Maintenance for Type 1 Sprinkler-resistant Enclosures

Water-Soaked MCCs

Do not clean or repair an MCC that has been exposed to large volumes of water or submerged at any time. Current-carrying parts, insulation systems, and electrical components may be damaged beyond repair. Do not energize the MCC. Contact Schneider Electric Services at 1-888-778-2733 (US), 55-5804-5000 (Mexico), or 1-800-565-6699 (Canada).

Water-sprayed or Splashed MCC (Clean Water Only)

DANGER
Hazard of Electric Shock, Explosion, or Arc Flash Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS, CSA Z462, or local equivalent. This equipment must only be installed and serviced by qualified electrical personnel. Turn off all power supplying this equipment before working on or inside equipment. Always use a properly rated voltage sensing device to confirm power is off. Replace all devices, doors, and covers before turning on power to this equipment. Failure to follow these instructions will result in death or serious injury.

DANGER

Hazard of Electric Shock, Explosion, or Arc Flash

Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS, CSA Z462, or local equivalent.
This equipment must only be installed and serviced by qualified electrical personnel.
Turn off all power supplying this equipment before working on or inside equipment.
Always use a properly rated voltage sensing device to confirm power is off.
Replace all devices, doors, and covers before turning on power to this equipment.

Failure to follow these instructions will result in death or serious injury.

If the MCC has been sprayed or splashed with small amounts of clean water, make a thorough inspection of the entire system, and verify that no damage to conductors or insulation has occurred. Do not open sealed devices such as molded case circuit breakers or fuses. Replace these devices if they are damaged. Refer to the appropriate instruction bulletin listed in MCC-related Literature.

Inspection and Cleanup of Clean Water Sprayed or Splashed MCC

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Follow steps 1–4 only if: No signs of physical damage to the equipment are present. The MCC has not been submerged or exposed to water for long periods of time. The water that has been in contact with the MCC has not been contaminated with sewage, chemicals, or other substances that can negatively affect the integrity of the electrical equipment. If any one or more of these conditions have not been met, do not energize the MCC. Contact Schneider Electric Services at 1-888-778-2733 (US), 55-5804-5000 (Mexico), or 1-800-565-6699 (Canada). Failure to follow these instructions will result in death or serious injury.

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

Follow steps 1–4 only if:

No signs of physical damage to the equipment are present.
The MCC has not been submerged or exposed to water for long periods of time.
The water that has been in contact with the MCC has not been contaminated with sewage, chemicals, or other substances that can negatively affect the integrity of the electrical equipment.

If any one or more of these conditions have not been met, do not energize the MCC. Contact Schneider Electric Services at 1-888-778-2733 (US), 55-5804-5000 (Mexico), or 1-800-565-6699 (Canada).

Failure to follow these instructions will result in death or serious injury.

If ALLof the conditions listed have been met, proceed as follows:

Test the MCC for insulation resistance as described in Insulation Test.
Record resistance values. Refer to the chart in Insulation Resistance.
If resistance measurements are:
- Less than one megohm, do not energize the MCC and contact Schneider Electric Services at 1-888-778-2733 (US), 55-5804-5000 (Mexico), or 1-800-565-6699 (Canada).
- Greater than one megohm, the equipment can be energized using the procedures listed in Energizing the MCC.