pdf Conference 2010 Submissions Draft

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2010 Annual Technical Conference

Agenda item # 2010ag-01 2-000 Authority for rules

Submitted by: Don Bradshaw – City of Airdrie

Question/enquiry: How can we put some “authority” in “the authority having jurisdiction” when

it comes to unqualified workers doing electrical work.

Recommendation:

Alberta Apprenticeship and Industry Training needs to review their enforcement standards and accept testimony of an Electrical SCO as evidence of misconduct
Electrical SCO’s need a method to take action against unqualified workers doing electrical work.

Background information:

In 2009 in Airdrie, we had 2 striking examples of non-qualified electrical workers and both were absolutely dismal installations. For a strip mall bay developed into a restaurant, two formal complaints were launched.

against the Master Electrician (who had pulled a permit with full knowledge a non- qualified worker was going to do the work) with the Electrical Contractors Association under the new Certified Master Electrician program.
against both the electrical and general contractor (who happens to be in the refrigeration trade) with Apprenticeship and Industry Training, responsible for enforcing legislation covering who is allowed to conduct work in the trades.

Neither of these complaints resulted in any charges. Here is what happened, but first here is some background on the legislation:

The Certification and Permit Regulation (now known as the Permit Regulation), which is under the umbrella of the SCA , covers workers in the “compulsory certification trades” of electrical, plumbing and gas, but the portion that deals with who can do what work in these trades was relocated in about 2007 to the Apprenticeship and Industry Training Act. What only remains in this regulation relating to certified trades is who is allowed to pull permits. The Apprenticeship and Industry Training Act, administered by Alberta Learning, sets the framework legislation establishing who can conduct work in a trade or occupation.

The first complaint against the Master Electrician was looked at but could not be acted on by the Electrical Contractors Association, as this contractor was not signed up under the new system (Certified Master Electrician) in place for dealing with this kind of misconduct. As such they forwarded the complaint to Alberta Municipal Affairs. AMA took a serious look into it but could not find anything under the Safety Codes Act that was violated. AMA did indicate if there was one line in the permit conditions that said something about using only qualified people to do the work that couold have been something to work with.

The second complaint – based on the Apprenticeship and Industry Training Act violation being handled by Apprenticeship did not go much better. Information back from both the Calgary Trades Consultant and from information given back to me from AMA indicates the Trades Consultant must firsthand witness the violation; the witnessing of the event by an ESCO is not good enough. The Calgary Trades Consultant was to talk to their legal council to see, if in this case, an ESCO firsthand witnessing the violation is enough to proceed with the complaint, but did not get past the office supervisor with this course of action. The Trades Consultant told me the issue was handled but due to FOIP, no details could be revealed. Normally on a first offence warnings are issued.

Potential solutions:

When issuing permits, put in permit conditions that state qualified people are required to do the work. This may be sufficient to pursue charges under the SCA. Permit Regulation Section 22 (terms and conditions) which allows us to “set the qualifications of the persons responsible for the undertaking”. Airdrie now attaches a line under permit conditions for every E, P & G permit we issue which reads - “Persons carrying out work associated with this permit must be qualified and hold an appropriate certificate as outlined in the Apprenticeship and Industry Training Act”

2010 Annual Technical Conference

Agenda item # 2010ag-0 6-206 (d) consumers service equipment location

Submitted by: Milt Sorensen – Alberta Municipal Affairs

(also suggested for further discussion by John Biollo – Biollo Agency)

Question/enquiry: Is this rule being largely ignored by the inspection industry?

During recent inspections, after being out of field inspections for 14 years, it has become obvious that this rule is being largely ignored by inspectors. A number of new residential installations have been found with the service disconnect located on the exterior of the home, thereby allowing an unlimited length of service conductors into the building.

Recommendation: Enforce the rule as written. Limit the use of exterior service disconnects to those installations that warrant them. Poor planning on the part of the electrical contractor does not justify this type of installation.

Background research summary:

This item has been previously discussed – see background information for details.
Code article 6-206 has not changed in 2009 CE Code
“within the building being served” is highly subjective – not the term – it means inside. What is controversial is what is considered part of the building. What about inside an attached garage?
Why it is required inside appears to be linked to the Building Code NBC 9.34 to minimize interference with the equipment. Adequate precautions to prevent interference with the equipment mean lockable.

Background information:

Appendix G note for this rule references NBC 9.34 – Electrical Facilities.

9.34.1.3 Location of Equipment in public areas. Entrance switches, meters, panel boxes, splitter boxes, time clocks and other similar equipment shall not be located in any public area unless adequate precautions are taken to prevent interference with the equipment

Information as recorded from 2008 Conference Agenda item # 2008ag-05

CEC 6-206 residential service disconnect outside

Question/enquiry: Rule 6-206 States that the service equipment be placed within the building being served unless environmental conditions within the building are unsuitable. Sometimes it is very difficult to keep the service conductors as short as practical within the house to comply with Standata 6-206. Or the premises is developed making it awkward or very difficult to comply this requirement. Placing the service entrance equipment on the exterior may ultimately be safer as it eliminates un-fused conductors inside the residence. There are combination service entrance devices available that are CSA approved marked for service entrance. Because of Rule 6-206, this equipment is restricted in use.

2008 Conference conclusion:

As of today, special permission is required. In Alberta this means a variance must be written and filed with the administrator to do this type of installation.
Lots of variability on how these types of installation are allowed or not allowed in Alberta and other Provinces. Very few are getting the required variance in Alberta but some are asking for a letter from the contractor.
When asked for a vote to leave the rule as it or to make changes to it a show of hands indicated that there is support to leave the rule as is. Additional discussion occurred after the vote particularly on special permission (a variance) is required every time you accept this type of installation. Vote was already taken so item can be resubmitted next year.
Item closed (but brought to AEICTC for information)

AEICTC June 2008: There was a consensus to make a submission to CSA Part 1 for a rule change as well as having the administrator issue a province wide variance.

Note: We do know this subject has been discussed at Part 1, but little support to change the code rule.

Under current code, SCO’s are obligated to send in a variance for each service installed with service equipment outside

2010 Annual Technical Conference

Agenda item # 2010ag-0 6-208 Consumer Service Conductor Location

Question/enquiry: Electrical contractors contend that it is commonly accepted practice to allow the service conduit to be run inside a residential basement slab without being encircled by 2” of concrete as required by 6-208.

Sub-rule (2) recognizes service conductors must enter the building for connection, but is this a relaxation for sub-rule (1) methods?

STANDATA produced for length of conductors inside the building is silent on in slab or below slab sections.

Recommendation: To not accept a service conduit sitting on top of the granular layer in a residential basement slab.

The slab is required to be 3” (75mm) thick by ABC 9.16.4.3 – if the slab is installed to meet Building Code minimum (lots are not). Even with proper slab thickness, the concrete coverage on top of a conduit sitting on top of the granular layer could be less than 1 inch thick – particularly when the conduit rides over top of plumbing pipes or footing pads.

Background information:

6-208 Consumer's service conductors location

(1) Raceways or cables containing consumer's service conductors shall be located outside buildings unless they are

(a) embedded in and encircled by not less than 50 mm of concrete or masonry where permitted by Section 12;
(b) directly buried in accordance with Rule 6-300 and located beneath a concrete slab not less than 50 mm thick; or

(2) Notwithstanding Subrule (1), raceways or cables containing consumer's service conductors shall be permitted to enter the building for connection to a service box.

2010 Annual Technical Conference

Agenda item # 2010ag-0 12-506 - method of installation NMSC

Submitted by: Electrical Contractors Asssociation – Rik’s Electrical

Question/enquiry: NMD90 touching heating vents – some inspectors allow and others do not.

Recommendation: Requesting consistency from inspectors.

Background research summary:

Air space or insulation between heat duct and NMD90 runs is required

by CE Code 12-506

Background information:

12-506 Method of installation (see Appendices B and G)

(4) Where non-metallic-sheathed cable is run in proximity to heating sources, transfer of heat to the cable shall be minimized by means of an air space of at least

(a) 25 mm between the conductor and heating ducts and piping;
(b) 50 mm between the conductor and masonry or concrete chimneys; or
(c) 150 mm between the conductor and chimney and flue cleanouts.

(5) Notwithstanding Subrule (4), a thermal barrier conforming to the requirements of the National Building Code of Canada or local building legislation shall be permitted to be installed between the conductor and heating sources to maintain ambient temperature of the conductor at not more than 30 °C.

The temperature ratings of non-metallic-sheathed cable vary from 60 to 90 °C. This cable is required to be installed in locations with an ambient temperature not exceeding 30 °C. When the cable is installed adjacent to heat sources (e.g., near heating pipes or ducts, masonry or concrete chimneys, and chimney and flue cleanouts), clearances must be provided for the different heating sources depending on the intensity of the heat source.

Figure 12-13
Typical installation of non-metallic-sheathed cable close to hot duct

Figure 12-14
Typical installation of non-metallic-sheathed cable close to chimneys and cleanouts

2010 Annual Technical Conference

Agenda item # 2010ag-0 14-606 and Section 50 panelboard overcurrent

Submitted by: Larry Cantello - NAIT

Question/enquiry. Are there any size limits/maximum ampacity for a breaker feeding a residential panelboard from a Solar Photo Voltaic system? There are currently no rules to address maximum combined “supply side” breakers feeding a panelboard from micro-generation sources.

Recommendation: Produce a STANDATA until this issue is addressed by Section 50 - See attached proposed STANDATA item and drawing.

Background research summary:

There is a rule that limits the input to a panelboard or its busbar. CE Code Rule 14-606 indicates the panelboard shall be protected on the supply side by over-current devices having a rating not greater than that of the panelboard. Do we consider the solar input a “supply side” feed to the panelboard? Does this rule impose limits to the point that there is little or no room for any solar PV input? This rule does not address the ability to go above the panel rating with total inputs when solar PV installations also feed the panel. If Solar PV input is not considered supply side – is there no limit to how much could be installed?
CE Code could parallel what is allowed in the NEC which is not to limit the total feeds to the rating of the bus (or conductor). The NEC provides for an allowance to “overload” the panelboard bus to an additional 20% above its rating. NEC 690.64 allows breaker inputs to the bus (includes the main breaker and all solar PV input breakers) to total up to 120% of the bus bar rating for solar PV installations in commercial or residential applications. NEC 2008 was updated to allow this practice in a commercial application as well as in a residential application with NEC 690(b)(7) adding an additional requirement for the backfed overcurrent device to be located at the opposite end of the panelboard from the main breaker or feeder connection for commercial installations.
As well – this scenario applies to all types of micro power generation including wind or other new technology power sources.

Background information:

SECTION 50 IS SILENT ON THIS ISSUE

14-606 Panelboard overcurrent protection

(1) Except for panelboards where more than 90% of the overcurrent devices supply feeders or motor branch circuits, every panelboard shall be protected on the supply side by overcurrent devices having a rating not greater than that of the panelboard.
(2) The overcurrent protection required by Subrule (1) shall be permitted to be in the primary of a transformer supplying the panelboard, provided that the panelboard rating in amperes is not less than the overcurrent rating in amperes multiplied by the ratio of the primary to the secondary voltage

2010 Annual Technical Conference

Agenda item # 2010ag-0 18-072 Secondary Seals

Submitted by: Stan Misyk – The Inspections Group

Question/enquiry: When a flammable fluid is under pressure or not under pressure, secondary seals appear to be required. If there is no pressure imposed on the device are secondary seals required?

Recommendation: For information and discussion

Background information:

18-072 Flammable fluid seals (see Appendix B)

(1) Electrical equipment with a primary seal in contact with flammable fluids shall

(a) be constructed or installed so as to prevent migration of flammable fluid through the wiring system; and
(b) be used at pressures lower than the marked maximum working pressure (MWP).

(2) Where Subrule (1) is met through the installation of secondary seals, the possibility of primary seal failure shall be indicated by

(a) design features that will make the occurrence of a primary seal failure obvious; or
(b) acceptable marking means indicating that the enclosure may contain flammable fluid under pressure

2010 Annual Technical Conference

Agenda item # 2010ag-0 26-712(g)

Submitted by: EIAA Calgary Chapter

Question/enquiry: Tamper proof receptacles.

Getting lots of questions over how Tamper Resistant receptacles are to be applied in residential construction. Main questions surround do we need to install them in locations that are not inside the dwelling unit – such as a detached garage, attached garage and outside locations including those that are attached to the house.

Part 2 of this question - If a residential building contains dwelling units, how far into the installation are TR receptacles required, such as in hallways of apartments or motels with suites containing cooking facilities?

Recommendation: For discussion and (hopefully) agreement on application in all residential developments in Alberta.

Background research summary:

Because this rule exists in 26-712 Receptacles for dwelling units, which also states "(including singled dwellings) in the stem I would apply Tamper- Resistant Receptacles in all areas mandated by 26-712 and 26-714.

Background information:

26-712 Receptacles for dwelling units (see Appendices B and G)

This Rule applies to receptacles for dwelling units (including single dwellings) as follows:

(g) except as provided for in Item (h), all receptacles of CSA Configuration 5-15R and 5-20R shall be tamper-resistant receptacles and shall be so marked; and
(h) receptacles dedicated for microwaves, refrigerators, freezers, or kitchen counters or those receptacles located in an attic or crawl space shall not be required to be tamper resistant.

26-714 Receptacles for single dwellings

This Rule applies to receptacles for single dwellings only as follows:

(a) for each single dwelling, at least one duplex receptacle shall be installed outdoors so as to be readily accessible from ground or grade level for the use of appliances that need to be used outdoors; and
(b) at least one duplex receptacle shall be provided for each car space in a garage or carport of a single dwelling.

Dwelling unit CE Code definition section 0

“One or more rooms for the use of one or more persons as a housekeeping unit with cooking, eating, living, and sleeping facilities”.

Single dwelling

— a dwelling unit consisting of a detached house, one unit of row housing, or one unit of a semi-detached, duplex, triplex, or quadruplex house.

From Alberta Electrical Group 1 SCO training material:

Affected – All 5-15R and all 5-20R receptacles being installed in dwelling units (including single dwellings)…. Note attached - “this change applies only to those receptacles in dwelling units”.

Saskatchewan interpretations:

26-712 Tamper Resistant Receptacles for Dwelling Units

(g) Except as provided for in Item (h) all receptacles of CSA Configuration 5-15R and 5-20R shall be tamper resistant receptacles and shall be so marked. This does not include the receptacles in a detached garage.

(h) Receptacles dedicated for microwaves, refrigerators, freezers, kitchen counters or those located in an attic or crawl space shall not be required to be tamper resistant.

Kitchen counter receptacles mounted on the sides of cabinets (such as 26- 710(d) for persons with disabilities) shall be tamper resistant.

ALTERATIONS FOR THE NORTHWEST TERRITORIES TO THE CODE

2. ITEM 26-712(B) is repealed and the following is substituted:
(h) the following receptacles are not required to be tamper resistant:

(i) receptacles near kitchen counters;
(ii) receptacles dedicated for microwaves, refrigerators, freezers, washing machines or other stationary appliances where the receptacle is inaccessible for use with general purpose portable appliances;
(iii) receptacles protected by Class A ground fault circuit interrupter;
(iv) receptacles located in attics or crawl spaces; and
(v) receptacles situated more than 2m from the floor line of any wall.

2010 Annual Technical Conference

Agenda item # 2010ag-0 CE Code 26-750 - 26-758

Submitted by: Clare Falk – C&J Electric

Question/enquiry: Does an electric water heater for a steam shower require

GFCI protection in all cases?

Recommendation: For discussion

Background research summary:

CE Code appears to treat steamers as an electric water heater and would fall under electric heating and cooking appliances (26-740 to 26-758) series of rules.
CE Code does not contain a rule requiring GFCI protection for water heaters unless it is a bare element water heater (26-758)
GFCI protection is mandatory if the protection is required by the manufacturer (typically a requirement of the certification/listing). If not installed as per the manufacturer’s installations instructions (the terms of the approval agreement) the installation may be rejected under CE Code 2-026.
Be aware some small electric instantaneous water heaters (typically for supplying water to s single wash basin) may have a bare element heating system.

Background information:

2-026 Powers of rejection

Even though approval has previously been granted, the inspection department may reject, at any time, any electrical equipment under any of the following conditions:

(a) the equipment is substandard with respect to the sample on which approval was granted;
(b) the conditions of use indicate that the equipment is not suitable; or
(c) the terms of the approval agreement are not being carried out.

Appendix B note to Rule 2-026

As a condition of approval of certain types of electrical equipment, the manufacturer supplies instructions pertaining to its installation. It is of the utmost importance that the installer closely follow installation instructions supplied by the manufacturer to fulfill the terms of the approval agreement.

8-200 (1) (v) is one of the only rules that does specifically mention steamers – utilized in this rule for service calculations:

- any electric tankless water heaters or electric water heaters for steamers, swimming pools, hot tubs, or spas with a demand factor of 100%

26-758 Bare element water heaters

(1) A water heater with a bare heater element immersed in water shall be

(a) supplied from a grounded system;
(b) permanently connected to a branch circuit that supplies no other equipment; and
(c) protected by a ground fault circuit interrupter of the Class A type.

(2) A water heater with a bare heater element immersed in water shall not be located within 1.5 m of the point of utilization of the heated water.
(3) A water heater with a bare heater element immersed in water shall be bonded to ground in accordance with Section 10.

Bare element water heaters have bare heating elements submersed in the water of a tank; water is heated by the current flowing between the bare elements through the water. If properly installed and grounded, these heaters present no safety hazard. To that end, Subrule (1) requires that bare element water heaters be permanently connected to a separate branch circuit of a grounded system and protected by a Class A GFCI. The bare element must also be installed a minimum of 1.5 m from the heated water outlet, in accordance with Subrule (2). These heaters must be grounded in accordance with the requirements in Section 10 to eliminate the presence of any electrical charge on the water as it drains from the tank.

2010 Annual Technical Conference

Agenda item # 2010ag-0 CE Code 26-750 - 26-758 domestic hot water tanks

Submitted by: EIAA Calgary chapter

Question/enquiry: Is an electric water heater a continuous or non-continuous load when

calculating for branch circuit conductor and overcurrent size?

Recommendation: For discussion

Background research summary:

Electric hot water tanks are becoming increasingly common in new residential construction as builders are trying to avoid the higher cost of direct vent and mechanically vented gas hot water tanks. This was a reaction to changes in the 2006 ABC rule 9.32.3.8 (depressurization) requiring make up air for any mechanical air exhausting device
Hot water tanks would be considered as continuous load if it is a cyclic load and ON more than half of the time (one hr in every 2 hr period) by 8-302.
Tankless (instantaneous) hot water heaters are considered a continuous load by 8-200 (service calculation)
Domestic electric hot water tanks are most common (240v) in these 3 configurations and wire/breaker combinations if considered a non-continuous load:

3000W – 12.5A - #14/15A breaker

4500W – 18.75A - #12/20A breaker

6000W – 25A - #10/30A breaker

Background information:

8-200 (1) (v) only tankless water heaters are considered as continuous

loads for service calculations:

- any electric tankless water heaters or electric water heaters for steamers, swimming pools, hot tubs, or spas with a demand factor of 100%

8-302 Connected loads

(2) A load of a cyclic or intermittent nature shall be classified as continuous unless it meets the requirements of Rule 8-104(3).

8-104 Maximum circuit loading

(1) The ampere rating of a consumer's service, feeder, or branch circuit shall be the ampere rating of the overcurrent device protecting the circuit or the ampacity of the conductors, whichever is less.
(2) The calculated load in a circuit shall not exceed the ampere rating of the circuit.
(3) The calculated load in a consumer's service, feeder, or branch circuit shall be considered a continuous load unless it can be shown that in normal operation it will not persist for

(a) a total of more than 1 h in any two-hour period if the load does not exceed 225 A; or
(b) a total of more than 3 h in any six-hour period if the load exceeds 225 A.

(4) Where a fused switch or circuit breaker is marked for continuous operation at 100% of the ampere rating of its overcurrent devices, the continuous load as determined from the calculated load shall not exceed

(a) 100% of the rating of the circuit where the ampacity of the conductors is based on Column 2, 3, or 4 of Table 2 or 4; or
(b) 85% of the rating of the circuit where the ampacity of the conductors is based on Column 2, 3, or 4 of Table 1 or 3.

(5) Where a fused switch or circuit breaker is marked for continuous operation at 80% of the ampere rating of its overcurrent devices, the continuous load as determined from the calculated load shall not exceed

(a) 80% of the rating of the circuit where the ampacity of the conductors is based on Column 2, 3, or 4 of Table 2 or 4; or
(b) 70% of the rating of the circuit where the ampacity of the conductors is based on Column 2, 3, or 4 of Table 1 or 3.

Agenda item # 2010ag-0 30-906 luminaires for thermal insulation contact

Submitted by: Electrical Contractors Asssociation – Rik’s Electrical

Question/enquiry: Do pot lights need a 6 mil poly vapour barrier when installed in an

insulated ceiling even when they are rated air tight and IC rated?

Recommendation: Requesting consistency from inspectors.

Background research summary:

IC rated fixtures that bear a label stating they air tight and tested to ASTM E283 (such as the orange Washington State label) do not need an additional vapour barrier, provided the fixture is installed as required by the manufacturer to obtain an air tight installation.
ASTM is recognized in other areas dealing with building code issues – for example Hot Tub covers are required to meet ASTM standards (and be marked as such).
The 4 primary methods specified by the luminaire manufacturers to insure an airtight seal of the certified airtight housing to the ceiling are as follows:

A gasket is attached to the bottom of the certified airtight housing prior to the installation of the ceiling.
A gasket is applied between the certified airtight housing and the ceiling opening after the ceiling has been installed
Caulk is applied between the certified airtight housing and the ceiling after the ceiling has been installed. The caulk creates the airtight seal. The installation instructions for achieving the airtight conditions must specify the type of caulk that must be used and how the caulk must be applied.
A certified airtight trim kit is attached to the housing after the ceiling has been installed. The certified airtight trim kit in combination with the luminaire housing makes the manufactured luminaire airtight. Note that a decorative luminaire trim that is not ASTM E283 certified does not make the manufactured luminaire airtight.

Background information:

ENERGY STAR - Qualifying Criteria for Residential Light Fixtures

Note – this is from Natural Resources Canada, not National research Council that published Building Code.

These luminaires are required to meet mandatory Canadian safety standards when sold in Canada. Natural Resources Canada does not have jurisdiction in this matter.

For recessed downlight fixtures to be considered air tight, the housing or certified/listed accessory must have leakage less than 0.056 cubic meter per minute (CMM) (2.0 cubic feet per minute (CFM)) at 75 Pascals (or 1.57 lbs/ft²) when tested in accordance with ASTM E283 and shall be sealed with a gasket or caulk.

For recessed downlight fixtures that are air tight, the following measures must be taken to ensure that fixtures can be properly installed and inspected:

The fixture itself must include a label certifying "air tight", or similar designation, to show air leakage less than 0.056 CMM (2.0 CFM) at 75 Pascals when tested in accordance with ASTM E283. The label must be clearly visible to a building inspector.
Installation instructions must be included listing all components of the assembly that will be necessary to ensure an airtight installation and how the components should be properly installed. For example, depending on the method used to achieve air-tight operation, the instructions should alternatively show how a gasket is to be attached, what type of caulk to use and how it should be applied, or which certified airtight trim kits are designed to be installed with the luminaire housing.

2010 Annual Technical Conference

Agenda item # 2010ag-0 46-108

Submitted by: Don Bradshaw – City of Airdrie

Question/enquiry:

Scenario - Wall mounted exit signs that require both AC and DC (emergency power supply) input and mounted on a single octagon box.

Are we allowed to use the junction box behind the exit sign to have multiple AC and DC conductors within this junction box (feeding through and also supplying the exit sign mounted on the box) and still meet the intent of 46-108?

Recommendation: Only one AC and one DC feed be allowed into the junction box behind the exit sign and not allow the junction box to be used as a feed through to other exit signs.

Background research summary: Conductors between an emergency power supply and exit signs are to be entirely independent except where necessary, such as in exit signs supplied from two sources.

Background information:

46-108 Method of wiring (see Appendices B and G)

(1) Except as permitted by Subrule (3), Rule 46-304(3), and Rule 46-400(2), the following conductors shall be installed in accordance with Subrule (2):

(a) conductors required for operation of life safety systems and installed between an emergency power supply and life safety systems;
(b) conductors between an emergency power supply and exit signs.

(4) Conductors installed in accordance with Subrule (1) shall be kept entirely independent of all other conductors and equipment and shall not enter a luminaire, raceway, box, cabinet, or unit equipment occupied by other conductors except where necessary

(b) in exit signs and emergency lights supplied from two sources.

2010 Annual Technical Conference

Agenda item # 2010ag-0 78-102 Marinas

Submitted by: Ken Hood – Lloydminster Public School Div

Question/enquiry:

Background information:

78-102 Receptacles

(1) Where receptacles are installed on fixed or floating piers, docks, or wharves in fishing harbours or on marine structures, they shall be

(a) 15 A, single or duplex, of the locking or non-locking type conforming to Diagram 1 or 2;
(b) 20 A up to and including 60 A, of the single-locking type, conforming to Diagram 2 or special-purpose pin and sleeve type; or
(c) over 60 A, single, of the special-purpose pin and sleeve type.

(2) Receptacles shall be fabricated from materials resistant to a salt spray and shall be provided with weatherproof enclosures.
(3) 15 A and 20 A, single-phase, 125 V receptacles other than those supplying shore power to boats shall be protected by ground fault circuit interrupters of the Class A type.