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SEMI S2-0703a E © SEMI 1991, 2004 75 RELATED INFORMATION 12 LIGHT TOWER COLOR AND AUDIBLE ALERT CODES NOTICE : This rel ated information i s not an of ficial part of SEMI S2 and was de rived from practical application by…

SEMI S2-0703a

RELATED INFORMATION 11

OTHER REQUIREMENTS BY REGION OF USE

NOTICE: This related information is not an official part of SEMI S2 and was derived from practical application by

task force members. This related information was approved for publication by vote of the responsible committee on

October 21, 1999.

R11-1 Japan — Earth Leakage Breaker/Ground

Fault Circuit Interrupter/Ground Fault

Equipment Protection Circuit Interrupter/

Residual Current Devices

R11-1.1 Japanese regulations may require the use of

Ground Fault Circuit Interrupter (GFCI), Ground Fault

Equipment Protection Circuit Interrupter (GFEPCI),

Residual Current Devices (RCD), or Earth Leakage

Breaker (ELB) with the equipment.

EXCEPTION 1: The rating of the equipment is less

than 20 amperes and less than 150 volts rms.

EXCEPTION 2: The equipment is supplied from the

ungrounded secondary of an AC mains isolation

transformer.

R11-1.2 The GFCI, GFEPCI, RCD or ELB, when

required to satisfy Japanese requirements, should have

trip ratings of not greater than 30 mA and 0.1 second.

EXCEPTION 1: If there is no accessible live circuit

during maintenance tasks, trip ratings of up to 300 mA

are acceptable.

EXCEPTION 2: If the equipment satisfies Exception 1

and the earth impedance is less than 50 ohms, a GFCI,

GFEPCI, RCD or ELB of 500 mA maximum is

acceptable.

EXCEPTION 3: If the equipment is connected to a

source of supply that is provided with a GFCI,

GFEPCI, RCD or ELB, an additional GFCI, GFEPCI,

RCD or ELB is not required for the equipment.

R11-2 USA

R11-2.1 Nameplates — In addition to the nameplate

requirement noted in the Electrical section of S2,

equipment evaluated as “Industrial Machinery” per

NFPA 79 and intended for use in the United States may

be required to display additional nameplate

information, such as ampere rating of the largest motor

or load, short circuit interrupting capacity of the

machine overcurrent protective device where furnished

as part of the equipment, and the electrical diagram

number(s) or the number of the index to the electrical

diagrams. Furthermore, where overcurrent protection is

provided, the equipment must be marked “overcurrent

protection provided at machine supply terminals.”

R11-2.1 Hazard Communication — Federal

government OSHA regulations, found in 29 CFR

1910.1200, establish various requirements for labeling

of containers of hazardous chemicals and providing

Material Safety Data Sheets.

R11-3 Europe

R11-3.1 Nameplates — In addition to the nameplate

requirement noted in the Electrical section of S2,

equipment evaluated as “Industrial Machinery” per IEC

60204-1 (EN 60204-1) and intended for use in Europe

may be required to display additional nameplate

information, such as: certification mark, where

required; current rating of the largest motor or load;

short-circuit interrupting capacity of the machine

overcurrent protective device, where furnished as part

of the equipment; and the electrical diagram number(s)

or the number of the index to the electrical drawings.

R11-3.1.1 Where only a single motor controller is

used, this information may instead be provided on the

machine nameplate where it is plainly visible.

R11-3.1.2 The full-load current shown on the

nameplate shall be not less than the combined full-load

currents for all motors and other equipment that can be

in operation at the same time under normal conditions

of use. Where unusual loads or duty cycles require

oversized conductors, the required capacity shall be

included in the full-load current specified on the

nameplate.

R11-3.2 European Union requires compliance to CE

marking.

R11-4 Worldwide — Hazard Alert Labels

R11-4.1 USA — Labels intended for use in the USA

should conform to ANSI Z535.4.

R11-4.2 Other Countries — Labels intended for use in

countries other than the USA should conform to ISO

3864.

SEMI S2-0703a

RELATED INFORMATION 12

LIGHT TOWER COLOR AND AUDIBLE ALERT CODES

NOTICE: This related information is not an official part of SEMI S2 and was derived from practical application by

task force members. This related information was approved for publication by vote of the responsible committee on

October 21, 1999.

R12-1 Colors for Light Towers

R12-1.1 Where used for safety, a light tower should have the following characteristics:

Table R12-1 Light Tower Color Code

Color Explanation Examples

Red Hazardous, dangerous or abnormal

condition requiring immediate

attention

Pressure/temperature out of safe limits;

Voltage drop; Breakdown

Overtravel of a stop position

Indication that a protective device has stopped the machine, e.g.,

overload

Yellow Abnormal, caution/marginal condition;

Change or impending change of

critical condition requiring monitoring

and/or intervention (e.g., by re-

establishing the intended function)

Pressure/temperature exceeding normal limits

Tripping of protective device Automatic cycle or motors running; some

value (pressure, temperature) is approaching its permissible limit.

Ground fault indication. Overload that is permitted for a limited time.

Green Normal condition; machine ready Pressure/temperature within normal limits

Indication of safe condition or authorization to proceed. Machine ready

for operation with all conditions normal or cycle complete and machine

ready to be restarted.

R12-2 Audible Alert (Buzzer) Code

R12-2.1 Where used for safety, audible alert (buzzer) for the light tower should have the following characteristics:

Table R12-2 Light Tower Buzzer Code

Color Audible Alert (Buzzer)

Red Continuous

Yellow Intermittent

Green Intermittent/no sound (selectable)

SEMI S2-0703a

RELATED INFORMATION 13

SURFACE TEMPERATURE DOCUMENTATION

NOTICE: This related information is not an official part of SEMI S2 and was derived from practical application by

task force members. This related information was approved for publication by vote of the responsible committee on

October 21, 1999.

The following is some of the research leading to the

values in Table 1 in Section 18 of this guideline.

R13-1 The proposed Hazardous Temperature Limits

were derived from UL1950

and IEC950

by adding

ambient temperature (25°C) to the maximum

temperature rise allowed for external parts of

information technology equipment. Because several

SEMI members have questioned whether these limits

might subject operators and maintenance personnel to

contact with potentially hazardous temperatures, a

review has been done of several other sources of

suggested temperature limits.

R13-2 The proposed hazardous surface temperatures

for handling and touching of metal handles, knobs, etc.,

for brief periods in normal use is 60°C. Assuming a

brief handling time to be 5 seconds or less, this limit is

supported in MIL-STD-1472

, MIL-HDBK-759A

and EN563

(which are the same or more conservative

by 2°C), and is equal to the pain and tissue damage

threshold listed in the Human Factors Design

Handbook

. Thus, this temperature limit seems

appropriate for momentary (five seconds or less)

contact with uncoated metal handles, knobs, etc., and

other material with high thermal conductivity.

R13-3 The proposed hazardous surface temperatures

for handling and touching of glass/porcelain handles,

knobs, etc., for brief periods in normal use is 70°C.

This temperature limit is supported by MIL-STD-1472

and EN563. MIL-HDBK-759 is not applicable because

it must be assumed that it applies only to material with

high thermal conductivity.

R13-4 The proposed hazardous surface temperatures for

handling and touching of plastic/rubber handles, knobs,

etc., for brief periods in normal use is 85°C. This

12 UL 1950, Safety of Information Technology Equipment, 1989

(Underwriters Laboratory Standard).

13 IEC 950, Safety of Information Technology Equipment, 1986

(International Electrotechnical Commission Standard).

14 MIL-STD-1472D, Human Engineering Design Criteria for

Military Systems, Equipment & Facilities (Military Standard).

15 MIL-HDBK-759A, Handbook for Human Engineering Design

Guidelines, 1981 (Military Handbook).

16 EN 563, Safety of Machinery – Temperatures of Touchable

Surfaces, 1994 (European Normative Standard).

17 Human Factors Design Handbook, Second Edition, Woodson,

Tillman & Tillman, 1992 (Reference).

temperature limit is similarly supported by MIL-STD-

1472 and EN563. MIL-HDBK-759 is not applicable.

R13-5 The proposed hazardous surface temperatures

for continuous handling and touching of metal handles,

knobs, etc., during normal usage is 55°C. It is

suggested, based on observations of semiconductor

equipment in use, that a continuous handling time of

one minute be used. With this duration, the limit of the

MIL-STD and the MIL-HDBK ranges from 49 to 52°C.

The EN563 burn threshold limit for contact with metal

for one minute is 51°C. The burning heat pain level

listed in the Human Factors Design Handbook is 49°C

(no time frame given; assume high thermal conductivity

material). Thus, the proposed temperature limit appears

to be somewhat high for reasonably foreseeable

extended handling contact with uncoated metal handles,

knobs, etc., and other material with high thermal

conductivity. The Section 18 Table 1 limit is 51°C,

which might be somewhat painful to more sensitive

personnel, but should not result in tissue damage.

R13-6 The proposed hazardous surface temperatures

for extended handling and touching of glass/porcelain

handles, knobs, etc., during normal usage (again

assuming 1 minute) is 65°C. The limit of MIL-STD-

1472D is 59°C for “prolonged contact” with glass. The

EN563 burn threshold limit at 1 minute is 56°C. Thus,

the proposed temperature limit appears to be slightly

high for reasonably foreseeable extended handling

contact with glass/porcelain surfaces of moderate

thermal conductivity. The Section 18 Table 1 limit is

56°C, which is the more conservative of the

recommendations. This limit could be raised based

upon the results of the risk assessment for actual and

foreseeable normal usage.

R13-7 Similarly, the proposed hazardous surface

temperatures for extended handling and touching of

plastic/rubber handles, knobs, etc., during normal usage

(again assuming 1 minute) is 75°C. The limit of MIL-

STD-1472D is 69°C for “prolonged contact” with

plastic. The EN563 burn threshold limit at 1 minute is

60°C. Thus, the proposed temperature limit again

appears to be slightly high for reasonably foreseeable

extended handling contact with plastic/rubber surfaces

of low thermal conductivity. The Section 18 Table 1

limit is 60°C, which is the more conservative of the

recommendations. This limit could be raised based