlled, then the marked “Controlled”
receptacle is to be replace with a non-controlled receptacle.

Show Controlled symbol

406

NEW: 406.5 (G) Receptacle mounting – Receptacle orientation
(1) Receptacles shall not be mounted in a face up position in countertops or work surfaces – unless listed for these
applications
(2) Under sinks. Receptacles shall not be installed in a face up position under sinks.

Photo of under cabinet recpt.
NEW- CHANGE 406.9 (C) Receptacles in damp or wet locations. Bathtubs and shower space.
Receptacles shall not be installed within 3 ft. horizontally or 8 ft. vertically from the top of the bathtub rim or the
threshold of the shower including the space above the tub or shower. (See Exception for small bathrooms) If the 3
ft. rule cannot be obtained for small bathrooms, the receptacle shall be in the wall farthest from the bathtub or
shower stall.

Insert photo of bathroom

406

CHANGE: 406.12 Tamper Resistant Receptacles
 (1) Receptacles in dwelling units- attached and detached garages and accessory buildings as well as the
receptacles in 210.52 (Dwelling Locations) and 550.13 (Manufactured housing) are to be Tamper resistant (TR)
(2) Guest rooms and guest suites of hotels, motels and their common areas require TR receptacles
(4) Preschools and education facilities . The wording for elementary education was removed.
(7) Dormitory units and dormitories are included
(8) Assisted Living facilities (This was added 2020)

Photo of tamper resistant recpt.

406

NEW: 406.13 Single pole separable connectors
Single pole connectors are to be listed
(A) Connectors are to be locking or latching type
(B) The grounded conductor connector shall be white- and grounding connectors shall be green in color
(C) The connectors shall be interchangeable for AC or DC provide they are so listed
(D) Connecting and disconnecting- is to be done when the system is de-energized - by following one of 3
provisions in the NEC

Photo of single pole connectors

408
CHANGE: 408.4 (A) Switchgear…Panelboards- Circuit directory

(A) A circuit directory is required for each switchboard… panelboard and shall be located on the face, inside of,
or in an approved location adjacent to the panel.
(B) All panels shall have the source of supply marked on the panel. This is for other than one and two-family
dwellings

NEW: 408.6 Short Circuit Current Ratings (SCCR)
Switchboard, switchgear and panelboards Will have an SCCR at or above the available fault current at the panel.
In other than one and two family dwellings, the fault current value and the date it was determined shall be
posted on the panel.

Art work Warning label with infor.

408

NEW: 408.8 Reconditioning of Switchboards, Switchgear and panelboards
Follow part (A) and (B) for reconditioning equipment . If the equipment has been damaged by fire, combustion
products, or water, the equipment will be re-evaluated by manufacturer or NRTL before re-use
(A) Panelboards are not to be reconditioned. The guts may be replaced within an enclosure. They may need to
be reevaluated
(B) Switchboards and switchgear (Add definitions) if reconditioned shall be marked “reconditioned” and
previous labels and listing shall be removed .
Equipment that stays within the facility and is repaired or has parts replaced is not considered reconditioned.
NEW: 408.18 (C) Clearances
Marking on the front of the switchboards and switchgear is required if side or rear access is required for field
connections.
See new parts (1) – (3)

408

CHANGE: 408.36 Overcurrent protection in panelboards

Exception 1 was deleted because the exception allowed up to six disconnects in one panelboard, if it was being
used as a Service. This is no longer allowed with six disconnects in the same enclosure, so the exception was
removed

NEW: 408.43 Panelboard orientation
Panelboards are not permitted to be installed in a face-up position. This practice was allowed in some
circumstances where equipment islands were created and a panel board to serve that island was installed in a
horizontal face- up position. A face down horizontal mounting is still allowed.

410

CHANGE: 410.2 Definitions were applied to this section of the code.
Re-name definition to ”clothes” closet

CHANGE: 410.16 Luminaires in Clothes closets
This wording change was to refocus the closet storage rules to be centered on the “clothes” closet and not on
other types of storage closets (linen). More information is needed for other types of storage.

CHANGE: 410.36 Means of support for luminaires
(A) Luminaires are permitted to be supported by the outlet boxes OR fittings. (As in receptacles designed for
hanging fans or lighting).

Artwork of ceiling recpt.

410

DELETED: 410.44 exception 1: Methods of grounding luminaires
Exception 1 was deleted. If there is no conducting material exposed on a luminaire, then it is not required to
be grounded. The exception stipulating that - was not needed.

NEW: 410.69 Identification of Control Conductor Insulation
Where there are control conductors in the same luminaire as the power conductors, The filed connected
control conductors will be of a different color than the grounded branch circuit conductors. Effective
1/1/2022. See exception to allow a gray control conductor to be used if it remarked. Typical connections for
controlling LED lighting dimmers.

NEW: 410.70 Combustible shads and enclosures Add Cloud light photo
Airspace shall be provided between the shades or other combustible enclosures, and the lamps .

410

CHANGE: 410.116 (C) Luminaire installation in Fire resistant construction
Luminaries that are marked “ For use in NON Fire rated construction” shall not be used in fire rated
construction. See conditions (1) – (3) if a luminaire is recessed in a fire resistant construction.

NEW: 410.118 Access to other boxes
Luminaires recessed into a ceilings floors or walls, are not permitted to provide access to boxes behind the
luminaire. This does not include lay-in ceilings

Artwork for access to boxes.

410
NEW: Part XVI of Art 410. Horticultural lighting.

All NEW: 410.70- 188
Indoor growing facilities are expanding throughout the country. As such, many of the installations are
subject to manufacturers instructions. Some of the lighting must be identified for the purpose and some
must be listed.

Example of horticultural lighting

422

CHANGE: 422.5 (A) GFCI protection for appliances
(A) General requirements are that a class A - GFCI is required for circuits 150 V. or less to ground, and
60A or less, either single or three phase. See Listing of appliances in (A) (1)- (7) which now includes
sump pumps and dishwashers and bottle fill stations along with drinking water coolers at this NEC
location.
(B) Lists the type of GFCI and the location of installation requirements. They are required to be listed
and readily accessible. They can be in locations in (1) – (5).

Photo of appliances with GFCI

422
 CHANGE: 422.16 Flexible cords for appliances

 Flexible cords are permitted as in parts (1)- (2)
 1) To connect appliances so that noise and vibrations are not transmitted to the electrical system
 2) To allow fastened in place appliance to be removed for maintenance and repair and the appliance is
 identified for flexible cord connection.

 CHANGE: (B) Wastes disposers- in sink - can be connected with cord and plug, where conditions are
 met such as 3) The receptacle shall be accessible and 4) The cord and plug must contain an equipment
 grounding conductor and the receptacle is a grounding type and GFCI protected
 (B) (2) Added that the flexible cord connected to dishwashers and trash compactors to have the
 receptacle in a section of the cabinets adjacent to the appliances. When passing through a partition,
 the hole is to be bushed with a grommet. The cord and plug are to provide equipment grounding.

422

CHANGE: 422.16 (B) (4) Range hoods and Microwave Oven / combination
The over the range hoods and microwave oven combinations are permitted to be cord connected with the
additional requirements that the receptacle be accessible, and the cord has equipment grounding provisions.
The receptacle must be a dedicated circuit. Exception: If the appliance is marked to provide double
insulation, then no grounding is required.

NEW: 422.22 Utilizing separable connectors
Appliance are permitted to use listed locking support and mounting receptacles, along with mating
attachment fittings used in their intended applications.

Artwork for attachment fittings

424

 CHANGE: 424.1 Scope for Fixed Electric space heating Equipment.
 The scope of this article has been amended to include heating cables, central heating systems. It does
 not include process heating and room air conditioning.

 NEW: 424.20 (A) Thermostatically controlled switching devices serving as both controller and
 disconnecting means for electrical fixed electric space heating equipment
 There are now 5 conditions for this provision. See items (1) –(5) means that they are to br in
 accessible locations.

 Photo of thermostat in baseboard heater

425
CHANGE: 425.22 (A) 120 A

Fixed resistance heating elements are now permitted to be grouped into circuits not exceeding 120A
and protected by OCP at 150A under specific conditions. Satisfy one of the conditions in (1) – (3).
Previously the subdivided loads could be 48 A groupings, and protected by 60A OCP without these
provisions.

430
NEW: 430.2 Definitions of electronically protected motors

The type of motor protection that is integral part of the motor that has electronic protection and is
marked on the nameplate as “EP” . These EP motors are self protecting and do not require further
protection from overloads or failure to start.

Example of electronic protection

430

NEW: 430.122 (B) ASD - output conductors
Input conductors to the power conversion equipment of ASDs are required to be 125% of the rated
input current to the ASD. The output from the ASD – or the supply the conductors to the motor – are
required to be at least 125% of the nameplate current of the motor.

NEW: 430.122 (D) ASD- Several motors and other loads
The feeders that supply several motors with ASD and other loads are to be based as in 430.24, but use
the input current of the power conversion equipment as the supply current. This clarifies that the input
current is used for the feeder calculation rather than current from the motor.

440

CHANGE: 440.9 AC and Refrigeration equipment- Grounding and bonding
Where HVAC or refrigeration equipment is located outdoors and on a roof, an EGC –wire type- shall be
installed in metal conduit that uses compression fittings. Using compression fitting does not create a
tight enough bonding connection and a wire needs to be installed in the raceway.

 Photo of compression fitting on metal conduit
CHANGE: 440.32 AC and refrigeration equipment – branch circuit conductors single
motor compressor
Use 125% of either the moto/compressor rated load current or 125% of the branch circuit selection
current, whichever is greater to size the branch circuit conductors. Do not use 125% of the “minimum
supply circuit ampacity” which already has been calculated at 125% of the loads.

445

NEW: 445.6 Generators- Listing
Stationary generators, 600V or less, must be listed. The exception is that custom made generators can be
approved through Field Evaluation Bodies (FEB)
NEW: 445 .18 (D) Generator- Disconnection means and Emergency Shutdown shall have a
provision to shut down the prime mover.
Other than cord and plug connected generators, will have a disconnecting means. Generators shall have a
means to shut down the prime mover. The means of shut down shall be a means to disable all prime mover
start control so it cannot start and it will initiate a mechanical shut down that requires a reset.
NEW: 445.18 (C) Emergency shutdown Generators more that 15kW shall be provided with an
emergency shutdown/ stop switch.
NEW: 445.18 (D) One and two family emergency shutdown
Emergency shutdown controls shall be in an readily accessible location.
Art work for generators

450
CHANGE: 450.9 Transformer ventilation
To provide adequate ventilation for transformer Air must be able to move around the transformer and the
stipulation that the transformer top horizontal surfaces that are accessbile shall be marked to prohibit storage
and allow the heat to escape.

Photo of Transformer top storage

480

NEW: 480.7 Storage batteries- DC Disconnect Methods
(B) For one and two family dwellings a n Emergency disconnect or control is to bne readily located outside
the building for disconnecting the battery system

NEW: (C) Batteries having series connections.
Batteries over 240V DC shall have a disconnecting means that separates the batteries into segments that are
not over 240V . Non-load break bolted or plug-in disconnects are permitted.
CHANGE: (F) The disconnecting means shall be marked and include the nominal battery voltage and the
available fault current derived from the batteries. This marking shall also have an ARC –FLASH warning label
NEW: (G) Identification of Power Sources.
Plaques need to indicate how the battery systems are connected into or as part of the electrical systems.

490

NEW: 490.21 (A) (5) Over 1000V equipment circuit interrupting Devices- Retrofit trip
units

A retrofit trip unit shall be listed for use with specific circuit breaker with which it is installed.

Example of retrofit trip unit

Chapter 5
Special Occupancies

500

NEW: 500.7 Protection techniques (K) Combustible gas detection system
A combustible gas detection system is permitted to be used in industrial establishments with restricted
public access and only qualified persons are servicing the equipment.
(K) (1) The gas detection system shall meet all the requirements of parts 1-7 of this article. See NEC for
1-7 requirements
(K) (2) If a location is determined to be class 1 div 1 because of inadequate ventilation, are permitted
to use gas detection systems in that location and use wiring practices as a Class 1 div 2 classification.
There must be an alarm if the gas alarm exceeds 40%....
(K) (3) If a space does not contain a source of flammable gas, and is in, or opens to, a Class 1 Div. 2
space that has a hazardous gas detection system, can be an unclassified location if all of the conditions
1-4 are met.

500
NEW: 500.7 (L),(M) (N) (O) . Optical radiation and Skin effect- trace heating

These new provisions were added to protect hazardous locations form newer methods that are used that
cause heating of surfaces. This in turn may cause gases or vapors to be heated to a point that cause an
explosion. Item (O) is for heating of pipe or pipelines with electric traces. These new provisions will provide
allowances for the proper rating of the environments

501
CHANGE: 501.10 Wiring methods

(A) (1) Class 1 Div. 1 locations: Major revisions to the wiring methods permitted in Class 1 Div. 1 locations. Use
RMC or IMC conduit. Type MI cable, MC-HL ( Hazardous location) listed for the location, ITC-HL Instrumentation
Tray Cable listed for the environment, several types of optical fiber cable, type TC-ER_HL Tray Cable- Exposed
Run- Hazardous Location and Type P cable are permitted.
(A) (2) Changes that now include type P cable for flexible connections.

(B) Class 1 Div. 2 locations

505

CHANGE: 505.3 Zone 0,1,2 locations
Where Class 1 is used in the zone classification system, it shall apply to Zone 0,1,2 designations

505.4 Documentation
Documentation that designates hazardous locations is to be available to persons who design, install, inspect or
operate the electrical equipment contained therein. See all the informational notes in this section.

CHANGE: Table 505.9 (C) (2) (4) Equipment suitability
Change in name of the table from “types of protection designation” to “Equipment Suitability” The table was
expanded in content to include more marking standards and organized into zones or permitted protection.

511
CHANGE: 511.12 Commercial Garages, Repair and Storage - GFCI protection

Class A - GFCI protection shall be provided as required in 210.8 (B) – Other than Dwelling units. This changes
from previous where receptacle for electric diagnostic equipment, hand tools, etc. were required to be GFCI
protected

Artwork for commercial garages.

513

CHANGE: 513.3 (D) Areas suitably cutoff and ventilated.
Areas where flammable liquids or factors are NOT likely to be released, can be “unclassified” if
mechanically ventilated at the rate of 4 air changes per hour, or with positive air pressure , or if the areas
are effectively cutoff from the rest of the hangar.

Air Craft hanger partitions

514

CHANGE: 514.11 (A) Emergency Electrical Disconnects.
The emergency disconnect that opens all the conductors to the gas pumps including the control and signal circuits
and including the grounded conductor but NOT the grounding conductor

Picture of gas pump installation and emergency shut off

517
Change: 517.1 Scope- Health care facilities.

This article applies to the construction and installation of electrical systems in facilities that provide health
care to humans. This code article along with NFPA 99 are used to guide the electrical installations.

CHANGE: 517.2 – definitions pertinent to Art 517.
See: Dental office, Health Care Facility’s Governing Body, Medical office, Patient Care space: Category 1, 2,
or 3
CHANGE: 517.10 (B) Not covered by Part II
(3) Areas used exclusively for: a. Immunizations, b. Psychiatry or psychotherapy, c, Alternative medicine, d.
Optometry

517
CHANGE: 517.16 Use of isolated ground receptacles
If used, the isolated ground receptacles, are not to defeat the purpose of the safety feature provided by
grounding systems as specified in 517.13 (redundant grounds) You still need two grounds to the box as
in: metal conduit and a grounding wire.
(A) No isolated ground receptacle s are installed in Patient care vicinity
(B) If outside a patient care vicinity, an insulated equipment grounding conductor (Green with a yellow
stripe for isolated ground) is installed to the receptacle grounding terminal. The equipment that is not
connected to the grounding terminal of the receptacle is green with no yellow stripe.
CHANGE: 517.17 (D) GFPE testing of equipment
The testing required for proper GFPE protection is to be accomplished by a qualified person using
qualified equipment. A record of the test results is to be maintained.

517
NEW: 517.18 (B) Category 2- Patient bed location receptacles

(B) (1) Each patient bed location will have a minimum of 8 receptacles. The format was changed from 2017 NEC to
be more descriptive in part (A) and listing in part (B).
(B) (2) Receptacle requirements are reiterated in part (2)
517 Part III. Essential Electrical systems.
Many changes and updates to the essential electrical systems were made to help coordinate it with the
requirements of NFPA 99 so that the understanding of multiple crafts can be better communicated.
CHANGE: 517.26 The life safety branch shall meet the requirements of Art 700 except for 4 items.
NEW 517.30 (B) Includes new information on Fuel cells and battery systems for power sources.
NEW 517.30 (C) New information on Services and feeders. See NEC for exact information

517

CHANGE: 517.31 (C) (1) Wiring requirements for essential electrical systems
Parts (a) –(e) are organized to separate and identify the life safety and the critical branch of the essential
electrical systems from other wiring.

Add layout of Essential system

518
NEW: 518.6 Assembly Occupancies – Illumination

Illumination shall be provided for all electrical gear that is outdoors and serves assembly occupancies. It
cannot be controlled by automatic means only. If the space is illuminated by other adjacent lighting, no further
lights will be required.

Photo of space outside of auditorium

520

CHANGE: 520.25 (B) Dimmers for Theaters
Reactor style dimmers and solid state dimmers are used for theater dimmers. Resistor and reactor type
dimmers have not been installed for over 50 years.

NEW: 520.68 (A) (2) Cords for theater equipment
Listed hard usage cords (junior hard service) are permitted with portable stage equipment. The cords must be
protected from damage by attachment to substantial support structure or in areas that protect them from
damage. The cords of cables must be protected at not over 20A

525

CHANGE: 525.20 (G) wiring methods for carnivals and circuses
The mating that protects cords on the ground or floor are to be secured in place. This protection can
also be of other approved methods if this other method does not increase tripping hazards

Photo of cord guard

545
NEW: Article 545 manufactured buildings Part II including mobile dressing rooms, offices,
etc
Relocatable structures are now part of the manufactured buildings. Relocatable buildings are moveable
structures such as non dwelling structures that are used for temporary conditions. Mobile classrooms,
temporary dressing rooms, construction offices etc. that do not require foundations. They are factory
assembled in one or more units and then transported to the locations for use.
545.22 Power Supply (A) The supply to the units are considered feeders
If there are two structures used to form a single unit, then a feeder may supply each part

NEW: See NEC for parts 454.22- 545.28

547

CHANGE: 547.5 (G) GFCI protection in agricultural buildings
GFCI is required as in 210.8 (B) for other than dwelling unit buildings. However, only 15A-20A receptacles not
over 125V require GFCI protection in areas that have equipotential planes, outdoors, damp and wet locations,
and dirt confinement areas.

CHANGE: 547.9 Electrical distribution points
Livestock building on the same premises shall be supplied by a distribution point. The distribution point is the
supply to various buildings by a 4-wire grounded distribution system. This is to reduce the likelihood of
currents through the ground causing stray voltages . Overcurrent protection is required for all underground
branch circuits and feeders

550

CHANGE: 550.13 (B) GFCI required for mobile home and manufactured homes
Receptacles in mobile home and manufactured homes are required to follow the stipulations of 210.8 (A) for
dwellings. Receptacles other than 125V 15A-20A are not required to be GFCI for those receptacles inside a
compartment accessible only from the outside, bathrooms, kitchen countertops, receptacles within 6 ft. of the
sink, and for dishwashers.

CHANGE: 550.32 (E) Receptacles for power supply
The supply receptacles (pedestal) for mobile or manufactured homes are not required to be GFCI protected.
(typically 30A or 50A 240V receptacles)

551
NEW: 551.40 (D) Polarity checks for Recreational vehicles
For al RVs there is to be a reverse polarity indicator with a continuous visible or audible signal that the polarity
has been reversed on the grounded and ungrounded conductors . This is to prevent the mistaken connections
from homemade adapter cords used on 30A and 50A changeover.

CHANGE: 551.71(A) RVs and RV parks receptacles
There shall be at least one 20A 125V receptacle at the RV pedestal. It shall be weather resistant but is not
required to be tamper -resistant.

CHANGE: 551.71 (F) Receptacles at RV parks
All 125V 15A-20A receptacles are to be GFCI protected.
Photo of pedestal

555

NEW: 555.2 Definitions to Marinas, Floating Buildings, and docking facilities
Many new definitions regarding the marinas and boatyards as well as floating buildings are in this article.
See NEC for multiple definitions

NEW: 555.3 Electrical Datum Planes
(A) For floating piers the datum plane shall be 30 inches above the water level and at least 12inches above the
deck.
(B) Areas that are subject to tidal variations, the datum plane is 2 ft, above the highest tide level in the area at
high tide and normal circumstances
(C) Area not subject to tide (including the Great Lakes ) the datum plane is 2 ft above the highest water level in
the area under normal circumstances

555
CHANGE: 555.4 Location of Service Equipment
The service equipment for a floating building, dock, or marina is to be on adjacent land to he structure, but not on
the structure

NEW: 555.9 Boat Hoists
GFCI for boat Hoists was moved here. Class A GFCI is to be provided for outlets not exceeding 240V at dwelling unit
dock facilities.

NEW: 555.13 Bonding of non-current carrying parts at Marinas, Boatyards, etc.
All metal parts that are in contact with the water and likely to become energized, are required to be bonded to the
grounding bus in the panelboard. The bonding is to be not smaller than #8 copper

555
NEW: Part II of Article 555- Marinas, Boatyards and Docking Facilities

NEW: 555.30 Electrical connections
(A) Floating Piers are to have electrical connections at least 12 inches above the deck. Wet location wiring
required and sealed wire connections are listed and identified for submersion, where located above the
water line- but below the datum plane
(B) For Fixed piers, the connections shall be at least 12 inched above the deck, and not below the datum
plane
(C) Replacements follow the rules as above

555

 NEW: 555.35 GFPE and GFCI Protection
 (A) (1) Receptacles providing shore power shall have GFPE set not more than 30 mA.
 (2) All 125V 15A-20A receptacles for other than shore power to have class A GFCI.
 (3) Feeder and branch circuit conductors to have GFPE at 100mA and can be coordinated with downstream
 devices
 (B) Leakage current measurement
 Where there are more than 3 receptacles providing shore power to boats, a current leakage monitor will
 measure leakage current from each boat. See Informational Notes in NEC
 NEW: 555 part III for floating buildings added.
 The feeder that supplies floating buildings to have GFPE set at 100mA or branch circuit GFCI is also
 permissible.

590

NEW: 590. 4 (G) Temporary Installations – splices Exception 2
Generally every splice is to have a box or other enclosure and covers. The exception allows splices in junction
boxes that are permanently installed in framed walls or ceilings, and supply GFCI protected power or lighting
then 3 conditions are permitted. 1) no cover is needed if splices are inside the box 2) Listed pigtail lampholders
are permitted for ceiling mount fixtures 3) finger safe devices are permitted for supplying and connecting
devices.

NEW: 590.8 Overcurrent for temporary installations
(A) If OCP is reused from previous applications, the OCP shall be examined for safety and effectiveness.
(B) Service OCP for services over 150V to ground and not exceeding 1,000V phase to phase will be current
limiting.