Siemens SIMATIC NET SCALANCE W1788 Series Operating Instructions Manual page 61

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Notes for use in hazardous locations according to ATEX, IECEx, UKEX and CCC Ex

If you use the device under ATEX, IECEx, UKEX or CCC Ex conditions you must also keep

to the following safety instructions in addition to the general safety instructions for

protection against explosion:

Transient overvoltages

Take measures to prevent transient overvoltages of more than 40% of the rated voltage

(or more than 119 V). This is guaranteed if you only operate the devices with SELV

(safety extra-low voltage) or PELV (protective extra low voltage).

Suitable cables at high ambient temperatures in hazardous area

At an ambient temperature of ≥ 60 °C, use heat-resistant cables designed for an

ambient temperature at least 20 °C higher. The cable entries used on the enclosure

must comply with the IP degree of protection required by EN IEC / IEC 60079-0, GB

3836.1.

General notes on use in hazardous areas according to UL-HazLoc

If you use the device under UL-HazLoc conditions, you must also adhere to the following

safety notices in addition to the general safety notices for protection against explosion:

WARNING - EXPLOSION HAZARD -

DO NOT DISCONNECT WHILE CIRCUIT IS LIVE UNLESS AREA IS KNOWN TO BE

NON-HAZARDOUS.

Restricted area of application

This equipment is suitable for use in Class I, Division 2, Groups A, B, C and D or non-

hazardous locations only.

Restricted area of application

This equipment is suitable for use in Class I, Zone 2, Group IIC or non-hazardous

locations only.

SCALANCE W1788-x / W1748-1

Operating Instructions, 03/2022, C79000-G8976-C484-05

WARNING

Connection

6.1 Safety when connecting up

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