Energy

Categories: Energy
Contact: jovan.cheema@csagroup.org
Origin: CSA
Close date: Mar 27, 2017
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1 Scope

1.1 General

This Standard specifies a test method for calculating the energy performance of external power supplies (EPS) across a full range of load conditions. It covers single-voltage and multiple-voltage external ac-dc and ac-ac power supplies.

Note: External power supplies are designed to convert line voltage ac into the low-voltage output (ac or dc) typically

required by laptop computers, cordless and cellular phones, portable stereos, etc. EPS are contained in a separate housing from the product they are powering.

 

1.2 Purpose

 

The test method specified in this Standard is intended to complement the methodology contained in

CSA C381.2 Test method for determining the energy performance of battery-charging systems. This Standard and CSA C381.2 define two classifications of products for the purpose of energy-efficiency testing; products within the scope of CSA C381.2 are not intended to be tested by this Standard. Annex B provides information on determining the appropriate test method (CSA C381.1 or CSA C381.2) for measuring a product’s energy efficiency.

 

1.3 Exclusions

a) Dc-dc voltage conversion equipment, such as dc-dc converters, are not included in this

Standard, except to the extent that such circuitry is found within a power supply.  

 

b)  A medical device as defined in section 1 of the Canadian Medical Devices regulations

 

c) A direct operation, AC-DC external power supply with nameplate output voltage less than 3 volts and nameplate output current greater than or equal to 1,000 milliamps that charges the battery of a product that is fully or primarily motor operated are not covered by this standard.

 

d) Indirect operation non-Class A external power supplies

 

 NOTE:  These products may be covered by C381.2

 

 

 

 

 

1.4 Terminology

In CSA Standards, “shall” is used to express a requirement, i.e., a provision that the user is obliged to

satisfy in order to comply with the standard; “should” is used to express a recommendation or that which

is advised but not required; “may” is used to express an option or that which is permissible within the

limits of the standard; and “can” is used to express possibility or capability. Notes accompanying clauses

do not include requirements or alternative requirements; the purpose of a note accompanying a clause is

to separate from the text explanatory or informative material. Notes to tables and figures are considered

part of the table or figure and may be written as requirements. Annexes are designated normative

(mandatory) or informative (non-mandatory) to define their application.

Categories: Energy
Contact: jovan.cheema@csagroup.org
Origin: CSA
Close date: Mar 27, 2017
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1 Scope

1.1 General

 

This Standard covers the test requirements used to measure battery charger energy consumption for battery chargers intended to be operated from 115 V ac, 60 Hz line voltage connected by plug to wall receptacles or existing dc sources (such as automotive power jacks or USB ports). Uninterruptible power supplies that utilize the standardized National Electrical Manufacturer Association (NEMA) plug, 1-15P or 5-15P, as specified in ANSI/NEMA WD 6-2016 and have an AC output are included in the scope.

 

 

1.2 Purpose

The test method specified in this Standard is intended to complement the methodology contained in CSA C381.1 Energy performance of external ac-dc and ac-ac power supplies. This Standard and CSA C381.1 define two classifications of products for the purpose of energy-performance testing; products within the scope of CSA C381.1 are not intended to be tested by this Standard. Annex B specifies requirements for determining the appropriate test method (CSA C381.1

or CSA C381.2) for measuring a product’s energy performance.

 

1.3 Exclusions

a) A medical device as defined in section 1 of the Canadian Medical Devices regulations

b) Back-up battery chargers

c) DC output UPS

 

1.4 Terminology

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; “may” is used to express an option or that which is permissible within the limits of the standard. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

Categories: Energy
Contact: iris.monner@csagroup.org
Origin:
Close date: Apr 4, 2017
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1 Scope

1.1

This Standard applies to the

a) design;

b) location;

c) construction;

d) operation; and

e) maintenance

of facilities for the liquefaction of natural gas and facilities for the storage, vaporization, transfer, handling, and truck transport of LNG. It also contains requirements for the training of personnel.

1.2

For facilities that load or unload LNG from a marine vessel, this Standard contains requirements for the interconnecting piping between the loading/unloading arm flange and the storage tank(s), and other piping and appurtenances on the pier or jetty itself.

1.3

This Standard applies to all containers for the storage of LNG, including those with insulation systems applying a vacuum.

1.4

This Standard does not apply to frozen ground containers.

1.5

1.5  This standard applies to LNG facilities in the following categories: 

1.5.1 The requirements for small LNG facilities (see the definition of small facility in Clause 3) are given in Annex B (mandatory).

1.5.2 Mobile and portable LNG equipment used on a temporary or permanent basis are covered in Annex B.

1.5.3 Guidelines for LNG vehicle fuelling stations employed for fleet and public LNG vehicle fuel dispensing operations are given in Annex D.  (See the definition of "fuelling station” in Clause D.2 of Annex D.) This Standard includes non-mandatory guidelines for

a) small LNG facilities (see the definition of “small facility” in Clause 3 and see Annex B); and

b) LNG vehicle fuelling stations employed for fleet and public LNG vehicle fuel dispensing operations (see the definition of "fuelling station” in Clause D.2 and see Annex D).

1.6

This Standard does not apply to the following:

a) the transportation of refrigerants by any means;

b) the transportation of LNG by railcar or marine vessel;

c) the transportation of LNG or regasified LNG by pipeline beyond the facility boundary, except as specified in Clause 1.2; and

d) facilities designed to allow the use of LNG as a fuel for railroad locomotives, or marine vessels.

1.7

All references to pressure throughout this Standard refer to gauge pressures unless otherwise specified.

1.8

All pipe sizes refer to nominal pipe sizes (NPS).

1.9

The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.

1.10

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (nonmandatory) to define their application.

Categories: Energy
Contact: lorraine.mccourt@csagroup.org
Origin:
Close date: Apr 7, 2017
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1 Scope

1.1

This Standard applies to newly produced vented gas fireplace heaters (see Clause 3, Definitions), hereinafter referred to as appliance(s), constructed entirely of new, unused parts and materials, and having input ratings up to and including 400,000 Btu/hr (117 228 W):

a) for use with natural gas;

b) for use with propane;

c) direct vent appliances for manufactured home (USA only) or mobile home OEM installation convertible for use with natural gas and propane when provision is made for simple conversion from one gas to the other [see Clause 4.1.4a) and (b)];

d) direct vent appliances for manufactured home (USA only) or mobile home aftermarket installation for use with natural gas only or propane gas only [see Clause 4.1.4b)];

e) direct vent appliances for recreational vehicle installation for use with propane gas only [see Clause 4.1.4c)];

f) direct vent appliances for recreational vehicle installation only convertible for use with natural gas and propane gas when provision is made for the simple conversion from one gas to the other [see Clause 4.1.4c)]; and

g) for direct vent appliances for manufactured home (USA only) or mobile home OEM installation for use with propane gas only [see Clause 4.1.4a)].

The construction of vented gas fireplace heaters and vented gas fireplace heaters with cooling units for use with the above-mentioned gases is covered under Clause 4, Construction.

The performance of vented gas fireplace heaters and vented gas fireplace heaters with cooling units for use with the above-mentioned gases is covered under Clause 5, Performance.

Δ 1.2

All vented gas fireplace heaters shall conform to the applicable requirements in Clauses 4 and 5. In addition, for requirements specific to vented condensing gas fireplace heaters also see2 Clause 6, Vented condensing gas fireplace heaters (construction) and Clause 7, Vented condensing gas fireplace heaters (performance).22

1.2

Annex A, Automatic intermittent pilot ignition systems for field installation, includes provisions for newly produced (optional) automatic intermittent pilot ignition systems (see Clause 3, Definitions), constructed entirely of new, unused parts and materials, to be adapted in the field to an appliance equipped with an existing continuous pilot burner and which has been examined and tested for compliance with this Standard when installed on the appliance.

1.3

If a value for measurement given in this standard is followed by an equivalent value in other units, the first stated value is to be regarded as the specification.

1.4

All references to “psi” throughout this Standard are to be considered gauge pressures, unless otherwise specified.

1.5

Clause 7, Items unique to the United States, contains provisions that are unique to the United States.

1.6

Clause 8, Items unique to Canada, contains provisions that are unique to Canada.

1.7

This Standard also applies to appliances with draft hoods that are factory-equipped with automatic vent damper devices (see Clause 3, Definitions), hereinafter referred to as vent damper devices.

1.8

Special construction provisions applicable to vented gas fireplace heaters designed for use with an optional design-certified conversion kit are outlined under Annex B, Provisions for listed gas appliance conversion kits (optional).

1.9

Clause 2, Reference publications, contains a list of standards specifically referenced in this Standard and sources from which they may be obtained.

1.10

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user shall satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

Categories: Energy
Contact: lorraine.mccourt@csagroup.org
Origin:
Close date: Apr 7, 2017
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1 Scope

1.1

This Standard applies to newly produced vented decorative gas appliances (see Clause 3, Definitions), hereinafter referred to as appliances, constructed entirely of new, unused parts and materials and having input ratings up to and including 400,000 Btu/hr (117 228 W).

These appliances are for:

a)  use with natural gas;

b)  use with propane;

c) direct vent gas appliances for manufactured home (USA only) or mobile home OEM installation or aftermarket installation convertible for use with natural gas and propane gas when provision is made for the simple conversion from one gas to the other (see Clauses 4.1.22 and 4.1.23);

d) direct vent gas appliances for manufactured home (USA only) or mobile home aftermarket installation for use with natural gas only or propane gas only (see Clause 4.1.23); and

e) direct vent gas appliances for manufactured home (USA only) or mobile home OEM installation for use with propane gas only (see Clause 4.1.22).

The construction of vented decorative gas appliances for use with the above mentioned gases is covered under Clause 4, Construction.

The performance of vented decorative gas appliances for use with the above mentioned gases is covered under Clause 5, Performance.

1.2

These appliances are not:

a) for use with a thermostat;

b) a source of heat; and

c) for use with solid fuels.

Δ 1.3

Annex H, Automatic intermittent pilot ignition systems and on demand pilot ignition systems for field installation, includes provisions for newly produced (optional) automatic intermittent pilot ignition systems and on demand pilot ignition systems (see Clause 3, Definitions), constructed entirely of new, unused parts and materials to be adapted in the field to an appliance equipped with an existing continuous pilot burner and which have been examined and tested for compliance with this Standard when installed on the appliance.

1.4

If a value for measurement given in this Standard is followed by an equivalent value in other units; the first stated value is the specification.

1.5

Clause 2, Reference publications, contains a list of standards specifically referenced in this Standard and sources from which they may be obtained. It is the responsibility of the user of this Standard to determine which referenced standard applies based on the requirements of the Authority Having Jurisdiction (AHJ) for the location of installation.

1.6

This Standard also applies to appliances with draft hoods that are factory equipped with automatic vent damper devices (see Clause 3, Definitions), hereinafter referred to as vent damper devices.

Δ 1.7

This Standard does not cover appliances equipped with continuous ignition sources.

1.8

All references to “psi” throughout this Standard are to be considered gauge pressure unless otherwise specified.

1.9

Special construction provisions applicable to vented decorative gas appliances designed for use with an optional design-certified conversion kit are outlined under Annex A, Provisions for listed gas appliance conversion kits (optional).

1.10

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user shall satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

Categories: Energy
Contact: sara.marxen@csagroup.org
Origin: CSA
Close date: Apr 9, 2017
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This Standard details the performance requirements for temperature compensation control used to prevent compressed natural gas (CNG) dispensing systems from exceeding a safe fill level of vehicle fuel storage container(s).

Categories: Energy
Contact: robert.reipas@csagroup.org
Origin: CSA
Close date: May 1, 2017
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1 Scope

1.1 

This Standard defines requirements for the periodic inspection of balance of plant pressure retaining systems, components, and supports that form part of a CANDU nuclear power plant using a risk informed in-service inspection (RI-ISI) methodology. Periodic inspection (see Annex A for additional guidance) is considered to include the fluid boundary portions of balance of plant systems, components and piping, including their supports that comprise a complete nuclear power plant, excluding the following systems or portions thereof:

a) Systems, and systems connected thereto, containing the fluid that, under normal conditions, directly transports heat from nuclear fuel, and other systems whose failure can result in a significant release of radioactive substances.

Note: These systems or portions of systems are subject to inspection in accordance with Clause 3.3.1(a) in CSA N285.4.

 

b) Systems essential for the safe shutdown of the reactor and/or the safe cooling of the nuclear fuel in the event of a process system failure.

Note: These systems or portions of systems are subject to inspection in accordance with Clause 3.3.1(b) in CSA N285.4.

 

Compressors, turbines, generators, engines, and hydraulic or pneumatic cylinders are exempt from the inspection requirements of this Standard. This includes piping internal to equipment or mounted upon equipment that carries fluid from one chamber to another on the same foundation.

Note: To arrive at a periodic inspection program, the user should consider the inspections, examinations, and tests performed by other programs such as pipe wall thinning, vessel inspections, equipment reliability, and maintenance programs in addition to RI-ISI. Inspections performed as part of supporting programs are not expected to be repeated in this periodic inspection program, but should be credited to this periodic inspection program to provide assurance that the program satisfies the intended purpose as described in Annex A.

1.2 

This Standard addresses the following requirements

a) failure aspects;

b) classification of areas subject to inspection;

c) provision for access;

d) inspection techniques and procedures;

e) personnel qualifications;

f) frequency of inspection;

g) responsibilities;

h) documentation;

i) records;

j) evaluation of inspection results;

k) dispositioning; and

l) repair, replacement and modification requirements.

1.3 

The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.

1.4 

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (nonmandatory) to define their application.

Categories: Energy
Contact: robert.reipas@csagroup.org
Origin: CSA
Close date: May 2, 2017
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This is a proposed amendment to N293-12 - Fire protection for nuclear power plants

Categories: Energy
Contact: tony.wong@csagroup.org
Origin: CSA
Close date: May 2, 2017
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1. Scope

1.1

This Standard applies only to electrically driven, mechanical, vapour-compression-type systems.

Large air conditioners and heat pumps rated above 19 kW (65 000 Btu/h) cooling or heating capacity at standard rating conditions for both single- and three-phase electrical power supplies

 All sizes of single packaged vertical air conditioners and heat pumps and air-conditioning condensing units.

 

Note: See Tables1 to 3 for classifications of air conditioners, heat pumps, and air-conditioning condensing units.

 

1.2

In CSA Standards, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; “may” is used to express an option or that which is permissible within the limits of the standard; and “can” is used to express possibility or capability. Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material. Notes to tables and figures are considered part of the table or figure and may be written as requirements. Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application

1.3

The values given in SI (metric) units are the standard. The values given in parentheses are for information only.

Categories: Energy
Contact: lorraine.mccourt@csagroup.org
Origin:
Close date: May 15, 2017
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1 Scope

1.1 

This Standard applies to newly produced outdoor cooking gas appliances (see Clause 3) constructed entirely of new, unused parts and materials. Outdoor cooking gas appliances submitted for examination under this Standard are classified as portable, stationary, or built-in.

1.2 

This Standard applies to outdoor cooking gas appliances mounted to the exterior of a recreational vehicle (RV grills) (see Clause 3) for connection to the recreational vehicle's low pressure LP gas supply system (see Clause 1.8). It does not apply to outdoor cooking gas appliances for installation in the interior living space of a recreational vehicle.

1.3 

This Standard does not apply to outdoor cooking gas appliances for installation in or on boats.

1.4 

An outdoor cooking gas appliance may be a:

a) broiler unit;

b) top or surface unit;

c) oven;

d) combination of (a), (b) or (c) above, or any other outdoor cooking gas appliance; or

e) RV grill.

1.5 

Ovens shall not be of the self-cleaning type (see Clause 3).

1.6 

Outdoor cooking gas appliances may be for connection to:

a) a fixed fuel piping system.

b) a remote self-contained liquefied petroleum gas supply system (see Clause 3, Definitions), provided the appliance is supplied with remote mounting and retention means for the attachment of a single cylinder with a maximum size in accordance with Clause 1.6(b) or Clause 4.4.4(c) and instructions for installing the mounting and retention means within the built-in enclosure.

c) a self-contained liquefied petroleum gas supply system with an integral cylinder mounting means, for attachment to a single cylinder:

i) outdoor cooking gas appliances with input ratings less than 80,000 Btu/h shall be designed to accommodate a vertically mounted cylinder with a maximum size of 20 lb (9.1kg) of fuel.

ii) outdoor cooking gas appliances with input rating greater than or equal to 80,000 Btu/h shall be designed to accommodate a vertically mounted cylinder with a maximum size of 30 lb (13.6 kg) of fuel.

 

d) a self-contained liquefied petroleum gas supply system with an integral cylinder mounting means for the attachment of not more than two vertically mounted vapor withdrawal cylinders, each with a maximum size of 20 lb (9.1 kg) of fuel for outdoor cooking gas appliances with input ratings greater than or equal to 80,000 Btu/hr.

1.7 

This Standard applies to outdoor cooking gas appliances operating at inlet gas pressures not to exceed 1/2 psi (3.5 kPa) for connection to a fixed fuel piping system for use with:

a) natural gas;

b) manufactured gas;

c) mixed gas;

d) liquefied petroleum gases; and

e) LP gas-air mixtures.

This Standard also applies to outdoor cooking gas appliances designed for connection to self-contained LP gas supply systems (see Clause 4.5) operating at regulated outlet pressures:

a) not to exceed 11 in wc (2.74 kPa); and

b) in excess of 11 in wc (2.74 kPa) but not greater than 5 psi (34.5 kPa).

The construction of outdoor cooking gas appliances for use with the above-mentioned gases is covered under Clause 4, Construction.

The performance of outdoor cooking gas appliances for use with the above-mentioned gases is covered under Clause 5, Performance.

1.8 

Built-in outdoor cooking gas appliances may be for connection to:

a) a fixed fuel piping system; or

b) a remote self-contained liquefied petroleum gas supply system (see Clause 3, Definitions), provided the appliance is supplied with remote mounting and retention means for the attachment of a single cylinder with a maximum size in accordance with Clause 1.6(b) and instructions for installing the mounting and retention means within the built-in enclosure.

1.9 

An outdoor cooking gas appliance conforming to Clause 1.6(c)(ii), and that is capable of accepting either a 20 lb (9.1 kg) or a 30 lb (13.6 kg) LP gas cylinder, shall have all applicable tests in Clause 4 and Clause 5 conducted with both size cylinders.

1.10 

An outdoor cooking gas appliance having integral mounting and retention means shall be designed so a spare 20 lb (9.1 kg) or 30 lb (13.6kg) LP gas cylinder cannot be stored within any enclosure, or under the firebox of the appliance.

1.11 

Throughout this document gage pressures are designated in pounds per square inch, (psi) and kilopascals (kPa). Use of the terminology “psig” is not used. Where “psi” is used it is understood to be pound per square inch gage. Absolute pressures are not used in this Standard.

1.12 

This Standard contains SI (Metric) equivalents to the yard/pound quantities, the purpose being to allow the Standard to be used in SI (Metric) units. (IEEE/ASTM SI 10, American National Standard for Metric Practice, or ISO 80000-1:2009, Quantities and units – Part 1: General (Standard for use of the International System of Units (SI): The Modern Metric System, IEEE/ASTM SI 10 or ISO 80000-1:2009 Quantities and units - Part 1: General are is used as a guide in making metric conversion from yard/pound quantities.) If a value for a measurement and a corresponding value in other units are stated, the first stated value is to be regarded as the requirement. The given corresponding value may be approximate. If a value for a measurement and a corresponding value in other units are both specified as a quoted marking requirement, the first stated unit, or both shall are to be provided.

1.13 

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user shall satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

1.14 

Clause 7 contains provisions that are unique to the United States.

1.15 

Clause 8 contains provisions that are unique to Canada.

1.16 

Clause 2 contains a list of standards specifically referenced in this Standard and sources from which these reference standards may be obtained.

1.17 

An outdoor cooking gas appliance covered by this Standard need not comply with the provisions of the Standard for Gas-Fired Appliances for Outdoor Installations, CAN1-2.21.

Categories: Energy
Contact: tony.wong@csagroup.org
Origin: CSA
Close date: May 23, 2017
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1 Scope

1.1

This Standard applies to factory-manufactured residential, commercial, and industrial packaged terminal air-conditioners and heat pumps as defined in Clause 3.

1.2

This Standard applies to electrically operated vapour-compression refrigeration systems.

1.3

Packaged terminal air-conditioners and heat pumps are intended for unducted installation, but may be employed with ductwork having external static resistance up to 25 Pa (0.1 in H2O).

1.4

This Standard does not apply to the following:

a) heat-operated air-conditioning/heat pump equipment or room air-conditioners/heat pumps, as defined in CAN/CSA-C368.1;

b) water-to-air and brine-to-air heat pumps, as defined in CAN/CSA-C13256-1 and ISO 13256-1;

c) unitary air-conditioners and air-source unitary heat pumps, as defined in CAN/CSA-C656 and ANSI/AHRI 210/240, with capacities less than 19 000 W (65 000 Btu/h);

d) commercial and industrial unitary air-conditioners and heat pumps, as defined in CAN/CSA-C746 and ANSI/AHRI 340/360, with capacities of 19 000 W (65 000 Btu/h) or greater;

e) commercial and industrial single package vertical air-conditioners and heat pumps, as defined in ANSI/AHRI 390, with capacities of 39 300 W (134 000 Btu/h) or less; and

f) units with integral gas-fired heating.

1.5

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “should” is used to express a recommendation or that 

which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.

1.6

The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.